Honors Physical Science Chapter 23 Test Review
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____ 1. A(n) ____ chemical equation has the same number of atoms of each element on each side of the equation.
a. | balanced | c. | simple |
b. | complex | d. | unbalanced |
____ 2. Each substance on the left side of the arrow in a chemical equation is a ____.
a. | catalyst | c. | product |
b. | coefficient | d. | reactant |
____ 3. Which of the following is a balanced chemical equation?
a. | AgNO3 + NaCl ® 4AgCl + 2NaNO3 |
b. | 2AgNO3 + 2NaCl ® 3AgCl + 2NaNO3 |
c. | AgNO3 + NaCl ® AgCl + NaNO3 |
d. | AgNO3 + 2NaCl ® AgCl + 3NaNO3 |
____ 4. The energy required to break the original bonds is less than the energy release when new bonds form in a(n) ____ reaction.
a. | endergonic | c. | precipitate |
b. | exergonic | d. | aqueous |
____ 5. If heat must be added to a chemical reaction for the reaction to take place, the reaction is ____.
a. | balanced | c. | exothermic |
b. | endothermic | d. | reactant |
____ 6. What type of reaction is shown in the following chemical equation: NH3 + HCl ® NH4Cl?
a. | decomposition | c. | single-displacement |
b. | double-displacement | d. | synthesis |
____ 7. Which of the following could represent a decomposition reaction?
a. | compound = element + element |
b. | compound + compound = compound + compound |
c. | element + compound = element + compound |
d. | element + element = compound |
____ 8. In a chemical equation, the symbol that means dissolved in water is ____.
____ 9. When one element replaces another element in a compound, the reaction is a ____ reaction.
a. | decomposition | c. | single–displacement |
b. | double–displacement | d. | synthesis |
____ 10. A substance that speeds up a chemical reaction without being permanently changed itself is a(n) ____.
a. | catalyst | c. | inhibitor |
b. | coefficient | d. | reactant |
____ 11. The breaking down of a substance into two or more simpler substances is ____.
a. | decomposition | c. | a catalyst |
b. | displacement | d. | synthesis |
____ 12. Each substance to the right of the arrow in a chemical equation is a(n) ____.
a. | catalyst | c. | reactant |
b. | inhibitor | d. | product |
____ 13. Substances that prevent, or slow down, chemical reactions are called ____.
a. | catalysts | c. | inhibitors |
b. | endothermics | d. | products |
____ 14. A chemical reaction in which heat energy is released is ____.
a. | endothermic | c. | flammable |
b. | exothermic | d. | a formula |
____ 15. Numbers that precede symbols and formulas in a chemical equation are ____.
a. | catalysts | c. | superscripts |
b. | coefficients | d. | subscripts |
____ 16. According to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?
a. | There is no relationship. |
b. | The mass of the products is greater. |
c. | The mass of the reactants is greater. |
d. | The masses are equal. |
____ 17. What is an insoluble compound that forms during a chemical reaction?
a. | aqueous | c. | inhibitor |
b. | catalyst | d. | precipitate |
____ 18. A chemical reaction in which two or more substances combine to form another substance is called a ____.
a. | synthesis reaction | c. | product |
b. | decomposition reaction | d. | reactant |
____ 19. According to the law of conservation of mass, if two atoms of hydrogen are used as a reactant, how many atoms of hydrogen must be part of the product?
____ 20. What type of reaction is shown in the following chemical equation: 2H2O ® 2H2 + O2?
a. | decomposition | c. | single–displacement |
b. | double–displacement | d. | synthesis |
____ 21. The burning of wood in a campfire that produces heat and light would be both an ____ and an ____ reaction.
a. | endergonic, exothermic | c. | endergonic, endothermic |
b. | exergonic, endothermic | d. | exergonic, exothermic |
____ 22. When most chemical reactions take place, some ____ in the reactants must be broken, a process that requires energy.
a. | compounds | c. | precipitates |
b. | chemical bonds | d. | products |
Matching
Match each of the models with the type of reaction it represents.
____ 23. single–displacement
____ 24. decomposition
____ 25. double–displacement
____ 26. synthesis
Completion
Complete each statement.
Figure 21-1
27. In the chemical equation shown in Figure 21-1, the substances in part A are called ____________________.
28. In Figure 21-1, the substances in part B are called ____________________.
29. In Figure 21-1, part C is called a(n) ____________________.
30. In Figure 21-1, part D is called a(n) ____________________.
31. In Figure 21-1, part E means that the material, O, is a(n) ____________________.
32. Figure 21-1, part F, is read as ____________________.
33. Figure 21-1, part G, means that the material, Sr(OH)2, is ____________________.
34. Figure 21-1, part H, means that the material, H2, is a(n) ____________________.
Short Answer
35. In the equation Ca(s) + 2H2O(l) ® Ca(OH)2(aq) + H2(g), list each element used as a reactant, and tell how many atoms of each are needed for this reaction.
36. Explain what is meant by a balanced chemical equation.
37. What is changed in a chemical equation to balance it? What cannot be changed?
38. What type of reaction is 2KClO3 ® 2KCl + 3O2?
39. What type of reaction is 2K + 2H2O ® 2KOH + H2?
40. What type of reaction is 2Mg + O2 ® 2MgO?
41. What type of reaction is Pb(NO3)2 + 2KI ® PbI2 + 2KNO3?
Honors Physical Science Chapter 23 Test Review
Answer Section
MULTIPLE CHOICE
1. ANS: A
2. ANS: D
3. ANS: C
4. ANS: B
5. ANS: B
6. ANS: D
7. ANS: A
8. ANS: A
9. ANS: C
10. ANS: A
11. ANS: A
12. ANS: D
13. ANS: C
14. ANS: B
15. ANS: B
16. ANS: D
17. ANS: D
18. ANS: A
19. ANS: C
20. ANS: A
21. ANS: D
22. ANS: B
MATCHING
23. ANS: D
24. ANS: A
25. ANS: B
26. ANS: C
COMPLETION
27. ANS: reactants
28. ANS: products
29. ANS: element
30. ANS: coefficient
31. ANS: liquid
32. ANS: produces, forms
33. ANS: aqueous, a solid dissolved in water
34. ANS: gas
SHORT ANSWER
35. ANS:
Ca, calcium, 1; H, hydrogen, 4; O, oxygen, 2
36. ANS:
The same number of atoms of each element are on both sides of the equation.
37. ANS:
coefficients; subscripts
38. ANS:
decomposition
39. ANS:
single–displacement
40. ANS:
synthesis
41. ANS:
double–displacement