CHAPTER
6
sElF-QUIZ
The following icons indicate the Achievement Chart
category addressed by each question.
For each question, select the best answer from the four
alternatives.
1. Which of the following equations is balanced?
(6.4)
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(a)
(b)
(c)
(d)
H2 + O2 → 2 H2O
Zn + 2 AgNO3 → Zn(NO3)2 + 2 Ag
N2 + H2 → NH3
PbCl2 + Li2SO4 → LiCl + 2 PbSO4
C
Knowledge/Understanding
Communication
T/I
A
Thinking/Investigation
Application
Indicate whether each of the statements is TRUE or FALSE.
If you think the statement is false, rewrite it to make it true.
5. Inabalancedchemicalequation,eachsideofthe
equation has the same number of atoms of each
element. (6.3)
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6. Equations are balanced by changing the subscripts
in the chemical formula of a substance. (6.3)
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2. Which of the following is a double displacement
reaction? (6.6)
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(a)
(b)
(c)
(d)
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2 PbO2 → 2 PbO + O2
2 Al + Fe2O3 → 2 Fe + Al2O3
N2 + 3 H2 → 2 NH3
ZnBr2 + 2 AgNO3 → Zn(NO3)2 + 2 AgBr
3. The decomposition of calcium carbonate is given
by the equation:
CaCO3(s) → CaO(s) + CO2(g)
If25gofCaCO3isheatedtogive15gofCaO,
what mass of CO2 is also produced? (6.3)
Copy each of the following statements into your notebook. Fill
in the blanks with a word or phrase that correctly completes
the sentence.
7. A ______ is a whole number that appears in
front of a chemical formula in an equation.
(6.3)
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8. In an experiment combining aluminum with
oxygen to form aluminum oxide, the aluminum
oxide is the ______ formed from the reactants.
(6.1)
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(a) 5g
(b) 10 g
(c) 15g
(d)25g
Match the general pattern on the left with the appropriate
type of chemical reaction on the right.
9. (a) A + B → AB
(i) decomposition
(b) A + BC → AC + B
4. Carbon disulfide is produced by the reaction of
carbon with sulfur dioxide. Carbon monoxide
is also formed. What is the balanced chemical
equation for this reaction? (6.4)
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(a) C + SO2 → CS2 + CO
(b) 5C+2SO2 → CS2 + 4 CO
(c) 4 C + SO → CS2 + 3 CO
(d) C + SO → CS + CO
(ii) double
displacement
(c) AB + CD → AD + CB (iii) single
displacement
(d) AB → A + B
(iv) synthesis
(e) A + O2 → AO + energy (v) combustion
(6.5,6.6,6.9)
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Write a short answer to each of these questions.
10. Consider the following chemical reaction:
CaO(s) + H2O(l) → Ca(OH)2(s) + energy
(6.1, 6.6)
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T/I
(a) What are the reactants in this reaction? How
do you know?
(b) What substance is produced in this reaction?
(c) Why is the final reaction mixture a cloudy
liquid?
(d) Will the test tube in which this reaction is
occurring become warmer or cooler during
the reaction? Explain.
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Chapter 6 • Chemicals and Their Reactions
NEL
11. When baking soda (sodium hydrogen carbonate,
NaHCO3(s)) is heated, it decomposes to form
sodium carbonate, Na2CO3(s), carbon dioxide,
and water. (6.1, 6.4)
K/U
C
(a) Write the word equation for this reaction.
(b) What evidence suggests that a chemical
change is taking place?
(c) Write a balanced chemical equation for this
reaction.
12. The following unbalanced equation represents
the formation of magnesium oxide from
magnesium and oxygen.
19. The Eiffel Tower is an iron monument located in
Paris,over150kmfromtheocean.Predicthow
the rate of corrosion would change if the Eiffel
Tower were located in a seaside town. (6.10)
T/I
20. Your family is planning to grill hamburgers in the
backyard, but it starts to rain. Someone suggests
grilling in the garage instead. Explain why it
would be risky to grill in the garage. (6.9)
C
21. Give an example of how one chemical reaction
can be beneficial in some applications and
harmful in others. (6.1–6.10)
A
Mg + O2 → MgO
Can this equation be balanced by changing the
formula of the product to MgO2? Explain.
(6.3, 6.4)
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13. List three pieces of information that can be
obtained from a balanced chemical equation.
(6.4)
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14. Compare corrosion and rusting, using specific
examples. (6.10)
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C
15. Asynthesisreactionisdefinedas“areactionin
which two reactants combine to make a larger or
morecomplexproduct.”(6.5)
C
(a) Write a definition of “synthesis reaction” in
your own words.
(b) Draw a diagram representing a typical
synthesis reaction.
16. Describe one way you could protect a bicycle
from corrosion. (6.10)
T/I
17. (a) How does the name “hydrocarbon” give clues
about the composition of hydrocarbons?
(b) Give the names and formulas of three
hydrocarbons. (6.9)
18. (a) Brieflydescribefivechemicalreactionsthat
you may encounter in a typical day.
A
(b) Choose one of the reactions and identify the
names of the products and reactants.
(6.1–6.10)
A
NEL
Chapter 6 Self-Quiz
261