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AP Chemistry Unit 4: IYKYK

Total questions: 138

Worksheet time: 6hrs 4mins

Name
Class
Date
1.

Unit 4: Combustion reactions produce what two substances?

a)

Water Vapor and Carbon Dioxide

b)

Carbon Dioxide and Oxygen

c)

Oxygen and Water Vapor

2.
CxHy +O2 --> H2O + CO2
a)
Decomposition
b)
Double replacement
c)
Combustion
d)
Single Replacement
3.
One reactant into several products.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
4.
One element replaces another in a compound.
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
5.
This pictures simulates what type of reaction?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
6.
KOH + H3PO4 --> K3PO4 + H2O
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
7.
Si + S8 --> Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
8.
Pb(NO3)2 --> PbO + NO2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
9.
Zinc reacts with steam to form zinc oxide and hydrogen. 
Zn + H2O ------> ZnO + H2   During the reaction, which substance is oxidised?  
a)
hydrogen  
b)
water  
c)
zinc            
d)
zinc oxide
10.

Which half-reaction correctly represents reduction?

a)

Ag --> Ag+ + e-

b)

F2 --> 2 F- + 2e-

c)

Au3+ + 3e- --> Au

d)

Fe2+ + e- --> Fe3+

11.

In any redox reaction, the substance that undergoes reduction will

a)

lose electrons and have a decrease in oxidation number

b)

lose electrons and have an increase in oxidation number

c)

gain electrons and have a decrease in oxidation number

d)

gain electrons and have an increase in oxidation number

12.
This is the half reaction for: 
Sn(s) → Sn4+(aq) + 4e−
a)
redox
b)
reduction
c)
oxidation
d)
neutralization
13.
What is the oxidation number of carbon in NaHCO3?
a)
+1
b)
+4
c)
-4
d)
+6
14.

What is oxidation number of Cr in Cr2O72-?

a)

-2

b)

+2

c)

+6

d)

+12

15.
What is the oxidation number of Fe in FeO?
a)
+1
b)
-1
c)
+2
d)
-2
16.
What is the oxidation number of O in CO2?
a)
+2
b)
-1
c)
+4
d)
-2
17.
What is the oxidation number of N in NO21- ?
a)
-3
b)
+4
c)
-2
d)
+3
18.
The sum of all oxidation numbers in a neutral compound is ___.
a)
0
b)
1
c)
-1
d)
depends on the compound
19.
What is the oxidation of C in CH4?
a)
-4
b)
-1
c)
+4
d)
+1
20.

What is the oxidation state of H in H2?

a)

+2

b)

+1

c)

0

d)

None of the above

21.

Reduction is the ___________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

22.

Oxidation is the _________ of electrons.

a)

loss

b)

gain

c)

sharing

d)

transfer

23.
Another name for a "oxidation-reduction" reaction is
a)
chemical reaction
b)
neutralization reaction
c)
redox reaction
d)
nuclear reaction
24.

Half-reactions can be written to represent all

a)

double-replacement reactions

b)

neutralization reactions

c)

fission and fusion reactions

d)

oxidation and reduction reactions

25.

All diatomic elements have an oxidation number of...

a)

0

b)

+1

c)

-1

d)

+2

e)

-2

26.

1. Which of the following processes involves a change in physical properties?

a)

rusting

b)

fermenting

c)

boiling

d)

burning

27.

1. The resistance of a fluid to flow is called

a)

Viscosity

b)

Energy

c)

Density

d)

Pressure

28.

1. If an object is broken in half, it will have

a)

Less density

b)

More volume

c)

More mass

d)

The same density

29.

1. As the viscosity of a liquid increases, the liquid —

a)

a. evaporates more quickly

b)

a. pours more slowly

c)

a. conducts electricity

d)

a. pours more quickly

30.

1. ____ Perfume evaporating on your skin

a)

Physical property

b)

Chemical Property

31.

A nail rusting

a)

Physical Property

b)

Chemical Property

32.

