Name: ________________________ Class: ___________________ Date: __________
ID: A
Compounds are Classified in Different Ways
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement tr ue.
____
1. Aqueous solutions containing HCl, H 2SO4, and CH3COOH will each have a pH value higher than
that of pure water.
____
2. Aqueous solutions containing sodium hydroxide and potassium oxide will each have a pH value
higher than 7.
Multiple Choice
Identify the choice that best completes the statement or answers the question.
Use the following unbalanced chemical equation to answer the next two questions.
A small amount of baking soda and dilute sulfuric acid is placed into a 1.0 L flask, and the following
unbalanced reaction occurs:
NaHCO3(s) + H2SO4(aq) → Na2SO4(aq) + H2O(l) + CO2(g)
____
3. The coefficients that balance the formula equation, in order from left to right, are:
a. 1, 2, 1, 2, 1
c. 2, 1, 2, 1, 2
b. 2, 1, 1, 2, 2
d. 1, 2, 2, 1, 1
____
4. Which of the following arrangements would provide the best data to support the law of conservation
of mass for the reaction?
a. an open flask
b. an open flask on a digital scale
____
c.
d.
a closed flask
a closed flask on a digital scale
5. Consider the following skeleton equation for the production of ammonia. When the equation is
balanced, how many atoms of hydrogen appear on each side of the chemical equation?
N2 + H2 → NH3
a. two
b. three
c.
d.
1
six
eight
Name: ________________________
ID: A
Use the following information to answer the next two questions.
Methane, a component of natural gas, burns in oxygen gas to produce carbon dioxide and water
according to the following diagram:
____
6. When the formula equation representing the reaction is balanced, the coefficients that appear in the
balanced equation, from left to right, are:
a. 1, 2, 2, 1
b. 2, 1, 2, 1
____
c.
d.
2, 1, 1, 2
1, 2, 1, 2
7. A student tests some household vinegar (a solution of acetic acid) using several different indicators.
Which of the following represents the results expected for the indicators listed?
Phenolphthalein
pink
colourless
colourless
pink
a.
b.
c.
d.
a.
a
Bromothymol Blue
blue
blue
yellow
yellow
b.
b
Litmus
red
blue
red
blue
c.
c
Methyl Red
yellow
red
red
yellow
d.
Indigo Carmine
blue
yellow
blue
yellow
d
____
8. Which of the following liquids/solutions is most likely to have the highest pH?
a. HCl (aq)
c. H2O (l)
b. CH3COOH (aq)
d. KOH (aq)
____
9. Which of the following acids has a formula containing only two elements?
a. hydroiodic acid
c. perchloric acid
b. sulfuric acid
d. nitrous acid
2
Name: ________________________
ID: A
____ 10. Which compounds below could represent the reactants in a neutralization reaction?
I.
II.
III.
IV.
a.
b.
NaOH
H3PO4
NaNO3
H 2O
I. and II.
I. and III.
c.
d.
II. and III.
III. and IV.
____ 11. Oxides produced from which of the following elements contribute to acid precipitation?
I.
II.
III.
IV.
a.
b.
sodium
sulfur
nickel
nitrogen
I. and II. only
I., III., and IV. only
c.
d.
I. and III. only
I. and IV. only
____ 12. An organic compound must contain the element:
a. nitrogen
c. carbon
b. hydrogen
d. oxygen
____ 13. Which of the following is not composed of organic compounds?
a. vegetable oil
c. table salt
b. gasoline
d. candle wax
____ 14. Which of the following data would correctly apply to a concentrated solution of
hydrochloric acid?
a.
b.
c.
d.
a.
pH Value
low
low
high
high
a
H+ Concentration
high
low
low
high
b.
b
OH- Concentration
low
high
high
low
c.
