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Chapter 9 Review

Multiple Choice

1. The advantage of a balanced formula equation over a chemical word equation is the added

a. information on temperature.
b. rate of reaction information.
c. quantitative information.
d. names of reactants and products.

2. Which of the following results in a single product?

a. synthesis reaction
b. analysis reaction
c. single replacement reaction
d. double replacement reaction

3. When sodium sulfate, Na2SO4, is added to water how many ions does each formula unit form?

a. 0
b. 1
c. 2
d. 3

4. Ions can form in water solutions from

a. molecular compounds.
b. ionic compounds.
c. neither molecular nor ionic compounds.
d. either molecular or ionic compounds.

5. If a reactant or product in a chemical equation is followed by (aq) it means that the

a. substance is in adequate supply.
b. substance is in water solution.
c. reaction is a quick one.
d. equation for the reaction is balanced.

6. If an energy term appears on the right side of a chemical equation the reaction must be

a. complete.
b. incomplete.
c. exothermic.
d. endothermic.

7. In the balanced equation:  H2 + I2  => 2HI   what is the ratio of reacting hydrogen gas molecules to molecules of hydrogen iodide formed?

a. 1:1
b. 2:1
c. 1:2
d. not enough information given

8. The numbers used in a balanced chemical equation that give the relative numbers of formula units of a substance taking part in a reaction are the

a. superscripts.
b. subscripts.
c. coefficients.
d. exponents.

9. In a chemical reaction the total mass of the substances before the reaction compared to the total mass of the substances after the reaction is

a. equal.
b. usually greater.
c. usually smaller.
d. sometimes greater and sometimes smaller.

10. The new substances formed in a chemical reaction are referred to as

a. catalysts.
b. intermediates.
c. products.
d.  reactants.

B. Problems

11. How many moles of chlorine gas (Cl2) would react with 5 moles of sodium (Na) according to the following formula equation?

2Na + Cl2 => 2NaCl

12. Write the balanced form of the equation:

Cu    +     AgNO3    =>       Cu(NO3)2     +       Ag

13. Write and balance the formula equation for the reaction: 

copper(II) sulfide + oxygen => copper(II) oxide + sulfur dioxide

14. Complete and balance the equation: 

CH4    +       ____    =>       CO2         +       H2O

15. Complete and balance the formula equation for the reaction:

aluminum + iron(II) oxide => ?

16. Predict the products and balance the formula equation for the reaction:

BaCl2 + Na2SO4 => ?

C. Essay Question

17. Name the four categories of chemical reactions and include one characteristic feature of each category.

A. Multiple Choice

18. The additional quantity that must be balanced in an ionic equation is the number of

a. positive and negative charges
b. moles.
c. molecules.
d. atoms.

19. A net ionic equation does not include any

a. net charges on either side.
b. spectator ions.
c. coefficients.
d. aqueous ions.

B.  Problems

20. Write the balanced net ionic equation for the reaction:

K2CO3  +    CaSO4  =>  CaCO3   +   K2SO4

21. Predict the products and write the balanced molecular equation for:

Pb   +    Cu(NO3)2   =>

22. Predict the product(s) and write the balanced equation for:

MgO(s)    +      H2O(l)   =>

23. Predict the products and write the balanced equation for:

KClO3   =>

C. Essay Question

24. For the reaction 2A + B =>  A2B describe in words two changes that take place and identify two quantities that remain the same.

 


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