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Eddi Din [679]
3 years ago
10

1.)If you are given the number of particles in a substance sample, what is the first step you should take to determine how many

grams are present in that sample?
Find the molar mass of the substance.

Convert the grams to particles.

Convert the moles to mass.

Convert the number of particles to moles.


2.)Phosphoric acid, which is a component of many soft drinks, has a molar mass of 98.00 grams per mole. A sample of phosphoric acid contains 3.1 percent hydrogen, 31.6 percent phosphorus, and 65.3 percent oxygen by mass. What is the molecular formula of phosphoric acid?

HPO

H2PO2

H3PO4

H6P2O8


3.)Which of the following cannot occur in a chemical reaction?

New atoms are created.

Heat is released.

Light is produced.

Temperature is changed.


4.)What information do the coefficients in a balanced chemical equation tell you?

The amount of energy from the products.

The ratios of the number of moles of each substance that react and that are produced.

The physical states of the compounds reacting.

The elements involved in the reaction.


5.)Which law states that, in chemical reactions, the total mass of reactants must equal the total mass of the products?

conservation of molecules

conservation of energy

conservation of mass

conservation of elements


6.)How do you know if an equation is balanced?

All substances in the equation have written coefficients.

The reactant and product coefficient totals are equal.

The number of atoms for every element is equal on both sides of the equation.

All coefficients are divisible by two.


7.)In a reaction, 15 moles of carbon dioxide are produced from 5 moles of iron (III) oxide and 15 moles of carbon monoxide. What is the mole ratio of carbon dioxide to carbon monoxide?

15:5

5:15

1:3

1:1


8.)What is the mole ratio of C3H8 to carbon dioxide in the following equation?

C3H8 + 5O2 à 3CO2 + 4H2O

3:03

11:06

1:03

24:06:00


9.)Two moles of hydrogen gas is reacted with oxygen gas to produce water in this reaction:

2 H2 + O2 → 2 H2O

In the lab you actually made 33.1 grams of water. What is the percent yield?

108.10%

91.80%

5.50%

100%
Chemistry
1 answer:
alekssr [168]3 years ago
8 0

Answer:

1-Find the molar mass of the substance.

2-H3PO4

3-New atoms are created.

4-The ratios of the number of moles of each substance that react and that are produced.

5-conservation of mass

6-The number of atoms for every element is equal on both sides of the equation.

7-1:1

8-1:03

9-5.50%

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The substance that conducts electricity is NaCl dissolved in water.

So, option A is correct one.

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Be sure to answer all parts.
sergey [27]

The  moles of O2 are needed to react completely with 1.00 mol of C₂H₂ is 5 mol , 0.23  moles of C₂H₂ are needed to form 0.46 mol of CO₂ .

<h3>What is a Balanced Reaction ?</h3>

A balanced reaction is a reaction in which the number of atoms present in the reactants is equal to the number of atoms in the products.

It is given in the question that

the combustion of Acetylene is given by

2 H―C≡C―H + 5 O₂ → 4 CO₂ + 2 H₂O

Given moles of Acetylene = 1 mol

Moles of oxygen needed = 5 mol

as the mole fraction of Acetylene to Oxygen is 1 :5

The mole of Acetylene needed to form 0.46 mol of CO₂ is ?

mole fraction of CO₂ to Acetylene is 4:2

Therefore 0.23 moles of CO₂ is required.

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Why did Boyle think that chemistry was the key to understanding?
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Answer:

Explanation:

Boyle believed that chemistry – the behavior of substances – could be explained through the motion of atoms, which in turn could be understood through mechanics – Galileo's mathematics of motion. Boyle was ultimately proved correct, because today we can understand chemistry mathematically, through quantum mechanics.

8 0
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