3
c
Methyl Orange Colour
red
red
yellow
yellow
d.
d
Name: ________________________
ID: A
____ 15. Which of the following sets of indicator and pH data matches the aqueous solution listed?
Aqueous Solution pH
Value
H2SO4
NaOH
H2SO4
NaOH
a.
b.
c.
d.
a.
a
b.
b
Litmus
Colour
blue
red
red
blue
Methyl Orange
Colour
yellow
yellow
red
red
c.
c
Approximate pH
Value
12
2
2
12
d.
d
____ 16. A solution is found to have an H + ion concentration 10 000 times lower than that of pure water.
Which of the following conclusions would correspond to this observation?
a. a basic solution with a pH of 11
c. an acidic solution with a pH of 11
b. an acidic solution with a pH of 3
d. a basic solution with a pH of 3
____ 17. Which of the following common household solutions is most likely to have the hydroxide ion in its
chemical formula?
a. milk
b. lemon juice
c.
d.
vinegar
oven cleaner
____ 18. Which of the following acids have chemical formulas containing the same number of oxygen atoms?
I.
II.
III.
IV.
a.
b.
chloric acid
sulfurous acid
phosphoric acid
nitrous acid
I. and II.
I. and III.
c.
d.
II. and III.
II. and IV.
____ 19. When each of the compounds listed below are dissolved in pure water, which of them will change
the pH of the water the least?
I.
II.
III.
IV.
a.
b.
KNO3
HNO3
Sr(OH)2
SrCl2
I. and II. only
I. and III. only
c.
d.
4
III. and IV. only
I. and IV. only
Name: ________________________
ID: A
____ 20. Which of the following will produce an acidic solution when added to water?
a. SO2
c. NaCl
b. K2O
d. CaO
____ 21. Which of the following is an organic compound?
a. sulfuric acid
c. calcium carbonate
b. methane
d. sodium oxalate
Short Answer
22. First, write out the word equation for a neutralization reaction. Then, write out the balanced formula
equation for the neutralization that occurs when sulfuric acid reacts with calcium hydroxide.
Problem
23. Complete the table below.
Chemical Name
sodium hydroxide
Chemical Formula H+ vs. OHH+ < OHH3PO4
Bromothymol Blue Colour
hydrobromic acid
Sr(OH)2
CH3COOH
24. Two clear, colourless aqueous solutions appear identical. One is a concentrated solution of HCl, and
the other is a concentrated solution of NaOH. Describe three safe methods to distinguish these
solutions from each other. (Use no more than one chemical indicator in your answer). A bonus mark
will be awarded for answers containing more than three methods.
25. Write balanced formula equations for the following neutralization reactions:
a) H2SO4 + Ca(OH)2 →?
b) H3PO4 + LiOH → ?
c) H2CrO4 + Al(OH)3 → ?
5
ID: A
Compounds are Classified in Different Ways
Answer Section
MODIFIED TRUE/FALSE
1. ANS: F
Aqueous solutions containing HCl, H 2SO4, and CH3COOH will each have a pH value lower than
that of pure water.
PTS:
KEY:
2. ANS:
LOC:
MSC:
1
acids | pH
T
C2-2, 5
H
DIF: Average
MSC: U
LOC: C2-2, 3, 4
PTS: 1
TOP: Acids and Bases
TOP: Acids and Bases
DIF: Difficult
KEY: bases | pH
MULTIPLE CHOICE
3. ANS:
TOP:
MSC:
4. ANS:
TOP:
MSC:
5. ANS:
TOP:
MSC:
6. ANS:
TOP:
MSC:
7. ANS:
TOP:
MSC:
8. ANS:
TOP:
MSC:
9. ANS:
TOP:
10. ANS:
TOP:
11. ANS:
TOP:
12. ANS:
TOP:
13. ANS:
TOP:
B
PTS:
Chemical Equations
U
D
PTS:
Chemical Equations
K
C
PTS:
Chemical Equations
U
D
