Answer:
protons
Explanation:
the protons and electrons of an element are the same amount however the neutrons are a different amount
You are trying to determine the
mass of sodium chloride required to
create a 0.875 m solution in 534 g of
water. How many moles of NaCl are
required?
Answer:
Answer:
Mass = 27.291 g
Explanation:
Given data:
Mass of sodium chloride = ?
Mass of water = 534 g
Molality = 0.875 m
Solution:
Molality:
It is the number of moles of solute into kilogram of solvent.
Formula:
Molality = number of moles of solute / kilogram solvent
Mathematical expression:
m = n/kg
Now we will convert the g into kg.
Mass of water = 534 g× 1kg/1000 g = 0.534 kg
Now we will put the values in formula.
0.875 m = n / 0.534 kg
n = 0.467 mol
Now we will calculate the mass of sodium chloride:
Mass = number of moles × molar mass
Mass = 0.467 mol × 58.44 g/mol
Mass = 27.291 g
What mass of solute will dissolve in 100g of water at the following temperatures?
• KNO3 at 70°C =
• NaCl at 100°C=
• NH₂Cl at 90°C=
[tex]KNO_3[/tex] at 70°C = 130 gram
NaCl at 100°C= 40 gram
NH₂Cl at 90°C= 70 gram
What is solubility?Solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specified temperature.
Amount of a substance (called the solute) that dissolves in a unit volume of a liquid substance (called the solvent) to form a saturated solution under specified conditions of temperature and pressure. Solubility is expressed usually as moles of solute per 100 grams of solvent.
Hence,
[tex]KNO_3[/tex] at 70°C = 130 gram
NaCl at 100°C= 40 gram
NH₂Cl at 90°C= 70 gram
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which experimental technique was most likely used by the students to determine the rate of reaction?
The students can determine the rate of reaction by measuring change in concentration of reactant or product with time.
What is rate of reaction?The rate of a reaction is the rate at which reactant molecules are used up or the rate at which product molecules are formed.
The rate of a reaction can be determined by measuring the change in concentration of the reactant at each given time in a reaction.
The rate of reaction can be also be determined by measuring the change in concentration of the product at each given time in a reaction.
Therefore, the students can determine the rate of reaction by measuring change in concentration of reactant or product with time.
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Determine the quantity of each atom in a compound
1. CaCO3
2.3 BaF2
3.4 H₂PO4
4. Sr(OH)₂
5. 3 Al2(Cr₂O7)3
. Sodium hydroxide is added drop by drop to some hydrochloric acid in a beaker. Which of the following occurs in the beaker? .
Answer:
Table salt+water
Explanation:
When hydrochloric acid and sodium hydroxide interact it results in the formation of salt and a release of heat. The result of these 2 highly aggressive compounds is table salt and water. (Compounds that are ultimately harmless, even beneficial to us human beings)
Hope i helped
How many electrons are in a ion that has 16 protons and 59 neutrons if it has negative 2 charge?
Which of the following reactions would result in decreased entropy?
Q A. CO,(s) → CO2(g)
OB. H₂O(g) → H₂O()
OC. 203(g) → 30₂(g)
D. N₂204(g) → 2NO₂(g)
The reaction that would result in decreased entropy is : ( A ) CO(s) → CO2(g)
What are Endothermic reactionsReactions that absorb heat from its surroundings are known as endothermic reactions, Endothermic reactions result in a decreased entropy as the temperature of the surrounding becomes lower than the temperature of the container where the reaction occurs.
Examples of endothermic reactions are : melting and evaporation which results in the change of state from solid to liquid or from solid to gaseous state.
Hence we can conclude that The reaction that would result in decreased entropy is : ( A ) CO(s) → CO2(g)
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An electron moved from shell n = 2 to shell n = 1. What most likely happened during the transition? (4 points)
A fraction of a photon was added.
A photon of energy was absorbed.
A fraction of a photon was removed.
A photon of energy was released.
Can you find the difference between the following changes? why? a)rolling of chapati from dough b) baking of chapati
Answer:
They have different temperatures.
Explanation:
Answer:
a. when we are rolling the dough it only changes the shape, its a physical change.
b. we cant change the shape once its cooked, its a chemical change
Explanation:
hope it helps
entir
What is the striking back of
the
bunsen-
burner?
