She most likely works as a health psychologist because she combines resistance training with cardio exercise (jogging, swimming, and bicycling) (moderate weightlifting).
Can physical activity lessen heart attacks?A healthy heart is mostly dependent on physical activity. It's one of your best tools for building up your heart muscle, controlling your weight, and defending your arteries against damage brought on by high blood pressure, blood sugar, and cholesterol that can result in a heart attack or stroke.
Which activity is most beneficial for mental health?Aerobic exercise, such as jogging, swimming, cycling, walking, gardening, and dancing, has been shown to lessen anxiety and depression.
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which of the following options correctly describes how straight-chain alkanes are named? multiple choice question. alkanes are named with the root based on the number of carbon atoms followed by the suffix -ane. alkanes are named with the number of carbon and hydrogen atoms followed by the suffix -ane. alkanes are not named according to the greek prefixes. alkanes are named with the root based on the number of hydrogen atoms followed by the suffix -ane. alkanes are named with the root based on the number of atoms followed by -ide.
The straight-chain alkanes are named with the root based on the number of carbon atoms present in the alkane, followed by the suffix -ane.
Alkanes are types organic compounds, a series of hydrocarbon compounds, that consist of single-bonded carbon and hydrogen atoms. These are known as saturated hydrocarbons. The formula for Alkanes is CnH2n+2, and are subdivided into three groups, namely - chain alkanes, cycloalkanes, and the branched alkanes.
Alkanes are the simplest series or family of hydrocarbons. They contain only carbon and hydrogen in simplest form. Each carbon atom forms four bonds (either with another carbon atom or a hydrogen atom) and each hydrogen atom forms one bond i.e. with a carbon atom.
Straight-chain alkanes or simply chain alkanes are named by using a stem/root that indicates the number of carbon atoms present in the alkane (meth = 1 C, eth = 2 C's, prop = 3 C's, etc.) to which is added the suffix -ane, indicating that the molecule is indeed an alkane (that is, that the carbon atoms are all connected by single bonds).
Thus first option is the answer to the question.
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pH and pOH Formulas
pH = -log[H3O+]
pOH = -log[OH−]
pH + pOH = 14.00
Concentration Formulas
[H3O+] = 10-pH
[OH−] = 10-pOH
[H3O+][OH−] = 1.0 × 10-14
Round your answer to the nearest hundredth
A solution has a hydronium concentration of 4.7 × 10-11. What is the pH of the solution?
The pH of the solution as we can see is 10.3 from the calculations here.
What is the pH of the solution?We can see that the question does open with all the basic facts that we need to help us to solve the question and one of those is the definition that we know that the pH of the solution can be defined as the negative logarithm of the hydronium ion concentration of a solution.
Now we know that;
pH = -log[[tex]H_{3} O^+[/tex]]
Then we have from the question that;
[[tex]H_{3} O^+[/tex]] = 4.7 × 10-11
pH = -log(4.7 × 10-11)
pH = 10.3
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question at position 9 given a chemical reaction h2 o2 --> h2o. if you start with 4 g h2 and 40 g o2 and let the reaction go to completion, what mass of o2 left
40 g O2 - (4 g H2 x 4 g O2/2 g H2) = 32 g O2
Therefore, 32 g O2 mass is left after the reaction goes to completion.
What is mass?
Mass is a measure of the amount of matter in a given object. It is measured in kilograms (kg) or grams (g). Mass is related to weight, which is a measure of the force of gravity on an object. An object's mass remains the same regardless of its location, while its weight will vary depending on the strength of the gravitational pull in that location. Mass is an important concept in physics, as it is used to calculate many physical characteristics, such as force, acceleration, and energy.
Therefore, 32 g O2 mass is left after the reaction goes to completion.
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How many grams of CO2 are used when 8.50 g of O2 are produced?
So, in order for a Ceo to make carbon plus oxygen Gus, we must first formulate the mathematical formula for it. What does CO2 therefore equal? 8.5 g oh from there.
How many granules of CO2 are employed to make 6.5 grams of O2?Here, Bye Cyclorama four from 6.5g of 02 twice one mode of 021 per 32g of co, two from one mole of CO2 times 24.1 g of c 02 per one molecule of c 02, and three from one mole for 02 times 6.5g of 02 times 32g of co. As a result, this CO2 mask is equivalent to 8.9 grams of CO2. I'm grateful.