What two things are needed to find the density of an object?

a)

Mass and Velocity

b)

Mass and volume

c)

Speed and mass

33.

Is digesting food a

a)

Chemical change

b)

Physical change

c)

Neither

34.

What are the signs of a chemical change?

a)

Bubbles

b)

Gas

c)

Odor

d)

All of these

35.

Which is a physical change?

a)

dying your hair

b)

dissolving sugar in water

36.

What is the boiling point of water?

a)

100 o C

b)

O o C

c)

32 o F

d)

0 o F

37.

What are sublimation and decomposition?Choose all that apply!

a)

A subconscious suggestion and rotting

b)

Chemical changes in matter that bypass the liquid state

c)

Physical changes in matter that are solid to gas and gas to solid bypassing the liquid state

d)

Physical changes in matter that happen in subzero temperatures that can happen in your freezer and other very cold places.

38.

Match the following

a)

Physical property

1.

Color

b)

Physical property

2.

Melts at 145 °C

c)

Physical property

3.

Good conductor of heat

d)

Chemical property

4.

Burns easily (flammable)

e)

Chemical property

5.

Reacts violently with chlorine

39.

Match the following

a)

Chemical change

1.

Burning gasoline

b)

Chemical change

2.

Milk sours

c)

Chemical change

3.

Digesting food

d)

Physical change

4.

Dissolving sugar in water

e)

Physical change

5.

Ethyl alcohol evaporates

40.
What precipitate forms when you mix lead (II) nitrate with sodium chloride?
a)
sodium nitrate 
b)
lead (II) chloride 
c)
sodium lead
d)
chloride nitrate 
41.
Which is the correct net ionic equation for the reaction of AgNO3 and CaCl2?
a)
Ca2+(aq) +  2Cl- (aq) → CaCl(s)
b)
Ag+(aq)  +  Cl- (aq) → AgCl(s)
c)
Ag +  Cl  →  AgCl
d)
Ag+  +  Ca2+   →Ag2Ca (s)
42.
What are the spectator ions in the reaction of sodium chloride with silver nitrate?
a)
silver and nitrate
b)
sodium and chloride
c)
sodium and nitrate
d)
silver and chloride
43.
In this equation,
CuCl2 + NaOH  → Cu(OH)2 + NaCl
Which product is insoluble?
a)
copper(II) hydroxide
b)
sodium chloride
c)
sodium hydroxide
d)
copper(II) chloride
44.
What are the spectator ions in this reaction?
CuCl2(aq) + NaOH(aq) → Cu(OH)2(s) + NaCl(aq)
 
a)
Cu2+ and OH1-
b)
Na2+ and Cl2-
c)
Na1+ and Cl1-
d)
Na1+ and OH1-
45.
Which is the correct net ionic equation for the reaction of AgNO3 and CaCl2?
a)
Ca2+(aq) +  2Cl- (aq) → CaCl(s)
b)
Ag+(aq)  +  Cl- (aq) → AgCl(s)
c)
Ag +  Cl  →  AgCl
d)
Ag+  +  Ca2+   →Ag2Ca (s)
46.

What is the molarity of a 0.5L sample of a solution that contains 60.0 g of sodium hydroxide (NaOH)

a)

0.8 M

b)

1.5M

c)

3.0M

d)

6.0M

47.

A student is preparing solutions for a laboratory experiment by dissolving solid solutes in liquid solvents. Which action will increase the rate of solubility

a)

lowering the temperature of the solvent

b)

stirring the solute in the solution

c)

increasing the pressure on the solution

d)

increasing the particle size of the solute

48.
Which of the following substances is a homogeneous solution?
a)
chocolate chip cookie
b)
italian dressing
c)
apple juice
d)
orange juice
49.
Which of the following substances is a heterogeneous substance?
a)
baby oil
b)
rocky road ice cream
c)
salt water
d)
milk
50.

Which of the following types of solutions has more room to dissolve solute?

a)

supersaturated

b)

saturated

c)

unsaturated

51.