Answer:
With too little air, the gas mixture will not burn completely and will form tiny carbon particles that are heated to glowing, making the flame luminous. With too much air, the flame may burn inside the burner tube; that is, it may strike back.
12.11 liters of gas at atmospheric pressure is compressed into a 0.669 L gas cylinder. What is the pressure (mm Hg) of the compressed gas if its temperature remains constant?
a. 1.38e4
b. 42.0
c. 93.8
d. 18.1
Answer:
a. [tex]P_2=1.38*10^4[mmHg][/tex]
Explanation:
If the Temperature of a gas remains constant (and if the amount of gas molecules doesn't change), then compressing the gas from 12.11 L to 0.669L will increase its pressure through Boyle's Law: [tex]P_1V_1=P_2V_2[/tex]
We'll also need to recall that atmospheric pressure with units of mmHg (since that is the unit requested in the answer) is 760 mmHg.
Letting the initial Pressure and Volume be the P1 and V1, and the final pressure be the P2 and V2, we can substitute and solve:
[tex]P_1V_1=P_2V_2[/tex]
[tex](760[mmHg])(12.11[L])=P_2(0.669[L])[/tex]
[tex]\dfrac{(760[mmHg])(12.11[L \!\!\!\!-])}{0.669[L \!\!\!\!-]}=\dfrac{P_2(0.669[L]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}{0.669[L]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----}}[/tex]
[tex]13757.2496[mmHg]=P_2[/tex]
Since the final pressure is only measured to 3 significant figures, we round the pressure accordingly
[tex]13800[mmHg]=P_2[/tex]
Note that in scientific notation, this is [tex]P_2=1.38*10^4[mmHg][/tex], occasionally written as [tex]1.38\text{E}4[mmHg][/tex]
Which of the following is using chemical potential energy?
O A. An apple hanging on a tree
B. A water wheel turning in a stream
OC. A hiker eating an energy bar
OD. A petal falling from a flower
Among the following options eating an energy bar by a hiker using a chemical potential energy.
Wha is chemical potential energy ?Chemical potential energy is the energy stored in the chemical bonds of a substance.
The food we eat contains stored chemical energy.
As the bonds between the atoms in food loosen or break, a chemical reaction takes place, and new compounds are created.
The energy produced from this reaction keeps us warm, helps us move, and allows us to grow
Hence, eating an energy bar by a hiker using a chemical potential energy.
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Choose the correct statements when comparing 1 mole of carbon
monoxide and one mole of helium gas.
a: they weigh the same
b: they have the same amount of particles
c: they occupy the same volume
Answer: they have the same amount of particles
Explanation:
This statement is true by Avogadro's Law, which states that in a mole of any substance, there are [tex]6.022 \times 10^{23}[/tex] particles.
what is the percent composition of each element within the compound
Answer:
The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100. Here, the quantity is measured in terms of grams of the elements present.
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7 on the pH scale represents what?
Answer:
seven on the ph scale is the neutral point
Explanation:
The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.
30 points!!!! Answer fast
EXPERIMENT: MAGNETISM Bar Magnet
1. Place the bar magnet on a table.
2. Put a sheet of glass or plastic over the magnet.
3. Sprinkle the iron filings over the sheet evenly.
4. On a separate paper, sketch the magnet. Show the lines made by the iron filings. Horseshoe Magnet
5. Place a horseshoe magnet on the table.
6. Put a sheet of glass or plastic over the magnet.
7. Sprinkle the iron filings over the sheet.
8. On a separate paper, sketch the magnet. Show the lines made by the iron filings. N Pole to N Pole
9. Place two bar magnets N pole to N pole with an inch between them.
10. Put a piece of glass or plastic over the magnets.
11. Sprinkle the iron filings over the glass or plastic.
12. On a separate paper sketch the magnets. Show the lines made by the iron filings. N Pole to S Pole
13. Turn one of the bar magnets around so the magnets are N pole to S pole with an inch between.
14. Sprinkle the iron filings over the glass or plastic.
15. On a separate paper sketch the magnets. Show the lines made by the iron filings.
From the information you have observed, determine the following:
What rule of magnetism is illustrated by the lines of the iron filings in Step 12?