How is CO2 yield determined?The best approximate method to get your carbonated drink production facility's CO2 Yield is to divide the amount of carbonated beverages generated during the investigated time divided by the amount of CO2 that was consumed each month.
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The density of hexane is 0.66g/ml and the density of water is 1.00gml. A 1.0 g sample of i2 is added to the mixture which is shaken again. Which of the following best predicts happens to the i2?
The i2 will settle to the bottom of the mixture,of the following best predicts happens to the i2.
What is the mixture?
The mixture is a combination of ingredients that are blended together to create a unique and distinct product. It can be anything from a cake batter to a marinade, a salad dressing to a bread dough. Mixtures often include multiple components that work together to produce the desired outcome. Plagiarism-free mixtures are created when each ingredient is carefully selected and all sources are properly cited. By using original ingredients, a mixture can be created that is both unique and delicious.
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Buffer solutions containing Na2CO3 and NaHCO3 range in pH from 10.0 to 11.0. The chemical equation below represents the equilibrium between CO32−and H2O, and the table lists the composition of four different buffer solutions at 25°C.
Which of the following chemical equilibrium equations best shows what happens in the buffer solutions to minimize the change in pH when a small amount of a strong base is added?
answer choices
H3O+(aq) + OH−(aq) ⇄ 2 H2O(l)
HCO3−(aq)+ OH−(aq) ⇄ CO32−(aq) + H2O(l)
CO32−(aq) + H3O+(aq) ⇄ HCO3−(aq) +H2O(l)
CO32−(aq) + H2O(l) ⇄ HCO3−(aq)+ OH−(aq)
B. HCO3−(aq)+OH−(aq)⇄CO32−(aq)+H2O(l). Buffer solutions containing Na2CO3 and NaHCO3 range in pH from 10.0 to 11.0. The chemical equation below represents the equilibrium between.
CO32−and H2O, and the table lists the composition of four different buffer solutions at 25°C. A chemical equation is made up of reactants, products, and an arrow indicating the direction of the reaction. A balanced chemical equation is one in which the number of atoms in all molecules is equal on both sides of the equation. The law of conservation of mass is not applicable in the preceding case. A chemical equation is a graphical description of a chemical process using symbols and chemical formulae. The reactant entities are on the left, and the product entities are on the right, with a plus sign between the entities in both the reactants and the products, and an arrow pointing towards the products to indicate the reaction's direction. Chemical formulae might be symbolic, structural (pictorial), or both.
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Q: Determine the hardness of water sample prepared by dissolving 1.36 gram of CaCl2 in 500 ml distilled water.
The hardness of water sample prepared by dissolving 1.36 gram of CaCl[tex]_2[/tex] in 500 ml distilled water is 0.00272 gram/ ml.
What is hardness of water?The quantity of dissolved magnesium and calcium in the water is the simplest way to define water hardness. Calcium and magnesium are the main dissolved minerals in hard water. The last time someone washed your hands, you could have really felt the impacts of hard water.
"Soap " is created in hard water when soap interacts with the water's comparatively high calcium content. More soap and detergent is required to be get things clean while using hard water, whether it's your hands, your hair, or your clothes.
hardness of CaCl[tex]_2[/tex]=mass of CaCl[tex]_2[/tex]/ volume of distilled water
= 1.36 gram÷500 ml
=0.00272 gram/ ml
Therefore, the hardness of water sample prepared by dissolving 1.36 gram of CaCl[tex]_2[/tex] in 500 ml distilled water is 0.00272 gram/ ml.
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if a certain metal is placed in an ionic solution containing another metal an no reaction occurs, then the metal originally in the solution is
a. a halogen
b. higher on the activity series
c. not on the activity series
d. unreactive
b. higher in the activity sequence. If a given metal is introduced in an ionic solution containing another metal and no reaction happens, the metal initially in the solution is returned to the solution.