Which of the following is the correct formula for calculating molarity?

a)

moles/liters of solution

b)

moles/kg of solvent

c)

# particles/Avogadro's #

d)

theoretical yield/actual yield

52.

What is the molality of a solution in which 3.0 moles of NaCl is dissolved in 1.5 Kg of water?

a)

2.0 M

b)

0.22 m

c)

135 m

d)

2.0m

53.
How many liters would you need to make a 1 M solution if you have 6 mol of Sodium Hydroxide? 
a)
2
b)
3
c)
4
d)
6 
54.
True or False? The higher the concentration of a solution the less solutes it has in it.
a)
True
b)
False
55.
Which sweet tea would you expect to taste the sweetest?
a)
1M
b)
3M
c)
3.1M
d)
2.5M
56.
What is the volume in this burette?
a)
24.1mL
b)
24.3mL
c)
24.2L
d)
24.2mL
57.
Forms hydroxide ions in water
a)
Acids
b)
Bases
c)
All
58.

In acid-base titration, the equivalent point is when

a)

a certain amount of acid has reacted completely with a certain amount of base according to stoichiometry

b)

a certain amount of acid has reacted partially with a certain amount of base according to stoichiometry

59.

H2SO4 + 2NaOH --> Na2SO4 + 2H2O

How many moles of H2SO4 will neutralise 14.2 L of 0.01 mol/L NaOH?

a)

1.42 x 104 mol

b)

7.1 x 10-5 mol

c)

1.42 x 10-4 mol

d)

7.1 x 105 mol

60.

HCl + NaOH --> NaCl + H2O

What volume of 0.01 mol HCl solution will neutralise

50cm3 of 0.01 mol NaOH solution?

a)

0.25cm3

b)

25cm3

c)

50cm3

d)

100cm3

61.
Describe a solute.
a)
part of solution present in largest amount
b)
gets dissolved
c)
water
d)
surrounds and breaks apart
62.
__________ are made up of solutes and solvents.
a)
Solutions
b)
Suspensions
c)
Heterogeneous Mixtures
d)
Pure Substances
63.
You can make a solution more concentrated by adding __________.
a)
solute
b)
solvent
c)
water
64.
If I dissolve carbon dioxide in water, what is my solvent?
a)
Carbon Dioxide
b)
There is no solvent
c)
Oxygen
d)
Water
65.
NH4NO3
a)
soluble
b)
insoluble
66.
AgCl
a)
soluble
b)
insoluble
67.
FeS
a)
soluble
b)
insoluble
68.
BaSO4
a)
soluble
b)
insoluble
69.
NaC2H3O2
a)
soluble
b)
insoluble
70.

What of these is always soluble?

a)

Nitrates

b)

Phosphates

c)

Carbonates

d)

Hydroxides

71.
K2SO4
a)
soluble
b)
insoluble
72.

The word "INSOLUBLE" meaning ________

a)

Something which dissolve in water/liquid

b)

Something which cannot dissolve in water/liquid

c)

none

d)

both

73.

Which equation is a double displacement reaction?

a)

Cl2 + 2KI --> 2KCl

b)

Fe + O2 --> Fe2O3

c)

CaCO3 --> CO2 + CaO

d)

CaCO3 + 2HCl --> CaCl2 + H2CO3

74.

___ Na2CO3 + ___ Ag3P → ___ Na3P + ___ Ag2CO3

a)

3, 2, 1, 3

b)

2, 2, 2, 3

c)

3, 2, 2, 3,

d)

3, 2, 3, 2

75.

If making a cheese sandwich is represented by the following "equation": 2 Bd + Ch --> Bd2Ch

what you expect a sandwich to look like?

a)

A

b)

B

c)

C

d)

D

76.

Hydrogen gas and nitrogen gas react in a synthesis reaction to form ammonia (NH3). If the 'before' box represents the reactants, which box correctly represents the contents after the reaction is complete? (Hint: first write a balanced eqn.)

a)

A

b)

B

c)

C

d)

D

e)

E

77.