What rule of magnetism is illustrated by the lines of the iron filings in Step 15?
Why was glass or plastic used to separate the filings from the magnets in the experiments?
Did the glass or plastic stop the passage of the magnetic lines of force?
Did the iron filings almost or completely bridge the open end of the horseshoe magnet?
The magnetism is either created inside a given element by passing some number of charges,Q across it or it is due to the interaction with a permanent magnet.
What is Magnetism ?
A physical phenomenon produced by the motion of electric charge, which results in attractive and repulsive forces between objects.
The magnet consists the characteristics of having an optimum amount of energy (P.E inside it) inside it.
As, the energy lines are either directed outwards from the north pole of the magnet, the south pole of the magnet consumes or absorbs the magnetic rays(energy lines) originated from the north pole of the magnet.
The right hand rule of magnetism is illustrated in the 12 point of the question.Learn more about magnetism here ;
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How many moles of fluorine atoms are in a sample of fluorine that contains 7.45 x 10^24 fluorine atoms? (Report your answer to one place past the decimal point.
Based on the calculations, the number of moles of fluorine atoms present is equal to 12.4 moles.
How to calculate the moles of fluorine atoms?In order to determine the number of moles of fluorine atoms, we would calculate the number of atoms in 1 mole of an fluorine atoms in accordance with Avogadro's constant.
1 mole of fluorine atom = 6.02 × 10²³ molecules
X moles of fluorine atom = 7.45 × 10²⁴ molecules
Cross-multiplying, we have:
X = 7.45 × 10²⁴/6.02 × 10²³
X = 12.4 moles.
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Pls tell me how to solve this!
Answer:
12 seconds
Explanation:
Time taken by 50cm³ of oxygen to diffuse from pinhole
= 1 minute = 60 seconds
⠀
⠀
[tex] \textsf{ Rate of oxygen} \sf (O_2) = \frac{50}{60} [/tex]
⠀
⠀
⠀
Let time taken by 50cm³ of hydrogen to diffuse from pinhole = t seconds
⠀
⠀
[tex] \textsf {Rate of hydrogen } \sf(H_2) = \frac{50}{t} [/tex]
⠀
⠀
⠀
According to the formula
[tex] \sf \frac{Rate \: of \: hydrogen(H_2)}{Rate \: of \: oxygen(O_2) } = \sqrt{ \frac{Molar \: mass \: of \: O_2}{Molar \: mass \: of \: H_2} } [/tex]
⠀
⠀
[tex] \large \sf \frac{50}{t} \div \frac{50}{60} = \sqrt{ \frac{\cancel{32}\small 16}{\cancel2} } \\ \\ \sf \large \frac{ \cancel{50}}{t} \times \frac{60}{ \cancel{50}} = \sqrt{16} \\ \\ \sf \large \frac{60}{t} = 4 \\ \\ \sf \large \frac{ \cancel{60} \: \small12}{ \cancel4} = t \\ \\ \large \underline{ \boxed{ \tt t = 12 \: seconds}}[/tex]
⠀
⠀
⠀
Henceforth, the time taken by 50cm³ of hydrogen to diffuse is 12 seconds.⠀
⠀
Thank you!The bonds of the product store 27 KJ more energy than the bonds of the reactants how is energy conserved during this reaction
A.The reaction creates 27 kj of energy when bonds form.
B.The reaction system absorbs 27 kj of energy from the surroundings.
C.The reaction uses up 27 kj of energy when bonds break.
D.The surroundings absorb 27 kj of energy from the reaction system.
ANSWER: the answer is b
If the bonds of the product store 27 KJ more energy than the bonds of the reactants, It means the surroundings absorb 27 kj of energy from the reaction system Hence, Option (D) is the correct answer
What is the Exothermic reaction ?An exothermic process releases heat, causing the temperature of the immediate surroundings to rise.