PTS:
Chemical Equations
U
C
PTS:
Acids and Bases
U
D
PTS:
Acids and Bases
U
A
PTS:
Acids and Bases
A
PTS:
Salts
KEY:
C
PTS:
Salts
KEY:
C
PTS:
Organic Compounds
C
PTS:
Organic Compounds
1
DIF: Average
LOC: C4-3
KEY: balanced chemical equations
1
DIF: Easy
LOC: C4-1
KEY: conservation of mass
1
DIF: Average
LOC: C4-3
KEY: balanced chemical equations
1
DIF: Average
LOC: C4-2, 3
KEY: balanced chemical equations
1
DIF: Average
LOC: C2-1
KEY: acids | bases | pH indicators
1
DIF: Average
LOC: C2-2, 3
KEY: pH | acids | bases
1
DIF: Average
KEY: binary acids
DIF: Average
1
neutralization
1
DIF: Average
salts
MSC: U
1
DIF: Easy
KEY: organic
1
DIF: Easy
KEY: organic
1
LOC:
MSC:
LOC:
MSC:
LOC:
C2-4
K
C2-3, C4-4
U
C2-5
LOC:
MSC:
LOC:
MSC:
C3-1
K
C3-1
K
ID: A
14. ANS:
TOP:
MSC:
15. ANS:
TOP:
MSC:
16. ANS:
TOP:
17. ANS:
TOP:
18. ANS:
TOP:
19. ANS:
TOP:
20. ANS:
TOP:
21. ANS:
TOP:
A
PTS:
Acids and Bases
U
C
PTS:
Acids and Bases
H
A
PTS:
Acids and Bases
D
PTS:
Acids and Bases
A
PTS:
Acids and Bases
D
PTS:
Salts
KEY:
A
PTS:
Salts
KEY:
B
PTS:
Organic Compounds
1
DIF: Average
LOC: C2-1, 2, 3
KEY: acids | bases | pH
1
DIF: Difficult
LOC: C2-1, 3
KEY: pH indicators
1
DIF:
KEY:
1
DIF:
KEY:
1
DIF:
KEY:
1
DIF:
acids | bases | salts
1
DIF:
salts
MSC:
1
DIF:
KEY:
Difficult
pH
Average
bases
Average
acids
Difficult
Average
K
Average
organic
LOC:
MSC:
LOC:
MSC:
LOC:
MSC:
LOC:
MSC:
LOC:
C2-2
H
C2-2
U
C2-4
U
C2-3
H
C2-5
LOC: C3-2, 3
MSC: U
SHORT ANSWER
22. ANS:
The word equation for a neutralization reaction is: Acid + Base ? Salt + Water. The formula equation
for the neutralization that occurs when sulfuric acid reacts with calcium hydroxide is: H2SO4 +
Ca(OH)2 → CaSO4 + 2 H2O.
PTS: 4
TOP: Salts
DIF: Average
LOC: C2-3, C4-3, 4
KEY: neutralization
MSC: H
PROBLEM
23. ANS:
Chemical Name
sodium hydroxide
phosphoric acid
hydrobromic acid
strontium hydroxide
acetic acid
Chemical Formula
NaOH
H3PO4
HBr
Sr(OH)2
CH3COOH
PTS: 7
DIF: Difficult
KEY: acids | bases | indicators
H+ vs. OHH+ < OHH+ > OHH+ > OHH+ < OHH+ > OH-
LOC: C2-2, 3
MSC: H
2
Bromothymol Blue Colour
blue
yellow
yellow
blue
yellow
TOP: Acids and Bases
ID: A
24. ANS:
The methods that can be used to distinguish the two solutions from each other include the following:
(3 Points)
i) Test the pH values of both solutions. The pH of the HCl solution will be well below 7, and the pH
of the NaOH solution will be well above 7.
ii) Add the indicator bromothymol blue to each solution. The HCl solution will be yellow, and the
NaOH solution will be deep blue.
iii) Into each solution place a small strip of magnesium. The magnesium will react with the HCl
solution to produce hydrogen gas but will not react at all with the NaOH solution.
Bonus Method: To each solution, add a small amount of baking soda (or carbonate salts). The HCl
solution will react to produce carbon dioxide gas, and the NaOH solution will not react at all. (+1
Bonus Point)
PTS: 4
KEY: acids | bases
25. ANS:
DIF: Average
MSC: H
LOC: C2-1, 2, 3
TOP: Acids and Bases
a) H2SO4 + Ca(OH)2 → CaSO4 + 2 H2O
b) H3PO4 + 3 LiOH → Li3PO4 + 3 H2O
c) 3 H2CrO4 + 2 Al(OH)3 → Al2(CrO4)3 + 6 H2O
PTS: 6
DIF: Difficult
KEY: neutralization
LOC: C2-3, C4-4
MSC: H
3
TOP: Salts