# QUESTION 1 Which equivalence factor should you use to convert from 3.48 x 10 18 atoms of Mg to moles of Mg?

QUESTION 1

Which equivalence factor should you use to convert from 3.48 x 1018 atoms of Mg to moles of Mg?

(1 mol Mg/1 atom Mg)

(1 mol Mg/3.48 x 1018 atoms Mg)

(1 mol Mg/6.02 x 1023 atoms Mg)

(6.02 x 1023 atoms Mg/1 mol Mg)

3 points

QUESTION 2

Which equivalence factor should you use to convert from 38.2 grams of K to moles of K?

(38.2 g K/39.10 g K)

(38.2 g K/1 mol K)

(1 mol K/38.2 g K)

(1 mol K/39.10 g K)

3 points

QUESTION 3

Which equivalence factor set should you use to convert 2.68 x 1011 atoms of Ag to grams of Ag?

(2.68 x 1011 atoms Ag/1 mol Ag)(1 mol Ag/107.88 g Ag)

(1 mol Ag/2.68 x 1011 atoms Ag)(107.88 g Ag/1 mol Ag)

(1 mol Ag/6.02 x 1023 atoms Ag)(107.88 g Ag/1 mol Ag)

(2.68 x 1011 atoms Ag/6.02 x 1023 atoms Ag)(107.88 g Ag)

3 points

3 points  QUESTION 5

1. The following is an example of which type of chemical reaction?Na (s) + H2O (l)    NaOH (aq) + H2 (g)
2. Single replacement
3. Decomposition
4. Double replacement
5. Combustion

3 points

3 points

QUESTION 7

Which set of coefficients correctly balances the following chemical equation?__ AgNO3 + ___ MgCl2    ___ AgCl + ___ Mg(NO3)2

4, 2, 4, 2

1, 2, 1, 2

2, 1, 2, 1

1, 1, 1, 1

3 points

QUESTION 8

To determine the limiting reagent, it is necessary to determine which reagent produces the least amount of product.

TRUE

FALSE

2 points

QUESTION 9

Given the following chemical equation, how many moles of carbon are necessary to react with 5.52 moles of SO2?5C(s) + 2SO2 (g)    CS2 (l) + 4CO (g)

5.52 moles SO2

2.00 moles SO2

13.8 moles SO2

11.0 moles SO2

3 points

QUESTION 10

Given the following chemical equation, if 58 grams of aluminum reacts with excess chlorine gas and was found to produce 203 grams of aluminum chloride, what is the percent yield for this reaction?2Al + 3 Cl2    2AlCl3

35%

24%

71%

68%

3 points

QUESTION 11

Given the following unbalanced chemical equation, how many grams of aluminum chloride are produced when 3.00 moles of aluminum reacts with 5.30 moles of chlorine gas?___Al + ___ Cl2    ___AlCl3

471 grams

399 grams

151 grams

177 grams

3 points

QUESTION 12

Which of the following correctly describes an assumption made by the kinetic molecular theory?

Gas particles exert slight attractive and repulsive forces between each other.

During collisions between gas particles, a small amount of kinetic energy is lost.

The motion of one particle of gas is independent of the motion of other particles.

Gas pressure is the result of a loss of kinetic energy between gas molecules.

3 points

QUESTION 13

Given 482 milliliters of a gas at 37 degrees Celsius and at 1.3 atmospheres, how many moles of gas are present? (The ideal gas constant is 0.0821 L · atm/mol · K.)

2.46 x 101 moles

2.06 x 100 moles

2.06 x 10-1 moles

2.46 x 10-2 moles

3 points

QUESTION 14

Given 2.91 moles of a gas in a 500 milliliter-container, if the temperature is found to be 31 degrees Celsius, what is the pressure of the gas? (The ideal gas constant is 0.0821 L · atm/mol · K.)

1.45 x 102 atm

1.48 x 101 atm

1.45 x 10-1 atm

1.45 x 101 atm

3 points

QUESTION 15

Initially, a 55.0 liter compressible container, holding 2.4 moles of a gas, exerts a pressure of 760 millimeters of mercury at a temperature of 280 Kelvin. What is the pressure when the container is compressed to 43.0 liters, the moles of gas reduces to 1.8 moles, and the temperature changes to 36 degrees Celsius?

93.7 mm Hg

492 mm Hg

740 mm Hg

805 mm Hg

3 points

QUESTION 16

A balloon containing 0.10 moles of gas has a volume of 2.0 liters. If temperature and pressure remain constant, what will be the new volume when 0.40 moles of gas are added to the balloon?

0.50 L

1.0 L

6.0 L

8.0 L

3 points

QUESTION 17

Which of the following is NOT a characteristic of liquids?

Slightly compressible

Indefinite volume

Condensed state of matter

Conforms to shape of container

3 points

QUESTION 18

Which characteristic describes a solid ionic crystal, such as LiBr?

brittle

low melting point

soft

good electrical conductor

3 points

QUESTION 19

Which of the following phase changes only occurs in solids possessing vapor pressures above atmospheric pressure and at ambient temperature?

Condensation

Melting

Sublimation

Deposition

3 points

QUESTION 20

A small cup of water is left out on the counter. Three days later, the water is gone. Which phase change describes what has occurred?

Melting

Sublimation

Evaporation

Condensation

3 points

QUESTION 21

Which of the following is NOT a property of water?

strong surface tension

ability to dissolve polar molecules

low boiling point

high capillary action with glass

3 points

QUESTION 22

Which of the following statements regarding water is true?

Water is called the universal solvent because it dissolves everything.

Water dissolves only non-polar substances.

Water dissolves polar and ionic substances.

Water dissolves both polar and non-polar substances.

3 points

QUESTION 23

Which of the following is soluble in water?

Cu(OH)2

PbSO4

RbNO3

Ca3(PO4)2

3 points

QUESTION 24

Which of the following mixtures of reactants will NOT form a precipitate?

Zn(NO3)2 and Na2S (aq)

Rb2S (aq) and LiCl (aq)

K2CO3 (aq) and Mg(NO3)2 (aq)

Na3PO4 (aq) and AgNO3 (aq)

3 points

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