The bonds of the product store 27 KJ more energy than the bonds of the reactants, It means that energy has been absorbed by the surrounding as the product formed is more stable due to more stronger bond
This can be inferred from more stored energy with in the bonds and Thus, It is a exothermic reaction.Hence, Option (D) is the correct answer
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can a chemical reaction take place without enzyme
Answer:
Theoretically, Yes (See the explanation)
Explanation:
The body has enzymes that catalyze processes, as several other respondents have mentioned. I haven't noticed any comments, but the reverse impact might be just as significant. Some enzymes are reaction inhibitors. Others operate as both catalysts and inhibitors, depending on the amounts of the reactants and reaction products close to the catalyst. I'll provide an illustration to demonstrate how crucial inhibition may be. Let's say you consume three banana splits one after the other. That is a large number of calories. You would have a very high temperature and be so energetic and full of energy that you would be bouncing off the walls if all those calories were converted simultaneously into energy and heat. But neither you nor I have ever heard of overeating creating a high temperature or anxiety. This is due to the fact that many of the high energy molecules produced by the process hinder the enzymes that regulate metabolism, which produces the energy needed to power your body and generate heat. In other words, if you don't require high energy, your body won't keep making it. When there are huge amounts of carbohydrates around, the enzymes that turn the carbohydrates you consumed into glycogen and fat (to store the extra energy you don't need right now) become catalytic (mostly glucose). Therefore, the /majority of the energy from those three banana splits will be stored as fat and glycogen as it won't be needed. And that occurs as a result of the reaction to turn the sugars into energy being blocked by the lack of a demand for the energy at the time. Both enzymes that act as catalysts and those that act as inhibitors are essential to the healthy operation of our bodies.
________________________________________________________
Definitions:
Enzymes: Any of various proteins, as pepsin, originating from living cells and capable of producing certain chemical changes in organic substances by catalytic action, as in digestion.
Metabolism: The sum of physical and chemical processes in an organism by which its material substance is produced, maintained, and destroyed, and by which energy is made available.
Glucose: A sugar, C6H12O6, having several optically different forms, the common dextrorotatory form (dextroglucose, or -glucose) occurring in many fruits , animal tissues and fluids, etc., and having a sweetness about one half that of ordinary sugar, and the rare levorotary form (lavoglucose, or -glucose) not naturally occurring.
Chemical reaction: Reaction, the reciprocal action of chemical agents upon each other; chemical change.
Protein: Any of numerous, highly varied organic molecules constituting a large portion of the mass of every life form and necessary in the diet of all animals and other nonphotosynthesizing organisms, composed of 20 or more amino acids linked in a genetically controlled linear sequence into one or more long polypeptide chains, the final shape and other properties of each protein being determined by the side chains of the amino acids and there chemical attachments: proteins include such specialized forms as collagen for supportive tissue, hemoglobin for transport, antibodies for immune defense, and enzymes for metabolism.
Amino acids: Any of a class of organic compounds that contains at least one amino group, -NH2, and one carboxyl, -COOH: the alpha-amino acids, RCH(NH2)COOH, are the building blocks from which proteins are constructed.
Answer:
Chemical reactions would slow down and even not proceed at all without enzymes.
Explanation:
Enzymes are protein catalysts, meaning they speed up chemical...
What units are represented by the numbers marked on the meterstick.
Answer:
Centimeters
Centimeter
⇒ metric unit of length equal to 0.01 (1/100) of a meter
A hydrate of zinc nitrate has the formula Zn(NO3)2 . xH2O. If the mass of 1 mol of anhydrous zinc nitrate is 63.67% of the mass of 1 mol of the hydrate, what is the value of x?
MM Zn(NO₃)₂ = 189.36 g/mol
mass 1 mol Zn(NO₃)₂ = 189.36 g
mass hydrate = 100 / 63.67 x 189.36 = 297.409 g
mass 1 mol hydrate = 297.409 g
MM hydrate = 297.409 g/mol
MM hydrate = MM Zn(NO₃)₂ + MM xH₂O
297.409 = 189.36 + x(18)
x = 6
2.3 moles of CaBr2 contains how many molecules
Avogadro's law states that in every mole of a substance, there are [tex]6.022 \times 10^{23}[/tex] molecules.
This means that in 2.3 moles, there are [tex]2.3(6.022 \times 10^{23})=\boxed{1.4 \times 10^{24} \text{ (to 2 sf)}}[/tex]
some one please help me
Answer:
measure their densities
How many grams Fe2O3 would be
required to make 187 g Fe?