Ionic solutions are ones that include ions in order to transmit electricity through them. An electrolyte disintegrates into ions when it dissolves in water. Electrolytes that degrade into ions can only conduct electricity when molten or liquid. This type of mole is usually large and is caused by a condition that affects melanocytes, or pigment-producing cells (melanin). Melanocytic nevi might seem rough, flat, or raised. They might be present from birth or develop later in adulthood. Melanocytic nevi can become cancerous in rare circumstances. The majority of cases do not warrant treatment, although The mole must be removed in specific instances. Moles (nevi) are a kind of skin growth that is rather common. Because of clusters of pigment-forming cells, they appear as minute, dark brown spots (melanocytes).
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Consider the heterogenous equilibrium,
H2 (g) + S(s)<==> H2S (g) + heat
At a given temperature for this reaction, Keq = 14.3. What are the equilibrium concentrations of H2(g) and H2S (g) . when 0.200 mol of hydrogen and 6.00 mol of hydrogen sulfide are allowed to react and reach equilibrium in a 2.00 L container.
At a particular temperature, H2(g)+I2(g)2HI(g) equals 64. H2 and HI have heterogenous equilibrium concentrations of 2 and 16 mollit-1, respectively.
How does the straightforward reaction 2NO g O2 g)= 2NO2 g) flow overall?Second order in NO and first order in O2 is the reaction 2NO(g) + O2(g) 2NO2(g). The observed rate of the reaction at [NO] = 0.8 M and [O2] = 3.7 M is 0.00022022 M/s.
What does the equilibrium constant Keq equal?The concentration of the reactants is high at equilibrium if Keq is a small number (Keq1). In this instance, the reaction is in favor of reactants forming. According to Keq 1, the reactants and products are present in significant quantities.
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the law of conservation of energy states that energy can not be created or destroyed but changed from one form to another. when gasoline is burned, the (mechanical, chemical, thermal) energy stored in the gas is converted to (mechanical, chemical, thermal) energy as the car moves and (mechanical, chemical, thermal) energy as it releases heat.
When car burns gasoline, it converts chemical energy into mechanical energy. This is according to the law of conservation of energy.
The law of conservation of energy states that energy is neither created nor destroyed. When people use energy that doesn't disappear. The Energy changes from one form of energy into another form of energy. A car engine burns gasoline. It converts the chemical energy in gasoline into mechanical energy. The mechanical energy is the sum of potential energy and kinetic energy. Energy changes form one into another but the total amount of energy in the universe stays the same. That means that a system always has the same amount of energy if it is not added from the outside.
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Platelet dense granules are storage organelles for which the following that are released after activation?
a. Calcium, ADP, and serotonin
b. Fibrinogen, glycoprotein Ib, and VWF
c. ADP, thromboxane A2, and FV
d. Lysosomal granules, ATP, and FVIII
Platelet dense granules are storage organelles for which the substances released after activation is ADP, thromboxane A2, and FV.
Blood platelets are incredibly well-organized cells with a variety of organelles. Different sorts of components, some of which are at high concentrations, are stored in three distinct granule populations. Thus, platelets move some particular substances throughout the entire body. In the course of circulation, platelets respond to diverse stimuli and release the substances kept in the particular granules. A crucial stage of initial hemostasis is the "releasing reaction." Mitochondrial energy and the dense tubular system's messengers, which are needed for platelet reactivity, are delivered by these structures. Regarding the composition and function of the released elements, each granule population has unique characteristics. Small non-protein molecules are secreted by dense granules in order to draw in additional platelets. Large sticky and healing proteins are found in alpha-Granules.
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Which of the following affect the amount by which the freezing point of liquid is lowered by the addition of a solute? More than one answer may be correct.
A. Whether or not the compound is ionic.
B. How soluble the solute is in the solvent.
C. The volume of the solvent.
D. The value of the freezing point for the pure solvent.
E. The identity of the chemical species being dissolved.
The options that affect the amount that the freezing point is lowered by the addition of the solute include :
A. Whether or not the compound is ionic.B. How soluble the solute is in the solvent.How can solutes affect the freezing point of liquids ?The increasing of a solvent's boiling point as a result of the addition of a solute is known as boiling point elevation. Similar to freezing point depression, adding a solute lowers the freezing point of a solvent. In actuality, a solvent's freezing point drops as its boiling point rises.
Any solvent's freezing point will be lowered by the presence of a solute; this action is known as freezing-point depression. The fact that the solute is present in the liquid solution but not in the pure solid solvent is crucial to understanding this phenomenon.
