If the hydrogen ion concentration in molarity (M) are known, it is possible to calculate the pH of the solution. A concentration of the h+ ions affects the pOH value, which can also be used to calculate the pH of a solution. The solution's pH value is 12.79.
What is pH that is basic?Anything with a pH of 7.0 or below is acidic, & anything with a 7.0 or higher is alkaline or basic. There is a pH scale that lists all pH values for common materials and ranges from 0 (extremely acidic) to 14 (very basic/alkaline).
Meaning of pH ?an evaluation of a substance's or solution's acidity or basicity. On a scale from 0 to 14, pH is calculated. The pH value of 7 represents neutral on this scale, i.e., no acidic nor basic. More basic substances have a pH value more than 7, whereas more acidic substances have a pH value less than 7.
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Starting with 3.10 moles of iron how many moles of iron (III) oxide are produced?
3.10 moles of iron will produce 4.65 moles of iron (III) oxide are produced.
What is oxide ?
Oxide is a compound formed when an element combines with oxygen. It usually has the form of a solid and is often found naturally in the environment. Oxides can be either ionic or covalent in nature, depending on the elements involved.
Examples of oxides are iron oxide, carbon dioxide, and sulfur dioxide. Oxides can also be created synthetically in laboratories. Oxides have many uses in industry, including as catalysts, pigments, and in the production of ceramics.
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you adjust the ph to 7.0. after that you add 0.005 moles of naoh. draw the structure(s) of the species of glycine present in the solution and indicate the proportion of each species.
the types of glycine present there in solution and the amount of each kind in the solution, and the pka of both the NH2 group, which ranges from 9 to 78, determines the solution's pH at 3. pH = equiv = 9.78, then.
What is the benefit of glycine?
A picture of glycine
The amino acid glycine has a host of remarkable health advantages. To produce crucial substances like glutathione, creatine, and collagen, your body needs glycine. Additionally, this amino acid may enhance heart health and sleep quality while defending your liver from alcohol-related harm.
Who should avoid glycine intake?
Avoid consuming excessive dosages of a single amino acid over an extended period of time. Avoid using single amino acids in excessive dosages without first consulting a healthcare professional. It is not advised for women to take glycine supplements when they are expecting or nursing.
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how much heat q2q2 is transferred to the skin by 25.0 gg of steam onto the skin? the heat of vaporization for steam is l
As a result, we can conclude that the heat transfer from the steam is 56400 J.
What is heat of vaporization?The enthalpy of vaporization, also known as the heat of vaporization or heat of evaporation, is the amount of energy required to transform a liquid substance into a gas. The enthalpy of vaporization depends on the pressure at which the transformation occurs. The heat of vaporization is defined as the amount of heat required to convert 1g of a liquid into a vapor without causing the liquid's temperature to rise. "The latent heat of vaporization is the amount of heat required to convert a unit mass of liquid substance into a gaseous phase at constant temperature conditions."
Here,
56400 J worth of heat are transferred from the steam.
Given information: M = 25.0 g, or 0.025 kg, is the mass of steam.
The steam's latent heat of vaporization is,
L=2.256*10^6 J/Kg
Q=m*L
Solving as,
Q=25*2.256*10^6
Q=56400 J
Thus, we can say that 56400 J of heat are transferred from the steam.
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A cientit ue an accelerator and high energy electron to tudy the particle inide the proton of a helium atom. What particle i the cientit tudying?
A scientist uses an accelerator and high-energy electron to study the particle inside the proton of a helium atom. The particle, the client is studying, is the He quarks. The correct option is D.
What are quarks?Quarks are the most basic and fundamental constituents of matter. When high energy is shot into the helium nucleus to investigate the particles inside the proton, it is evident that the scientist is researching the quarks inside the proton. A proton contains two up quarks and one down quark.
When the photon particles of a helium atom are injected into a particle accelerator, scientists study the microscopic particles known as Helium quarks.
Therefore, the correct option is D. the He quarks
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The question is incomplete. Your most probably complete question is given below:
the He neutrons
the He nucleus
the He electrons
the He quarks
what statement about alloys is false? 1. generally, they are harder than the pure metals comprising them. 2. they are usually poorer conductors of electricity than their component metals. 3. the color of the alloy is always that of the metal present in the largest amount. 4. they usually have different properties from the pure metals comprising them
It is untrue to make the second claim. Contrary to popular belief, alloys are not always superior electrical conductors than the individual metals that comprise them. Electrical conductivity is quite good in alloys.