Sulfur (S) reacts with oxygen gas to form sulfur trioxide. (Write a balanced equation). Which box would be correct for the end of the reaction, given the quantities of reactants in the 'before' box?

a)

A

b)

B

c)

C

d)

D

e)

E

78.

Sulfur (S) reacts with oxygen gas to form sulfur trioxide. (Write a balanced equation). Which box would be correct for the end of the reaction, given the quantities of reactants in the 'before' box?

a)

A

b)

B

c)

C

d)

D

e)

E

79.

The diagram shown represents the reaction of red A with blue B. Write a balanced equation for this reaction.

a)

8 A + 4 B2 --> 4 A2B2

b)

2 A + 2 B2 --> 4 A2B2

c)

2 A + B2 --> A2B2

d)

2 A + B2 --> 2 A2B2

80.

The reaction represented in the boxes is the combustion of methane (CH4) in oxygen. Red = oxygen, black = carbon and white = hydrogen. Write a balanced equation. What is the limiting reactant in the picture shown?

a)

methane (CH4)

b)

oxygen (O2)

c)

carbon dioxide (CO2)

d)

water (H2O)

81.

Which of the following equations best represents the chemical reaction between phosphorous (P4) and oxygen (O2) shown?

a)

3 P4 + 10 O2 --> 4 P2O5 + P4

b)

3 P4 + 10 O2 --> 4 P2O5

c)

P4 + 5 O2 --> 2 P2O5

d)

2 P4 + 10 O2 --> 4 P2O5

e)

2 P4 + 5 O2 --> 2 P2O5 + P4

82.

Hydrogen and oxygen react explosively to form water (write the balanced equation). If the explosion is louder if more water is formed, which balloon will make the loudest noise?

a)

A

b)

B

c)

C

d)

D

83.

What is a limiting reagent in a chemical reaction?

a)

A catalyst that speeds up the reaction

b)

The product formed in the reaction

c)

The reactant that is available in excess

d)

The reactant that is completely used up first, stopping the reaction

84.

What is the result when 2.40 g of Mg reacts with 10.0 g of O2?

a)

Both react completely

b)

No reaction occurs

c)

Mg is the limiting reagent

d)

O2 is the limiting reagent

85.

What happens when the reactants are not mixed in the correct stoichiometric proportions?

a)

One of the reactants will be entirely consumed while another will be left over

b)

The reaction will not occur

c)

The reaction will produce more products

d)

All reactants will be used up completely

86.

When 12 moles of O2 reacts with 1.1 mole of C10H8 what is the limiting reactant?  C10H8 + 12 O2 --> 10 CO2 + 4 H2O

a)

Oxygen

b)

C10H8

c)

Water

d)

Carbon Dioxide

87.

Identify the limiting reagent when 6.00 g HCl combines with 5.00 g Mg to form MgCl2.
 
Mg +  2HCl --> MgCl2  +  H2   
 

a)

Mg

b)

H2

c)

MgCl2

d)

HCl

88.

Use the equation 2 Al + 3 Cl2 ---> 2 AlCl3. If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

a)

AlCl3

b)

Cl2

c)

Al

89.
What is the limiting reactant if 10 moles of NH3  react  with 30.0 moles of NO?
4NH3+6NO --> 5N2 + 6H2O
a)
NH3
b)
NO
c)
N2
d)
water
90.

What is the limiting reactant if 3 moles of H2 react with 1 mole of O2?
H2 + 0.5 O2 --> H2O

a)

H2

b)

O2

c)

H2O

91.

Using the reaction 3 Fe + 4 O2 --> 2 Fe3O4, identify the limiting reagent if 5 moles of Fe and 5 moles of O2 are used.

a)

Fe

b)

O2

c)

Fe3O4

92.

Identify the limiting and excess reactants in the reaction shown.

a)

N2 is limiting and H2 is excess. 

b)

H2 is limiting and N2 is excess. 

c)

NH3 is both limiting and excess.

d)

There is no limiting reactant. 

