Name: ________________________ Class: ___________________ Date: __________
ID: A
Ch.13 Test
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. How do substances form during a chemical reaction?
a. One or more substances are combined.
b. Chemical bonds in molecules add atoms to make more molecules.
c. A solid substance is formed in a solution.
d. Chemical bonds break, atoms rearrange, and new chemical bonds form.
____
2. The fizz in a carbonated beverage comes from carbonic acid. The formula for carbonic acid is H2CO3. How
many oxygen atoms are in one molecule of carbonic acid?
a. 1
c. 3
b. 2
d. 4
____
3. What is/are the product(s) in this chemical formula? N + O2 → NO2
a. N
c. O2
b. N and O2
d. NO2
____
4. Some spoons are made with the element silver (Ag). Over time, these spoons will turn black if it is not
cleaned with a special solution. Which of the following statements best explains why the element silver in the
spoons turns black?
a. It absorbs energy when exposed to warm c. It reacts with substances in the air to
food.
form a new substance.
b. It breaks down into smaller and smaller
d. It changes from one phase of matter into
particles.
another phase of matter.
____
5. In a single-displacement reaction,
a. a more reactive element can replace a less reactive element.
b. only metals and nonmetals can react.
c. a less reactive element can replace a more reactive element.
d. most often nonmetals are involved.
____
6. Which of the following is NOT an example of a chemical reaction?
a. milk turning sour
c. a match burning
b. food being digested
d. ice melting
____
7. Which of the following is NOT an element that forms a diatomic molecule?
a. oxygen
c. hydrogen
b. helium
d. chlorine
____
8. Which example shows where coefficients are used correctly to balance the equation?
c. 2P4O10 + 3H2O → 2H3PO4
a. 1P4O10 + 24H2O → 8H3PO4
b. 1P4O10 + 4H2O → 4H3PO4
d. 1P4O10 + 6H2O → 4H3PO4
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Name: ________________________
____
ID: A
9. The correct chemical formula for tetrasulfur heptoxide is
c. S4O7
a. 3SO6
b. 7OS4
d. S7O6
____ 10. The correct name for Al2S3 is
a. dialuminum trisulfur
b. aluminum sulfide
c.
d.
dialuminum trisulfide
aluminum sulfur
____ 11. Which of the following lowers the activitation energy in a chemical reaction?
a. increasing the temperature
c. increasing the concentration
b. adding a catalyst
d. removing an inhibitor
____ 12. Balancing a chemical equation so that the same number of atoms of each element is found in both the
reactants and the products is an example of
a. activation energy.
c. the law of conservation of mass.
b. the law of conservation of energy.
d. a double-displacement reaction.
____ 13. Which of the following equations is best illustrates the law of conservation of mass?
a. Mg(OH)2 + HCl → MgCl2 + H2O
c. Mg(OH)2 + 2HCl → MgCl2 + 2H2O
b. 2Mg(OH)2 + 6HCl → 2MgCl2 + 3H2O
d. Mg(OH)2 + 6HCl → 3MgCl2 + 3H2O
____ 14. The correct compound name for Se2Cl4 is
a. selemium chlorine
b. selenium chloride
c.
d.
____ 15. Which of these is a sign of chemical reaction?
a. change in state
c.
b. ice pellets
d.
diselenium tetrachloride
diselenium pentachloride
energy is absorbed
solid precipitate
____ 16. What does a prefix in the nomenclature of chemical compound indicate?
a. number of atoms
c. number of molecules
b. number of protons
d. number of elements
____ 17. Which of the following is a source of activation energy?
a. light
d. answers A and B
b. friction
e. all of the above
c. reactivity with water
____ 18. The only factor that has an indirect relationship with the rate of a reaction is ____________.
a. a catalyst
c. heat added
b. an inhibitor
d. an electric spark
____ 19. What is unique about a catalyst?
a. It changes the rate of a reaction without
actually becoming a part of the reaction.
b. It changes the rate of a reaction by
becoming a reactant in the reaction.
c.
d.
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It decreases the rate of the reaction by
lowering the activation energy.
It lowers the activation energy by
becoming a reactant in the reaction.
Name: ________________________
ID: A
____ 20.
The picture above shows a light stick. Light sticks begin to glow when the vial inside the stick is
broken. Chemicals inside the vial mix with chemicals outside of the vial. Which of the following
statements BEST supports the idea that a chemical reaction, rather than a physical change, is
occurring?
a.
The vial is broken into smaller pieces. c.
b.
Energy is released in the form of light. d.
Two different substances are
combined.
The substances are in a flexible
container.
Matching
Match each item with the correct statement below. Some answer choices may be used more than once!
a. synthesis reaction
c. single-displacement reaction
b. decomposition reaction
d. double-displacement reaction
____ 21. two or more substances combine to form one new compound
____ 22. one element replaces another element in a compound
____ 23. ions from two compounds exchange places
____ 24. one compound breaks down to form two or more substances
____ 25. H2S + Cl
____ 26. Mg + N
S8 + HCl
Mg3N2
____ 27. Fe2O3 + CO → Fe + CO2
____ 28. H2CO3 → H2O + CO2
____ 29. 2Na + Br2 → 2NaBr
____ 30. BaCl2 + K2(SO4) → Ba(SO4) + 2KCl
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Name: ________________________
ID: A
Match each example of a chemical reaction with the proper sign that gives evidence for a chemical change in
that reaction. Answer choices may be used more than once.
a. gas formation
c. precipitate formation
b. energy release
d. color change
____ 31. result of using vinegar to make a dull penny shine again
____ 32. product of an exothermic reaction
____ 33. when this results in a chemical reaction, it may stay suspended in a solution or settle to the bottom of the
container
____ 34. result of combining baking soda with vinegar
____ 35. result of lightning
Identify each equation, diagram, and process below as one of the following types of reactions.
a. endothermic reaction
b. exothermic reaction
____ 36. 6CO2 + 6H20 + energy --> C6H12O6 + 602
____ 37. C3H8 + 5O2 --> 3CO2 + 4H2O + energy
____ 38.
____ 39.
____ 40. This reaction requires a greater amount of activation energy.
____ 41. Condensation
____ 42. Photosynthesis
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Name: ________________________
ID: A
Short Answer
43. 3-POINT QUESTION:
1) Rewrite the chemical equation below using the chemical formulas. Then answer the following questions.
sodium fluoride
bromine
sodium bromide
2) Balance the equation.
3) Identify the type of chemical reaction represented.
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fluorine