Answers CISD-Chemistry B-CRUnit Test

Unit Test Answers

0 verified answers

Free Preview

What is the relationship between a mole and Avogadro’s number?

A mole is the mass of Avogadro’s number of particles of a substance.

A mole is the amount of a compound that has Avogadro’s number of carbon-12 atoms in it.

A mole contains Avogadro’s number of particles of a substance.

A mole is the amount of any substance that has the same mass as Avogadro’s number of carbon-12 atoms.

Free Preview

Which statement best explains the purpose of using a mole in the measurement of matter?

It is commonly used as another unit of mass.

It allows chemists to deal with a large number of atoms.

It is used only for studying the properties of gases.

It explains that substances with the same moles have the same mass.

In a chemical reaction, substance R reacts with compound XY to produce 47.0 g of compound RX. If the theoretical yield of RX is 56.0 g, what is its percent yield?Use .

9.00%

16.1%

83.9%

119%

Consider the equation below.Zn + H2SO4 ZnSO4 + H2The mole ratio of zinc to zinc sulfate is

1:1.

1:2.

2:1.

3:1.

The balanced equation shows how sodium chloride reacts with silver nitrate to form sodium nitrate and silver chloride.NaCl + AgNO3 NaNO3 + AgCl If 4.00 g of NaCl react with 10.00 g of AgNO3, what is the excess reactant?

AgCl

NaCl

AgNO3

NaNO3

The pictures below show samples of different substances.The mass and volume of each sample differ from the mass and volume of the other samples. Is it possible for each sample to contain 1 mol of each substance?

No, because they have different masses.

No, because they have different volumes.

Yes, if each sample contains 6.02 x 1023 atoms.

Yes, if each sample contains 2 amu.

Consider the equation for the formation of water.2H2 + O2 2H2OWhat is the theoretical yield of H2O if 130 g of H2O is produced from 18 g of H2 and an excess of O2?

18 g

81 g

130 g

160 g

Nitrogen dioxide, a major air pollutant, can be produced by the combustion of nitrogen oxide as shown. 2NO + O2 2NO2 In a plant, 1,500 kg of nitrogen oxide is consumed per day to produce 1,500 kg of nitrogen dioxide per day. What is the percent yield?Use .

21.7%

32.6%

43.5%

65.2%

Consider the substances below.• 1 mol of beryllium• 1 mol of salt• 1 mol of water• 1 mol of hydrogenWhich statement is true about these substances?

They have exactly the same mass.

They have different numbers of particles.

They have the same number of atoms.

They have different masses.

Consider the balanced equation below. What is the mole ratio of PCl3 to PCl5?

1:1

2:1

3:5

5:3

The following balanced equation shows the formation of sulfur dioxide.S + O2 SO2How many moles of sulfur are needed to produce 15.0 mol of sulfur dioxide?

7.50 mol

10.5 mol

15.0 mol

30.0 mol

Consider the reaction below.2Al2O3 4Al + 3O2How many moles of oxygen are produced if 11.0 mol of Al are produced?

8.25 mol

11.0 mol

14.7 mol

16.5 mol

Did you find these answers helpful?

Unit Test Answers

More from this Course

TRY EDGENUITY HACKS