This includes the compound being ionic or the solubility of the solvent.
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fiber inhibits intestinal absorption of various substances, including lead, which can then be secreted in the feces.
YES. The sentence in question is correct that fiber inhibits intestinal absorption of various substances, including lead, which can then be secreted in the feces.
Fibers are types of carbohydrates that the body cannot digest itself. Though most of the carbohydrates we intake are broken down into sugar molecules called glucose, fibers cannot be broken down into simpler sugar molecules, and instead they pass through the body undigested. Fibers help regulate the body’s use of sugars, helping by keeping hunger and blood sugar in check.
Soluble fiber attracts water present in the gut, forming a gel-like substance, which can slow digestion. This, in turn, may help prevent blood glucose surges after food intake and may reduce hunger. Control of blood glucose and weight is important for health because these are two of the main risk factors for diabetes, a condition which doubles the risk of developing a heart disease.
Eating lots of fiber, iron and especially thiamine-rich foods may induce/help in rapid removal and excretion of the lead from the body tissues. Thus fiber as in part of diet, plays an important role in digestion and intestinal absorption.
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The complete question should be:
Fiber inhibits intestinal absorption of various substances, including lead, which can then be secreted in the feces. True or False?
______ results in a decrease in the number of c-z bonds, where z is an element that is more electronegative than carbon (usually o, n, or x).
The number of c-z bonds decreases as a result of oxidation, where z is a more electronegative element than carbon.
What is oxidation?In this case, oxidation refers to the decrease of C-H bonds or the increase of carbon to other elements (more electronegative) bonds, most commonly oxygen, rather than the increase in the oxidation number of the carbon atom.The number of C-Z bonds (where Z = O, N, or X denotes halogen) is determined by the valence electron present in Z. Covalent bonds exist primarily between carbon (c) and other atoms. To generate a covalent bond, an equal share of electrons is required for the sigma bond, and a vacant or partially filled p-orbital is required for the pi bond.This is a single covalent bond in which carbon shares its outer valence electrons with up to four hydrogens.To learn more about oxidation refer to :
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Krypton is a noble gas with several stable isotopes. Which of the following combinations of mass number (represented here as A) and neutrons (n) are possible as isotopes of krypton? Select all that apply. O A = 83, n = 47 O A = 82, n = 46 O A = 80, n = 36 O A = 84, n = 48 O A = 86, n = 49
The element krypton is a noble gas, meaning it is chemically inert and does not typically react with other elements.
What do you mean by noble gas?
Noble gases are a group of chemical elements in the periodic table that have very low reactivity and stable properties. They have eight valence electrons in their outermost electron shell, which makes them very stable and unreactive. The six noble gases are helium, neon, argon, krypton, xenon, and radon.
a. A=82, n=46
b. A=84, n=48
e. A=83, n=47
We can calculate the number of protons in the above options by subtracting the number of neutrons from the mass number. Kr has an atomic number of 36. As a result, the isotopes listed above are correct. These are the isotopes Kr-82, Kr-83, and Kr-84.
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Which of the following units are used to measure heat? Select all that apply.
The units used to measure heat are:1 - kilocalories, 3 - joules, 4 - Kelvin, and 6 - calories
Kilocalories and calories are units of energy, often used to express the energy content of foods. Joules is the SI unit of energy, often used to express the amount of heat energy. Kelvin is the SI unit of thermodynamic temperature, often used in scientific and technical applications.
Celsius and Fahrenheit are units of temperature, but not heat. Heat is defined as the energy relocated from one body to another as a consequence of a temperature difference. So temperature is related to heat but it doesn't measure heat.
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The complete question is :
Heat is measured using which of the following units? Select all that apply.
1 - kilocalories
2 - Celsius
3 - joules
4 - Kelvin
5 - Fahrenheit
6 - calories
Use Lagrange multipliers to find the maximum and minimum values of the function subject to the given constraint. (If a value does not exist, enter NONE.) f(x, y z) = x^4 y^4 z^4; x^4 + y^4 + z^4 = 1
To use Lagrange multipliers, we need to find the partial derivatives of the function with respect to each variable and set them equal to a Lagrange multiplier times the partial derivative of the constraint with respect to that variable.