Metal is used to construct a multitude of products due to its strength and durability. These are used to make things like autos, satellites, and kitchenware. Although the majority of metals are hard, some are not. At room temperature, mercury is a liquid metal, as opposed to sodium and potassium, which can be cut with a knife. The definition of an alloy states that it is a substance produced by mixing two or more metals. Alloys can also be produced using combinations of metal and other elements.
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the energy of activation for the reaction described in the passage is given by the energy of: a.the reactants minus the energy of the products. b.the products minus the energy of the reactants. c.the activated complex minus the energy of the products. d.the activated complex minus the energy of the reactants.
The energy of activation is given by the energy of the activated complex minus the energy of the reactants. So the answer is d-the activated complex minus the energy of the reactants.
What factors affect activation energy?The rate of any reaction relies on the temperature at which it is running. As there is an increase in the temperature, the molecules move faster and therefore slam with each other more frequently. The moving molecules also hold more kinetic energy.
What lowers the activation energy?Enzymes affect the activation energies and lowers it. Enzymes lower the activation energy essential to convert a reactant into a product.
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FILL IN THE BLANK At 298 K and 1 atm, bromine is a liquid with a high vapor pressure, whereas chlorine is a gas. This provides evidence that, under these conditions, the forces among Br2 molecules are _______ than those among Cl2 molecules
Answer: stronger
Explanation: At higher temperatures, Br2 takes more energy to break apart the molecules. Therefore, the intermolecular forces, most likely london dispersion, will need more energy. Cl2 has weaker forces and takes less to break it apart.
A student draws a distance verses time graph to describe the motion of a model train. What does a
horizontal section of the graph indicate about the motion of the train?
A student draws a distance verses time graph to describe the motion of a model train therefore the horizontal section of the graph indicates that the train is moving with uniform velocity with no acceleration because there is no change in velocity.
What is Uniform Velocity?This occurs when the average velocity between any two points along its path is the same in magnitude as well as direction.
If the velocity-time graph for the part of a journey is a horizontal line, then it simply means that the train is moving with uniform velocity with no acceleration because there is no change in velocity thereby making it the correct choice.
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which of the following statements are true? group of answer choices during a phase change temperature increases during a phase change temperature decreases. during a phase change temperature does not change. during a phase change temperature does change.
It is accurate to state the following. Temperature is unaffected by a phase change. As a result, choice c) is accurate.
What exactly is the name of a phase change?Phase transition is the process by which a substance transforms from one state—solid, liquid, or gas—to another. Every substance and substance has a precise range of temperatures and pressures at which it can change by one phase to another.
A phase change process is what?Energy changes are physical processes that cause a material to change its phase. The transformation frequently occurs at a particular temperature, usually known as the drug's melting or boiling point, as heat is used or removed.
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The Complete Question :
During a phase change, the temperature of a substance
a. increases
b. decreases
c. does not change
d. increases or decreases
The correct statement is: temperature is unaffected by a phase change.
As a result, during a phase change temperature does not change, this option is correct.
What exactly is the name of a phase change?Phase transition is the process by which a substance transforms from one state—solid, liquid, or gas—to another. Every substance and substance has a precise range of temperatures and pressures at which it can change by one phase to another.
Energy changes are physical processes that cause a material to change its phase. The transformation frequently occurs at a particular temperature, usually known as the drug's melting or boiling point, as heat is used or removed.
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why are diseases transmitted through the bites of infected animals not considered contagious diseases
Answer:
Diseases transmitted through the bites of infected animals are not considered contagious because they are not spread through direct contact with another person or through the air.
Explanation:
These diseases are typically caused by microorganisms or viruses that are specific to certain animal species, and they are not easily transmitted to humans. Additionally, many of these diseases require a specific set of circumstances to be transmitted, such as a bite or scratch from an infected animal, which makes them less likely to spread widely within a population. Contagious diseases are typically spread through direct contact with an infected person or through the air, such as through respiratory droplets from a sneeze or cough.