Fe₂O3 + 3CO → 2Fe + 3CO₂
266.63g of Fe2O3 would be required to make 187 g Fe in accordance with the following equation: Fe₂O3 + 3CO → 2Fe + 3CO₂.
How to calculate mass?The mass of a product or reactant can be calculated using stoichiometry as follows:
According to this question, iron oxide reacts with carbon monoxide as follows:
Fe₂O3 + 3CO → 2Fe + 3CO₂
1 mole of Fe2O3 produces 2 moles of Fe
Moles of Fe = 187/56 = 3.34mol
3.34/2 = 1.67 moles of Fe2O3 will be required to produce 3.34 moles of Fe.
mass of Fe2O3 = 1.67 mol × 159.69 g/mol = 266.63g
Therefore, 266.63g of Fe2O3 would be required to make 187 g Fe in accordance with the following equation: Fe₂O3 + 3CO → 2Fe + 3CO₂.
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A 25.0 g sample of metal at
16.0 °C is warmed to 22.1 °C
by 259 J of energy.
What is the change in temperature
for the metal?
The answer to this question is change in temperature will be 6.1 and specific specific heat capacity of metal will be 1698.36.
According to the formula of Calorimetry
Q = msΔT
where, Q = Quantity of heat absorbed (in joules)
M = Mass of water sample given (in kilogram)
S = specific heat capacity of metal
ΔT = Change in temperature
We have given,
Mass as 25 gram which is equal to 0.025 Kg.
Change in temperature as 6.1
Quantity of heat absorbed as 259 J
Applying to the formula of Calorimetry
Q = msΔT
259 = 0.025 × s × 6.1
s = 1698.36
So, specific heat capacity of metal came out to be 1698.36 and the change in temperature will be 6.1
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Answer: specific heat is 1.7
Explanation:
after you answer this question itll then tell you to find the specific heat
functions of intercalary meristems
What is the volume in L of a 0.825 mole sample of Ar at 600 mm Hg and 300 K?
Answer:
V = 25.7 L
Explanation:
To find the volume of Argon (Ar), you need to use the Ideal Gas Law equation. This looks like:
PV = nRT
In this formula,
> P = pressure (atm)
> V = volume (L)
> n = number of moles
> R = constant (0.0821 L*atm/K*mol)
> T = temperature (K)
While there is a different constant that can be used if you want to keep the pressure in mmHg, there is a more common constant used when the pressure is in atm. So, to find the volume, you need to (1) convert mmHg to atm (by dividing by 760) and then (2) calculate the volume (using Ideal Gas Law).
(Step 1)
600 mm Hg 1 atm
------------------- x --------------------- = 0.789 atm
760 mm Hg
(Step 2)
PV = nRT
(0.789 atm) x V = (0.825 mole)(0.0821 L*atm/K*mol)(300 K)
(0.789 atm) x V = 20.32
V = 25.7 L
The Oxidation number of iron in the Complexion [Fe(CN) 6]³^- is what?
+3
Hence, the magnetic behaviour of the complex is paramagnetic. The oxidation number of the central metal atom: The oxidation number of the metal iron is +3.
Answer:
the oxidation number of iron in the complexion is +3 or x=+3
Calculate how many grams would be required to prepare 600. 0 ml of 0. 150 m of naf? molar mass of naf is 41. 9 g/mo
Considering the definition of molarity and molar mass, the mass of NaF required is 3.771 grams.
Definition of molarityMolar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:
[tex]molarity=\frac{number of moles}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liters}[/tex].
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Mass of NaF requiredIn this case, you know:
molarity= 0.15 M= 0.15 [tex]\frac{moles}{L}[/tex]number of moles= ?volume= 600 mL= 0.6 LReplacing in the definition of molarity:
[tex]0.15\frac{moles}{L} =\frac{number of moles}{0.6 L}[/tex]
Solving:
0.15 [tex]\frac{moles}{L}[/tex] × 0.6 L= number of moles
0.09 moles= number of moles
The molar mass of NaF is 41. 9 g/mol. So, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 41.9 grams, 0.09 moles of the compound contains how much mass?
[tex]mass=\frac{0.09 molesx41.9 grams}{1 mole}[/tex]
mass= 3.771 grams
Finally, the mass of NaF required is 3.771 grams.
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