How to find the maximum and minimum values using Lagrange multipliers?The partial derivatives of the function are:
∂f/∂x = 4x^3y^4z^4
∂f/∂y = 4x^4y^3z^4
∂f/∂z = 4x^4y^4z^3
The partial derivative of the constraint with respect to each variable is simply:
∂g/∂x = 4x^3
∂g/∂y = 4y^3
∂g/∂z = 4z^3
Now we can set up the system of equations:
4x^3y^4z^4 = λ * 4x^3
4x^4y^3z^4 = λ * 4y^3
4x^4y^4z^3 = λ * 4z^3
x^4 + y^4 + z^4 = 1
Solving for x, y, and z in terms of λ:
x = (λ/4)^(1/3)
y = (λ/4)^(1/3)
z = (λ/4)^(1/3)
Substituting these values back into the constraint equation:
(λ/4)^(4/3) + (λ/4)^(4/3) + (λ/4)^(4/3) = 1
Simplifying:
3(λ/4)^(4/3) = 1
λ^(4/3) = 4/3
λ = (4/3)^(3/4)
Now we can substitute this value of λ back into the expressions for x, y, and z:
x = (4/3)^(1/4)
y = (4/3)^(1/4)
z = (4/3)^(1/4)
Finally, we can substitute these values back into the original function to find the maximum and minimum values:
f(x, y, z) = (4/3)^(4/4) = 4/3 (maximum value)
Note that since this is a maximum value, and since the constraint is an equality, there is no minimum value. So, the minimum value is NONE
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question 3 is unpinned. click to pin. question at position 3 when 1,2-dibromo-1-phenylethane is heated with sodium hydroxide, a compound with the ir spectrum provided is produced. propose a structure for this product.
Proposed Structure is CH3CHBrCH2Br + NaOH → CH3CH(OH)CH2Br
Heating of 1,2-dibromo-1-phenylethane and NAOHWhen the sodium hydroxide is heated, 1,2-dibromo-1-phenylethane undergoes a nucleophilic substitution process to produce 1-phenylethyl sodium bromide. Sodium bromide and 1-phenylethane are the results of the process, and they are both isolable. An S N 1 mechanism, involving the creation of a carbocation intermediate, underlies the reaction. The intermediate is attacked by the nucleophile, in this case sodium hydroxide, who then produces the end result. In order to turn alkyl halides into alkanes, this reaction is frequently utilized. Additionally serving as a base in the process, sodium hydroxide aids in deprotonating the alkyl halide, which permits the reaction to proceed.
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Write a paragraph about chemical reactions in everyday life, that cause pollution of the environment.
Pollutants of many different forms enter the environment as a result of chemical interactions in daily living. Significant soil pollution has been brought on by mining, agriculture, and waste disposal.
What is chemical pollution?Chemical pollution is the act of contaminating the environment with chemicals that do not occur naturally.
The delicate ecosystems of the Earth's surface can be harmed by chemical pollution. Biodiversity and population food production are both impacted by soil health. Marine biodiversity has also been impacted by high or prolonged chemical exposure
Biodiversity: What is it?The diversity of animals, plants, fungi, and even microbes like bacteria that make up our ecological landscape are all included in what is known as biodiversity.
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which of the following processes can be accompanied by carbocation rearrangements? neither ozonolysis nor alkylation of an alkyne only alkylation of an alkyne both ozonolysis and alkylation of an alkyne only ozonolysis
Both ozonolysis and alkylation of an alkyne only ozonolysis processes can be accompanied by carbocation.
How do you explain the carbocation?A molecule called a carbocation has three bonds and a positively charged carbon atom. They are essentially carbon cations, to put it simply. It was once referred to as carbonium ion. Any even-electron cation with a sizable positive charge on the carbon atom is now referred to as a carbocation.An ion having a carbon atom that is positively charged is called a carbocation. The methenium CH⁺ ₃, methanium CH⁺ ₅ and vinyl C ₂H⁺ ₃ cationsare a few of the more straightforward examples. Carbocations with several positively charged carbon atoms are also occasionally found.All carbon atoms in carbocations, also referred to as carbonium ions, are positively charged. A cation is a positive ion, and the "carbo" part of the term refers to an atom of carbon.Learn more about carbocation refer to :
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match the following. 1 . homogeneous a mixture that does not have a uniform composition and the individual components remain distinct. 2 . nonpolar a mixture that does have a uniform composition throughout and is always in the same state. 3 . unsaturated a substance that will not dissolve in a solvent. 4 . insoluble a homogeneous mixture 5 . polar a molecule with no internal charge variation due to bonding. 6 . heterogeneous a molecule with an uneven distribution of charge due to unequal sharing of electrons during bonding 7 . saturated a solution which has dissolved as much solute as it can at a particular temperature. 8 . solution a solution which is still able to dissolve solute.