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the heating curve for a sample of pure ethanol is provided above. the temperature was recorded as a 50.0 g sample of solid ethanol was heated at a constant rate. which of the following explains why the slope of segment t is greater than the slope of segment r? a the specific heat capacity of the gaseous ethanol is less than the specific heat capacity of liquid ethanol. b the specific heat capacity of the gaseous ethanol is greater than the specific heat capacity of liquid ethanol. c the heat of vaporization of ethanol is less than the heat of fusion of ethanol. d the heat of vaporization of ethanol is greater than the heat of fusion of ethanol.
The correct explanation for why the slope of segment t is higher than the slope of segment r is because the specific heat capacity of gaseous ethanol is lower than that of liquid ethanol (explained by the statement "a").
What is ethanol used for?Beer, wine, and spirits all contain ethanol when they are diluted. It is a topical ingredient used in pharmaceutical preparations (such as rubbing compounds, lotions, tonics, and colognes), cosmetics, and perfumes to prevent skin infections. Organic substances include ethanol. With the chemical formula C2H6O, it is an alcohol. Its chemical formula can also be expressed as C2H5OH or CH3CH2OH. A volatile, flammable, colorless liquid known as ethanol has a distinctive wine-like odor and bitter flavor.
Is ethanol good for the body?Because it interferes with immune system and hepatic metabolism, ethanol can cause malnutrition and have a direct toxicological effect. Alcohol and a number of cancers have been linked causally, according to research. The effects of ethanol consumption include nausea, slurred speech, reduced reaction times, altered moods, and uncoordinated movements. Higher exposures might lead to symptoms like sweating, vomiting, dizziness, confusion, and blurred vision.
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sort the following manganese compounds by whether the cation is manganese(ii) or manganese(iii).
Drag each item to the appropriate bin. View Available Hint(s) Reset Help MnSs MnN MnBrz Mnl, Mn,P2 Mno Manganese(l) Manganese(III)
The manganese compounds with manganese (II) cation are MnO, MnBr2, and Mn2S3 and with manganese (III) cation are MnN, Mn3P2, and MnI3.
Cations refers to the positively charged ions (atoms or groups of atoms that have more protons than electrons due to having lost one or more electrons) and anions refers to the negatively charged ions (atoms or groups of atoms that have more electrons than protons due to having gained one or more electrons). In order to determine if the manganese ion is manganese (II) or manganese (III), the anion bonded to it is considered. In MnN as N = -3 hence, so the cation is Mn (III). In MnO, O = -2 so the cation is Mn (II). In MnBr2, Br = -2 so the cation is Mn (II). In Mn2S3, S = -2 so cation is Mn (III). In Mn3P2, P = -3 so the cation is Mn (II). In MnI3, I = -3 so the cation is Mn (II).
Note: The question is incomplete. The complete question probably is: 1. Sort the following manganese compounds by whether the cation is manganese (II) or manganese (III). MnN MnO MnBr2 Mn2S3 Mn3P2 Mnl3
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What is the limiting reactant for each amount of reactants in the following reaction: 2Na (s) + Br2 (g) -> 2 NaBr (s)
a) 2 mol Na, 2 mol Br2
b) 2.5 mol Na, 1 mol Br2
c) 1.8 mol Na, 1.4 mol Br2
d) 12.6 mol Na, 6.9 mol Br2
The limiting reactant for each amount of reactants in the reaction 2Na(s) + Br₂(g) -> 2NaBr(s) can be determined by comparing the number of moles of each reactant to the balanced equation and identifying which reactant runs out first. option B to D.
What is limiting reactant?The limiting reactant (or limiting reagent) is the reactant that is consumed first in a chemical reaction, limiting the amount of product that can be formed.
a) 2 mol Na, 2 mol Br₂:
The balanced equation states that for every 2 moles of Na, 2 moles of Br₂ are required. Since the amount of Na and Br₂ are the same, either one could be the limiting reactant.
b) 2.5 mol Na, 1 mol Br₂:
The balanced equation states that for every 2 moles of Na, 2 moles of Br₂ are required. Since there is only 1 mol of Br₂ and 2.5 mol of Na, Br₂ is the limiting reactant.
c) 1.8 mol Na, 1.4 mol Br₂:
The balanced equation states that for every 2 moles of Na, 2 moles of Br₂ are required. Since there is only 1.4 mol of Br₂ and 1.8 mol of Na, Br₂ is the limiting reactant.
d) 12.6 mol Na, 6.9 mol Br₂:
The balanced equation states that for every 2 moles of Na, 2 moles of Br₂ are required. Since there is only 6.9 mol of Br₂ and 12.6 mol of Na, Br₂ is the limiting reactant.
