Pre-AP Chemistry Practice Test - Unit 4: Chemical ...

Pre-AP Chemistry Practice Test - Unit 4: Chemical Transformations

Question 1

Precipitation is an example of what type of reaction?

A. Single replacement

B. Metathesis (double-displacement)

C. Decomposition

D. Composition

Question 2

The precipitate in a precipitation reaction is the

A. A reactant that does not react

B. Insoluble salt that falls out of solution

C. The product that is still aqueous (aq)

D. None of the above

Question 3

When solutions of two ionic compounds are combined and a solid forms, the process is

called __________.

A. Hydration

B. Solvation

C. Dissociation

D. Precipitation

Question 4

Identify the precipitate in the equation: 2AgNO 3(aq) + Na2S(aq) --> Ag2S(s) +

2NaNO3(aq)

A. AgNO3

B. Na2S

C. Ag2S

D. NaNO3

Question 5

Which is a net ionic equation for the precipitation reaction between BaCl 2 and Na2SO4?

A. Ba2+(aq) + 2Cl-(aq) + 2 Na+(aq) + SO42-(aq) --> BaSO4(s) + 2Cl-(aq) + 2Na+(aq)

B. BaCl2(aq) + Na2SO4(aq) --> BaSO4(s) + 2NaCl(aq)

C. Na+(aq) + Cl-(aq) --> NaCl(s)

D. Ba2+(aq) + SO42-(aq) --> BaSO4(s)

Question 6

Oxidation involves

A.

B.

C.

D.

Losing electrons; gaining oxygen

Gaining electrons; gaining oxygen

Losing electrons; losing oxygen

Gaining electrons; losing oxygen

Question 7

Reduction involves

A. Gaining electrons; gaining oxygen

B. Losing electrons; losing oxygen

C. Gaining electrons, losing oxygen

D. Losing electrons; gaining oxygen

Question 8

In the reaction 2Ca(s) + O2(g) --> 2CaO(s), calcium is __________

A. Reduced

B. Oxidized

C. Synthesized

D. None of the above

Question 9

The loss of electrons or increase in the oxygen:hydrogen ratio is known as

A. Dehydration

B. Hydrogenation

C. Reduction

D. Oxidation

Question 10

Which substance is reduced in the following reaction?

NaOH + Li --> LiOH + Na

A. Li

B. O

C. H

D. Na

Question 11

If nitric acid is derived from the nitrate ion, what is the formula for nitric acid?

A. HNO3

B. H3NO3

C. HNO2

D. H2NO2

Question 12

What is the name of the acid that has the formula H2CO3?

A.

B.

C.

D.

Hydrocarbonic acid

Hydrocarbonate acid

Carbonic acid

Carbonate acid

Question 13

An Arrhenius acid must contain _____ and dissociate in aqueous solutions to produce

_____.

A. Hydrogen; hydrogen ions

B. Hydroxide; hydrogen ions

C. Hydrogen; hydroxide ions

D. Hydroxide; hydroxide ions

Question 14

By definition, a Bronsted-Lowry base is defined as:

A. A proton donor

B. A proton acceptor

C. Increases [H+]

D. Increases [OH-]

Question 15

Which of the following CANNOT act as a Bronsted acid?

A. CH4

B. H2O

C. NH3

D. Cl2

Question 16

What is the symbol for heat?

A. q

B. H

C. J

D. ¡ãC

Question 17

A process that releases heat to its surroundings

A. Endothermic

B. Radiation

C. Exothermic

D. Heat transfer

Question 18

Heat transfer through direct contact

A.

B.

C.

D.

Convection

Radiation

Conduction

Thermal

Question 19

-124 joules of heat are added to a piece of lead (C = 0.128 J/g oC). It is heated to

100.0oC, and then lowered into a calorimeter filled with water. The lead¡¯s temperature

decreases to 28.8oC. What is the mass?

A. 150 g

B. 13.6 g

C. 4 g

D. 1130 g

Answer Key

1. B

2. B

3. D

4. C

5. A

6. A

7. C

8. B

9. D

10. D

11. A

12. C

13. A

14. B

15. D

16. A

17. C

18. C

19. B

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