A mixture is the combination of two more substances. There are two types of mixture : the heterogeneous mixture and the homogeneous mixture.
1) A mixture that does not have a uniform composition and the individual components remain distinct = heterogeneous mixture
2) A mixture that does have a uniform composition throughout and is always in the same state = homogeneous mixture
3) A substance that will not dissolve in a solvent = insoluble
4) homogeneous mixture = Solutions are made up of homogenous mixtures solute and solvent.
5) Molecule with no internal charge variation due to bonding = non - polar.
6) Heterogeneous a molecule with an uneven distribution of charge due to unequal sharing of electrons during bonding = polar
7) Saturated solution = . A solution which has dissolved as much solute as it can at a particular temperature.
8) Unsaturated = A solution which is still able to dissolve solute.
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orrectly arrange the steps in order for calculating the molecular mass of H,SO4. Place the first step at the top of the list. t Place these in the proper order. .008 amu) + (32.07 amu)+ (4 x 16.00 amu). The molecular mass of H2SO (2 x1 The molecular mass of H2SO4 98.09 amu. The molecular mass of H,so,-(2 x the atomic mass of H) + (the atomic mass of S) (4 x the atomic mass of o
The result of the molecular mass is 98.08 amu
What are the correct arrangement step in order for calculating the molecular mass?The molecular mass is the sum of the atomic masses of all the atoms in a molecule.It is typically measured in atomic mass units (amu) or daltons (Da).It can be calculated by adding together the atomic masses of each element present in the molecule.It is useful for characterizing and identifying different molecules.It can be used to determine the molar mass, which is used in stoichiometry calculations.And the steps are:Determine the atomic mass of H, S, and O.Multiply the atomic mass of O by 4.Add the atomic mass of S to the result from step 2.Multiply the atomic mass of H by 2.Add the atomic mass of H from step 4 to the result from step 3.The final result is the molecular mass of H2SO4, which is 98.09 amu.To learn more about molecular mass refer:
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2K3N + 3CaCl2 → 6KCl + Ca3N2
1 mol K3N = 131.301 g K3N
1 mol CaCl2 = 110.984 g CaCl2
1 mol KCl = 74.551 g KCl
1 mol Ca3N2 = 148.248 g Ca3N2
How many grams of CaCl2 would it take to make 1.5 moles of KCl?
a
54.213 g
b
83.238 g
c
166.476 g
d
110.984 g
To solve this we must be knowing each and every concept related to mole and and its calculations. Therefore, 83.17g is the grams of CaCl[tex]_2[/tex] would it take to make 1.5 moles of KCl. The correct option is option B.
What is mole?A mole is merely a measuring unit. In reality, it is one of International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.
Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading.
It's much easier to write' mole' than '6.02x10²³' whenever you wish to refer to a huge number of things. That is essentially why and how this particular component was created.
2K[tex]_3[/tex]N + 3CaCl[tex]_2[/tex] → 6KCl + Ca[tex]_3[/tex]N[tex]_2[/tex]
mole ratio between CaCl[tex]_2[/tex] and KCl is 1:2
2 mole of KCl requires 1 mole of CaCl[tex]_2[/tex]
1 mole of KCl requires 1/2 moles of CaCl[tex]_2[/tex]
1.5 moles of KCl requires (1/2)×1.5= 0.75 moles of CaCl[tex]_2[/tex]
mass of CaCl[tex]_2[/tex] = 0.75 moles ×110.9g/mol
= 83.17g
Therefore, 83.17g is the grams of CaCl[tex]_2[/tex] would it take to make 1.5 moles of KCl.