In summary, the limiting reactant is the one that runs out first, and the amount of product formed will be limited by the amount of limiting reactant present. In the reaction 2Na (s) + Br₂(g) -> 2 NaBr(s), Br₂ is always the limiting reactant.
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PLEASE HELP ME WITH THIS QUESTION I NEED IT
The correct balanced equation for the reaction between zinc and dihydrogen sulfate is:
Zn + H₂S -> ZnS + H₂ (Option C)
How do I balance the equation?We can balance chemical equation by simply obeying the law of conservation of matter.
The law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
Now, we shall write the balance equation as shown below:
Zinc => Zn Dihydrogen sulfate => H₂SZinc + Dihydrogen sulfate ->
Zn + H₂S ->
Zinc displaces H to produce H₂ as shown below:
Zn + H₂S -> ZnS + H₂
Since the atoms of the elements on both sides of the equation are equal, then the equation is balanced
Thus, the correct answer is: Zn + H₂S -> ZnS + H₂ (Option C)
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what happnes to particles of water as the temperture of the sample of water approaches O K
Answer:
With an increase in temperature, the particles gain kinetic energy and vibrate faster and more strongly.if 1.38 grams of sodium phosphate were dissolved in 50 ml of water, how mahy mols of ions would there be in the solution
The solution would contain 0.0084 mols of ions if 1.38 grams of sodium phosphate were dissolved in 50 mL of water.
What is mole concept?In the International System of Units, the mole (symbol mol) is the unit of substance amount. The amount of substance is a measurement of how many elementary entities of a given substance are present in an object or sample. The mole is defined as having 6.022140761023 elementary entities. The mole concept is an easy way to express the amount of a substance. Any measurement is divided into two parts: the numerical magnitude and the units in which the magnitude is expressed. Due to the small size of atoms and molecules, the mole concept allows us to count atoms and molecules by weighing macroscopically small amounts of matter.
Here,
given mass=1.38 gram
molar mass,
=23*3+31*1+16*4
=69+31+64
=164 grams
moles=given mass/molar mass
=1.38/164
=0.0084 moles
If 1.38 grams of sodium phosphate were dissolved in 50 mL of water, the solution would contain 0.0084 mols of ions.
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there are five basic taste sensations: sweet, sour, bitter, salty, and umami. b. fluid is needed to help dissolve foods for tasting. c. they react only with particles in solution.
Only particles in solution react during taste perception, which is also influenced by scent, appearance, and temperature.
How do umami, bitter, and sweet taste cells get activated?
G protein-coupled proteins (GPCRs) from the T1R and T2R groups are activated on tasting receptor cells to release the bitter, umami, and sweet sensations that mammals detect.
What causes the perception of sweetness?
The brain's neurological pathways for interpreting and responding to sweet stimuli are activated when sweet endings in the mouth—which are involved in the experience of sweet taste—are stimulated with either nutritional sweeteners or LCS.
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the actual measured membrane potential for the muscle cell was -90 millivolts. From this information, what conclusion can you draw concerning the relative conductances of sodium and potassium in these cells at rest (i.e. in the absence of action potentials) assuming that sodium and potassium are the only ions that ocntribute to membrane potentials. Is this last assumption valid
Since the muscle cell's actual observed membrane potential was -90 millivolts, the overshoot is the portion of the action potential between the 0 mV level and the highest amplitude.
The repolarization phase is the period of time when the membrane potential returns to its resting potential.
What is the membrane?Every cell has a cell membrane, often referred to as a cell membrane, that divides the cell's internal environment from the outside world. The cell membrane regulates the flow of materials to and from the cell. When transmembrane pressure is exerted across a membrane, a thin layer of semi-permeable material called a membrane is employed to separate solutes. The membrane charge and porosity have a significant impact on the degree of selectivity.