93.

What allows us to know when the end point has been reached?

a)

Bubbles

b)

Feels warm

c)

indicator changing color

d)

Turns to a solid

94.
acid + base ₋>
a)
salt + hydrogen
b)
salt + water
c)
salt + carbon dioxide + water
d)
salt
95.
What does pH measure?
a)
Amount of Oxygen Ions
b)
Amount of Hydrogen Ions
c)
The amount of salt in a solution
d)
The density
96.

What is this piece of apparatus called

a)

Pipette

b)

Burette

c)

Janette

d)

Cuvette

97.
A solution with a pH of 8.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
98.

Why do we perform a titration?

a)

To determine the concentration of an unknown solution

b)

To see if a reaction will occur between an acid and base

c)

To find the mass of an unknown acid

d)

To find the molar mass of an unknown solution

e)

To calculate the viscosity of the solution

99.

What are some things we will need for a titration?

a)

A solution of known concnetration

b)

A burette

c)

indicator

d)

mass balance

e)

a bunsen burner

100.

If it takes 54 mL of 0.1 M NaOH to neutralize 125 mL of an HCl solution, what is the concentration of the HCl? (record you answer with the correct unit)

a)

0.043 M

b)

0.034 M

c)

0.065 M

d)

0.77 M

101.

Which point on the titration curve corresponds to the point at which the moles of the added strong base are equal to the moles of the weak acid initially present?

a)

Q

b)

R

c)

S

d)

T

102.
I am titrating 1M HCl with 1M NaOH.  I have 25mL of HCl. How much NaOH will I need?
a)
2.5mL
b)
5mL
c)
25mL
d)
50mL
103.
I have 25mL of 1M HCl which neutralises 20mL of NaOH. What is the concentration of the NaOH?
a)
0.8 M
b)
1 M
c)
1.25 M
104.
What is the endpoint of a titration
a)
Where the amount of acid and base are balanced according to the equation
b)
Where there is no base
c)
At the end
105.

A titration curve is given below.

Which of the following statements is FALSE about this titration?

a)

The acid and base are neutralized at 50 mL

b)

Neutral salt is produced.

c)

A base is neutralized by an acid

d)

The indicator chosen should change color at pH 6-8

106.

Phenolphthalein is a pH indicator. It does not tell the exact pH. It just changes color based on whether it is in an acid or base. Which statement is true for phenolphthalein?

a)

it is colorless in acid and pink in base

b)

it is colorless in base and pink in acid

c)

it changes from green to pink

107.
If phenolphthalein turns bright pink, it indicates
a)
an acid 
b)
a base
c)
a neutral
108.

As the pH of a solution gets lower, the solution becomes more _____.

a)

acidic

b)

basic (or alkaline)

c)

neutral

d)

ionic

109.

Equal amounts of an acid and a base are mixed in a beaker. When neutralization is complete, what is in the beaker besides salt?

a)

acid only

b)

base only

c)

water

110.

Which salt is formed in a reaction between HBr and LiOH?

a)

LiBr

b)

BrLi

c)

NaCl

d)

NaOH

111.
What might happen if you mixed a strong acid with an equally strong base?
a)
You would see an explosive chemical reaction.
b)
The acid would destroy the base.
c)
The base would destroy the acid.
d)
You'd wind up with a pH-neutral substance.
112.

NH3 + H2O → NH4+ + OH-

NH3 is a Bronsted Lowry

a)

Acid

b)

Base

c)

conjugate acid

d)

conjugate base

113.

Which of the following is a neutralization reaction?

a)

2Na + Cl2 → 2NaCl

b)

CH4 + 2O2 → CO2 + 2H2O

c)

HCl + KOH → KCl + H2O

d)

CaCO3 → CO2 + CaO

114.

What is the pH of a reaction between a strong acid and strong base?

a)

0

b)

5

c)

10

d)

7

115.

HNO3 + H2O → H3O+ + NO31-

NO31- is the conjugate base of

a)

H2O

b)

HNO3

c)

H3O+

d)

none of the above

116.