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What should you do if a fire starts in a beaker? question 18 options: O pour water on the fire. O wait and see if the fire goes out on its own. O cover the fire with a rag. O cover the mouth of the beaker with a watch glass.
If a fire starts in a beaker, the best option among the options provided to extinguish the fire is to cover the mouth of the beaker with a watch glass, hence the correct answer is the last option given.
For safety precautions and methods to be taken in a laboratory during any experiment or research is very important. Hence there are several ways safety hazards can be prevented or stopped.
For major fire hazards, security must be called to put out the fire in all scenarios. While for minor fires as like fire in a beaker, the hazard can be overcome by several easy cautious steps.
If we pour water in the beaker to stop the fire, that may cause the fire to be enhanced rather to be dissuaded, as if in presence of a reactive fuel, like magnesium (which could have been the cause of fire), the oxygen present in the water can cause combustion thus increasing the hazard. Hence first option is ruled out.
If we wait for the fire to go out on it's own, there are chances that the fire may come in contact with any inflammable item nearby which can enhance the fire further adding to the problem. Thus, this option is ruled out too.
Covering the fire with a rug is also not an efficient way to put out a fire in a beaker as a rug generally is very inflammable, and hence it would catch on fire easily, causing more difficult situations rather than a solution.
If we cover the mouth of the beaker with a watch glass, the fire would eventually go out as all the oxygen present in the beaker gets used for combustion. Covering the mouth of the beaker prevents any oxygen from outside to enter inside the beaker. Thus, this is a better option for the solution to the situation. Thus the answer to the question is the last option.
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Which of the statements about mole ratios are true? Select all that apply.
A. Mole ratios include coefficients from a balanced chemical equation.
B.
Mole ratios do not include stoichiometric coefficients.
C. Mole ratios can only be formed between two products.
D. Mole ratios can only be formed between two reactants.
E. Mole ratios can be formed between any combination of reactants and/or products.
F. Mole ratios always have reactants in the numerator and products in the denominator.
A and E are statements that can be considered to be true for mole ratio.
A. The amount of any two materials in moles in a chemical process is related by a ratio factor called a mole ratio. The claim that Mole ratios incorporate coefficients from a balanced chemical equation is hence true.
B. The number in front of atoms, ions, and molecules in a chemical process is the stoichiometric coefficient. Therefore, the claim that stoichiometric coefficients are not included in Mole ratios is incorrect.
C. It is possible for mole ratios to arise between two products or reactants. As a result, statement C is false.
D. It is untrue that mole ratios may only be created between two reactants, as stated in statement D.
E. The ratio of the moles of any two chemicals present in a reaction is known as the mole ratio. Consequently, it is accurate to say that Mole ratios can develop between any group of reactants and/or products.
F. There is a switchable numerator and denominator. The assumption that reactants are always in the numerator and products are always in the denominator of Mole ratios is thus false.
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The statements above here A and E are true and B,C,D and F are false in the given statements
A. Coefficients from an equilibrium chemical equation are included in mol ratios. This is true so because coefficients in a chemical equation denote the molar mass of each reactants and the products, and a molecular formula does have the same quantity of atoms of the elements on the both sides of this argument.
E. Mole proportions can be created between any set of products or reactants. This is accurate since a mole ratio is only a comparison of how much each component contributes to a chemical process.
The claims B, C, D, & F are false:
B. Stoichiometric coefficients are not included in mole ratios.
C. Only between two products can mole ratios be generated.
D. above, mole ratios can form between any combined effect of reactants and/or products. Only between two reactants may mol ratios be created.
F. above, mole ratios can form between any combined effect of reactants and/or products.
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Carbonic acid is a buffer that contributes to pH stability in human blood. Write out this chemical equation and explain what happens if our blood increases or decreases in pH
Answer: HCO3- + H3O --> H2CO3 + H2O (If an a strong acid is present)
H2CO3 + OH- --> HCO3- + H2O (If a strong base is present)
Explanation: Thankfully, we have buffers in our blood, without this buffer, one cup of lemon juice contains enough Hydronium ions (H3O) to kill us. This brings us to our first reaction. In this H2CO3/HCO3- buffer system, HCO3- acts as a weak base. If some strong acid that 100% dissociates into H3O+ happens to enter your blood, instead of the pH decreasing significantly it will only decrease slightly as HCO3- eliminates the H3O+ maintaining a relatively equal pH.