What is membrane made of?With a few rare exceptions, glycerophospholipids, which are made up of glycerol, a phosphate group and two fatty acid chains, are the primary component of cellular membranes, including plasma membranes and interior membranes.
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what is characteristic of an aqueous solution of hno3? group of answer choices it conducts electricity. with the addition of phenolphthalein, it turns pink. it produces oh- in solution. it turns litmus blue.
Nitric acid (HNO3) is a colorless, fuming, and extremely corrosive liquid with freezing and boiling points of 42 and 181 degrees Celsius, respectively. that is a popular laboratory reagent and an important industrial.
HNO3 undergoes what kind of reaction?Neutralization is a chemical process that happens when an acid is put to a base. Nitric acid, HNO3, reacting with the basic potassium hydroxide, KOH, is one example.
Is HNO3 acidic when dissolved in water?Acids such as hydrochloric acid (H C l), nitric acid (H N O 3), and others exhibit an acidic nature as a result of their dissolution in aqueous solutions and generation of hydrogen ions. The acidic character of the compounds is caused by this hydrogen ion.
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Nitric acid (HNO3) has a freezing point of 42 degrees Celsius and a boiling point of 181 degrees Celsius. It is a whitish, fuming, and very corrosive liquid. It is a well-liked and crucial industrial reagent for laboratories.
What sort of reaction occurs with HNO3?When such an acid is added to a base, a chemical reaction called neutralization takes place. One example is the reaction of nitric acid (HNO3) and the basic potassium nitrate (KOH).
HNO3 dissolved in water is it acidic?Because they dissolve in aqueous phase and produce hydrogen ions, acids like hcl (H C l), potassium nitrate (H 4-hydroxy N 3), and many others have an acidic character. This hydrogen ion is what gives the compounds their acidic nature.
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Part B For ClO- . write an equation that shows how the anion acts as a base express your answer as a chemical equation. Identify all of the phases in your answer.
Describe your response in terms of a chemical equation that demonstrates how the anion functions as a base. HF (aq) OH- = F- (aq) H2O (l).
Give an example of a chemical equation.The reactant organisms are presented on the left handed side of a chemical equation, while the product objects are given on the right hand side. A empirical formula is a symbol of a chemical reaction that takes the shape of symbols and equations. such as CaCO3(s)CaO(s)+CO2 (g)
What is the chemistry formula equation?Formula Equation: Uses symbols or formulas to represent the products and reactants of a chemical reaction. The relative amounts of the reactants and products in the formula must be changed to ensure that the atom counts and types on both sides of the equation are equal.
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Which of the following molecules are polar: Cl2, CO2, BF3, NO, SO2, XeF4Group of answer choicesNO, SO2 onlyCl2, CO2 onlyNO, XeF4 onlyBF3, XeF4 only
Among the given options, the molecules which are polar are :NO,SO₂ and XeF₄.All the other molecules are non-polar.
What determines the polarity of molecules ?The polarity of a molecule depends on the distribution of electron density around the atoms. In general, a molecule is polar if the electron density is not symmetrically distributed around the central atom or if there is a difference in electronegativity between the atoms.
In Cl₂ the electron cloud is symmetrical and both Cl atoms have the same electronegativity. In CO₂ the central atom is carbon and it has two equal and opposite dipoles, which cancel each other out. In BF₃, the electron cloud is symmetrical. NO is polar because Nitrogen and Oxygen have a difference in electronegativity, hence the electron cloud is not symmetrical. SO₂ is polar because the Sulfur atom has a greater electron-withdrawing ability than the oxygen atoms. XeF₄ is polar because the electron cloud is not symmetrical and Xe has a greater electron-withdrawing ability than Fluorine.
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Please Help! I need this done ASAP! Both questions please!!
Answer and Explanation for Question 3
The volume of H₂S needed to neutralize 45 mL of NH₂⁻ is 30 mL. Thus, the correct answer would be B.
To calculate this, we need to use the stoichiometric equation. First, we find the moles of NH2- present in the solution: 45 mL × 0.80 M = 0.036 moles. Then, we need to find the moles of H2S needed to neutralize this, which is equal to the moles of NH2- since the reaction is 1:1. Therefore, we need 0.036 moles of H2S. To convert this to volume, we need to divide by the molarity of the H2S solution: 0.036 mol/1.2 M = 0.03 L, or 30 mL.