HCO3- + H2O → H3O+ + CO32-

Water is acting as

a)

a Bronsted Lowry base

b)

a Bronsted Lowry acid

c)

a strong acid

d)

a weak acid

117.

HC2H3O2 + H2O → H3O+ + C2H3O21-

HC2H3O2 is acting as

a)

a conjugate base

b)

a Bronsted Lowry base

c)

a Bronsted Lowry acid

d)

none of the above

118.

What is the conjugate base of H2SO4?

a)

SO42-

b)

H2SO3

c)

HSO31-

d)

HSO41-

119.

HBr is the conjugate acid of

a)

Br1-

b)

Br2

c)

H2Br

d)

none of the above

120.

Which of the following is a strong base?

a)

NH3

b)

Zn(OH)2

c)

HCl

d)

CsOH

121.

Which of the following is a strong acid?

a)

NaOH

b)

HCl

c)

HF

d)

H2O

122.
What is the conjugate acid in the following equation?
a)
PO43- 
b)
HNO3 
c)
NO3- 
d)
HPO42-
123.
What is the conjugate base in the following reaction?
a)
HCO3- 
b)
HCl
c)
 H2CO3 
d)

Cl-

124.

How do Bronsted-Lowry conjugate acid-base pairs differ?

a)

differ by one H+

b)

Differ by one OH-

c)

Differ by two H+

d)

Differ by some number of H+

125.

Which of the following correctly identifies an acid-base pair?

a)

HCl, NaOH

b)

H2CO3 , CO32-

c)

H3O+ , OH-

d)

NH4+, NH3

126.

Which of the following correctly identifies an Acid-Base Pair?

a)

HH4+ , OH-

b)

H2O , OH-

c)

CaCO3 ,CaCl2

d)

HNO3 , H2SO4

127.

What is NH4+ classified as?

a)

Acid

b)

Base

c)

Conjugate Acid

d)

Conjugate Base

128.

Which of the following word pairs correctly completes the sentence below? _______ are corrosive substances characterized as having a strong smell, a sour taste, and are able to give up a H+ ion.

a)

Acids

b)

Amphoteric Compound

c)

Bases

d)

Electrolyte

129.
A compound that donates H+ ions is 
a)
A Bronsted-Lowry Acid
b)
An Arrhenius Acid
c)
A Bronsted-Lowry Base
d)
An Arrhenius Base
130.

An Arrhenius base:

a)

donates H+

b)

accepts H+

c)

produces H+

d)

produces OH-

131.

Which of the following show an acid and its conjugate base pair (in that order)

a)

H2SO4, SO42-

b)

OH-, H2O

c)

NH4+, H2O

d)

H2CO3, HCO3-

132.

Given the reaction above, which compound is the acid?

a)

NH3

b)

HCl

c)

NH4+

d)

Cl-

133.

Given the reaction above, which compound is the conjugate base?

a)

NH3

b)

NH4+

c)

Cl-

134.

What is NH4+ classified as?

a)

Acid

b)

Base

c)

Conjugate Acid

d)

Conjugate Base

135.

The conjugate acid of HCO3- is ___ and the conjugate base of HCO3- is ___.

a)
H2CO3; CO3-2
b)
CO3-2; CO3-2
c)
H2CO3; H2O
d)
H2O; H2CO3
136.
Which statement is true:
Mg → Mg2+ + 2e–
a)
Mg gains 2 electrons
b)
Mg2+ loses 2 electrons
c)
Mg loses 1 electron
d)
Mg loses 2 electrons
137.
Which of the following half reactions correctly represents a reduction half reaction?
a)
Fe →Fe2+ + 2e-
b)
Pb4+ + 2e- →Pb2+
c)
2O-2 →O2 + 4e-
d)
Fe + 3e- →Fe3+
138.

Cl2 + 2e- --> 2Cl - is an example of:

a)

a chemical reaction

b)

redox

c)

oxidation

d)

reduction

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