On the other hand, we have the H2CO3 reaction, if, for example, you decided to inject yourself with NaOH (Don't do it) it will dissociate 100% into OH. Since H2CO3 is a weak acid it will react with a strong base eliminating the OH- thus maintaining a stable pH.
Hope this helps. and if you need an explanation of why pH goes up slightly please comment. Good luck with Acid/Base/Equilibrium!!
in order for one type of atom to substitute for another in a solid solution, the substituting atom must be: (select all that apply.) identical in size similar in size the same element from the same group from the same period
"An atom must be similar in size" in order for one type of atom to substitute for another in a solid solution.
What properties must atoms share in order for them to substitute for one another?Atoms are called the basic building blocks of all matter. An element seems to be a substance that consist only one type of atom. Each element has their own name and distinct properties that set it apart from the others.The two atoms' sizes must be comparable. Otherwise, one atom cannot easily take the place of the other atom. The crystal structure of the two atoms must be the same. It would be difficult for one atom to substitute for the other if the two atoms crystallized in different ways.A substitution reaction occurs when one atom or group of a substance is replaced by another atom or group.The complete question:
"Select all that apply.
The requirements for one type of atom to substitute for another in a solid solution are:
All substitutions must be limited to the same element.
An atom must be identical in size.
An atom must be similar in size.
The substituting atom must be from the same period.
The substituting atom must be from the same group."
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If 0.725 g of calcium nitrate was added to 4.25 g of water (Kfp = 1.86°C/m), what would you expect the freezing point of that solution to be?
The solution would have a freezing point of - 5.8 °C.
What is the freezing point of the solution?
We have to note that in this case, we are dealing with the freezing point of the solution and this is one of the colligative properties that we have. We do know that;
ΔT = K m i
ΔT = Change in the temperature
K = freezing constant
m = molality
i = Vant Hoff factor
Then;
Number of moles of the calcium nitrate = 0.725 g/164 g/mol
= 0.0044 moles
Molality of the solution = 0.0044 moles/4.25 * 10^-3 Kg
= 1.04 m
Then we have;
ΔT = 1.86 * 1.04 * 3
= 5.8 °C
Then we have the new freezing point as;
O °C - 5.8 °C = - 5.8 °C
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Chlorine has two principal stable isotopes, 35Ci (isotopic mass 34.9689) and PCI (isotopic mas 36.9659). The atomic mass of Cl is 35.4527 amu. Which of the following options correctly describe these isotopes? Check all that apply. O The more abundant isotope comprises 75.774% of all stable Cl atoms O Ci comprises 34.97% of all stable Cl atoms O Ci has the greater abundance. O The two isotopes are equally abundant.
The more abundant isotope comprises 75.774% of all stable Cl atoms.
What is an isotope?
Isotopes are two or more types of atoms (or nuclides is the technical term) that have the same atomic number (the number of protons in their nuclei) and position in the periodic table (and therefore belong to the same chemical element) and that are different. in nucleon numbers (mass numbers) due to the different number of neutrons in their nuclei. While all isotopes of a given element have nearly the same chemical properties, they have different atomic masses and physical propertiesTo know more about isotopes, click the link given below:
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Imagine a small synthetic vesicle made from pure phospholipids enclosing an interior lumen containing 1 mM glucose and 1 mM sodium chloride. If the vesicle is placed in pure water, which of the following happens faster?a. water diffuses inb. sodium chloride diffuses outc. glucose diffuses out
The small synthetic vesicle made from pure phospholipids enclosing interior lumen containing 1 mM of glucose and 1 mM of sodium chloride. If it is placed in pure water , water diffuses in.
The osmosis is the process in which the solvents move from the low concentration to the high concentration through the semi- permeable membrane. The three types of osmosis is given as :
1) Hypotonic
2) Hypertonic
3) Isotonic
The water and the solvents tries to move into the low concentration to the high concentration through the semi- permeable membrane.
Thus, water diffuses in when synthetic vesicle made from pure phospholipids enclosing interior lumen containing 1 mM of glucose and 1 mM of sodium chloride and it is placed in pure water.
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