Answer and Explanation for Question 4:
The indicator most appropriate for this reaction would be phenolphthalein. Thus, the correct answer would be D.
In this acid-base titration, a solution of HCl is added to an unknown concentration of a base, with the initial pH of the solution being approximately 10. As HCl continues to be added to the mixture, the pH remains relatively unchanged until 50 mL of HCl have been added, at which point the pH of the mixture drops sharply to approximately 3, indicating that the equivalence point has been reached.
Indicators can help us detect the equivalence point of a titration. Phenolphthalein changes color from pink to colorless when the pH of the mixture drops below 8.3, which is what happens in this reaction. Therefore, phenolphthalein would be the most appropriate indicator for this reaction.
Sulphur burns in air to form sulphur dioxide: S+O2→SO2. What is the mass of sulphur that must be burned to produce 64g of sulphur dioxide?
It takes 1 mol of sulfur to produce 1 mol of sulfur dioxide. Therefore, 64 g of sulfur is required to produce 64 g of sulfur dioxide.
To calculate the mass of sulfur required to produce 64 g of sulfur dioxide, the following equation can be used:
m (sulfur) = (64 g SO2) / (32 g/mol SO2) × (1 mol S/ 32 g S) = 2 mol S
Therefore, the mass of sulfur required to produce 64 g of sulfur dioxide is 2 mol S or 64 g.
The mass of sulfur that must be burned to produce 64 g of sulfur dioxide is 64 g. This is because the molar mass of sulfur dioxide is 32 g/mol and the molar mass of sulfur is 32 g/mol.
Therefore, it takes 1 mol of sulfur to produce 1 mol of sulfur dioxide. Therefore, 64 g of sulfur is required to produce 64 g of sulfur dioxide.
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8. show this with your fuzzy sticks. bind together two oxygen atoms by having them share four electrons. how many electrons does each atom now have available?
When two oxygen atoms bind together by having them share four electrons, each atom now has eight electrons available. This is because each oxygen atom starts off with six electrons in its outer shell, and when they share four electrons, each atom now has eight electrons available.
This type of bonding is known as a covalent bond, and is formed when two atoms share electrons to fill up their outer shells.
A covalent bond is formed when two atoms share electrons to fill up their outer shells. This type of bonding is very strong because the shared electrons are held by both atoms, allowing them to form a strong bond.
The shared electrons also help to stabilize the atoms, making them less likely to react with other atoms. Covalent bonds can be single, double, or triple bonds, depending on how many electrons are shared by the two atoms.
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Convert 2. 75 x 104 kJ to calories. Express your answer in terms of calories VAZO ? -- cal Submit Request Answer 27 < Return to Assignment Provide Feedback
The conversion of the kJ to calorie is :
2.75 × 10⁴ kJ = 6.572 × 10⁶ cal
The conversion is given as :
The kilojoules and the calories both are the unit that will measures the energy. The energy is measure in the kilojoules, kJ.
1) kJ to J
2.75 × 10⁴ kJ = 2.75 × 10⁴ × 1000
= 2.75 × 10⁷ J
2) J to calorie
2.75 × 10⁷ J = 2.75 × 10⁷ × 0.239
= 6.572 × 10⁶ cal
Thus, the kJ to the cal conversion is 2.75 × 10⁴ kJ = 6.572 × 10⁶ cal.
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a sample of an ideal gas at 1.00 atm1.00 atm and a volume of 1.69 l1.69 l was placed in a weighted balloon and dropped into the ocean. as the sample descended, the water pressure compressed the balloon and reduced its volume. when the pressure had increased to 50.0 atm,50.0 atm, what was the volume of the sample? assume that the temperature was held constant.
As the sample descended, a weighted balloon carrying an ideal gas sample with a capacity of 1.7 L and an atmospheric pressure of 1.00 atm was released.
At 0°C and 1 atm, what is the density of 60 ml of ideal gas?22.41 L/mol
At STP (Std Pressure and Temperature = 0 °A and, 1 atm), how big is one mole of a thermodynamic ,equilibrium? Therefore, at STP, an ideal gas has a volume of 22.41 L/mol. The least important and most widely remembered chemical number is 22.4 L.
What does Boyle's law say 1 atm is?760 mm Hg equals 1 atm. However, the Pascal is the accepted pressure measurement unit around the world. 1 atm Equals 101325 Pa. Robert Boyle, an English scientist, carried out.
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which of the following is not a colligative property? group of answer choices freezing point depression increasing solubility vapor pressure lowering boiling point elevation
Freezing point. The known colligative properties of a solution are freezing point depression, osmotic pressure, vapor pressure lowering, and boiling point elevation.
What do you mean by freezing explain?Freezing refers to the phase change of a substance from the liquid state to a solid-state. This is a phase change phenomenon which means that a substance is transformed from one state of matter to another state.
What is freezing give an example?The change in the liquid to the solid phase at a constant temperature is called freezing. The temperature at which liquid changes to solid is called the freezing point. Example: water-filled in an ice cube tray, when kept in the freezer, changes into solid, so here the water freezes to form ice cubes.
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a solution is prepared by dissolving 10.8 g of sodium sulfate (na2so4) in enough water to make 100.0 ml of solution. 10.00 ml of this solution is then added to 50.00 ml of water. calculate [na2so4] in each solution.
A solution by dissolving 10.8g of sodium sulphate (Na2SO4) in 100.0ml of water. Then add 10.00 ml of this solution to 50.00ml of water. The concentration of Na2SO4 is 0.012M (SO4)2- and 0.024M Na+.
Given the mass of sodium sulfate (na2so4) (m) = 10.8g = 10.8 x 10^-3kg
The volume of stock solution (V) =100ml = 0.1L
the extra volume added (V') = 10ml = 0.01L
The volume of water is (V'') = 50ml = 0.05L
We know that molarity = number of moles/volume of solution
Utilizing its molar mass, we should convert the provided mass of (Na2SO4) to moles.
10.8g 0f Na2SO4 x 1mol Na2SO4/142.04 = 0.076mol Na2SO4
Calculate the molarity of the solution by multiplying this amount by 100mL solution.
molarity = 0.076/0.1 = 0.76M
A total of 60mL of this solution is created by adding 10mL of it to 50mL of water. From dilution equation M1V1 = M2V2 to find the molality of 60mL solution.
(0.076) x (0.01) = M2 x (0.06)
M2 = 0.012M
This means that there are 0.012 moles of Na2SO4 per liter of solution. As it contains 2 Na+ and 1 (SO4)2- ions the concentrations of each ion is thus calculated as: 2 x 0.012 = 0.024M Na+ and 0.012M (SO4)2-.
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Which of the following gases has the lowest average speed at 25 degree C? a. H2Se b. PH3 c. C2H6 d. F2
Since H2Se has the biggest molar mass of the gases, it has the lowest average velocity.
In chemistry, what does a molar mass mean?A substance's mass expressed in grams per mole is known as its molar mass. As seen in this video, the molar mass of a substance may be calculated by adding the molar masses of the material's component atoms.
Are the atomic and molar masses equivalent?Atomic mass is the mass of a single compound unit, whereas molecular mass refers to the mass of a single mole of a compound. In essence, atomic mass is the mass of the atom, while molar mass is the average mass of the compound's constituent parts.
Molar mass of H2Se = 78.98 + 2(1) = 80.98 g/mol
PH3 = 30.99758 + 3(1) = 33.99758 g/mol
C2H6 = 12(2)+6(1) = 30 g/mol
F2 = 37.997 g/mol
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if only the chemical formula were given for the compounds in the above examples, how could you determine the amount of charge on the cation
Given only the chemical formula of a compound, it is difficult to determine the charge of the cation without additional information. However, there are several ways to infer the charge of cations.
Look for polyatomic ions.
Many cations are composed of metal ions and polyatomic ions. Polyatomic ions often exhibit a cationic charge. For example, if the chemical formula is NaNO3, the cation is Na+ because nitrate (NO3) is always -1.
Note the presence of transition metals:
transition metals can have multiple oxidation states, and the oxidation state can be inferred by the presence of other elements in the compound.
Look at the periodic table:
Some elements on the periodic table are the alkali metals (group 1), which are always +1, and the alkali metals, which are always +2.
However, it is important to note that even using these methods it can be difficult to determine the charge of the cation without additional information. In many cases, it is necessary to refer to references such as textbooks or chemistry databases to ascertain the load.
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