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Semester 2 Reynolds Chemistry Final Review

Total questions: 154

Worksheet time: 4hrs 25mins

Name
Class
Date
1.
Ocean acidification begins with 
a)
pollution from ships
b)
carbon dioxide released from combustion
c)
dumping of waste from cities into the ocean
2.
Carbon dioxide and seawater combine to form
a)
calcium carbonate
b)
carbon monoxide
c)
carbonic acid 
3.
Marine organisms make their shells from calcium and
a)
chloride
b)
carbonate
c)
seawater
4.
An example of a marine organism that needs calcium carbonate 
a)
a crab
b)
a shark
c)
an octopus
5.
Very slight increases in the acidity of seawater __________  marine organisms that make shells.
a)
doesn't bother
b)
has no effect on 
c)
is unhealthy and stresses
6.
Carbon dioxide levels in the air have changed throughout earth's history.  The difference today is how ______ the change is happening.
a)
rapidly 
b)
slowly 
c)
wide spread
7.

Which molecule makes water acidic?

a)

Carbonate Ions

b)

Carbon Dioxide

8.

What happens to 1/4 of the greenhouse gases in the atmosphere?

a)

It is released into space.

b)

It gets absorbed by the ocean.

9.

When carbon dioxide ions react with water, what molecules do they release?

a)

Hydrogen Ions

b)

Carbonate Ions

10.

According to this slide

a)

CO2 is causing marine life to die by "poisoning' the water

b)

CO2 is destroying sea shells

c)

CO2 is formed from the combustion of Octane

11.

This image demonstrates that

a)

There is a direct correlation with the atmospheric CO2 and the CO2 in seawater

b)

That pH of the ocean increases as the atmospheric CO2 increases

c)

That there is no correlation between pH of the ocean and atmospheric CO2

12.
As the ocean becomes more acidic, the pH of the water
a)
increases
b)
decreases
13.

What do some marine creatures do with the carbonate ion?

a)

use it as a food source

b)

use it as a defense mechanism

c)

use it to build shells and exoskeletons

d)

use it to cool body temperatures

14.

Ocean acidification makes it more difficult for marine organisms to hear each other, and predators.

a)

True

b)

False

15.

In a more acidic ocean, the shells of organisms do not grow as easily.

a)

True

b)

False

16.

Ocean acidification raises the pH of the ocean .

a)

True

b)

False

17.

Which organism might benefit from the increase of carbon dioxide in the world’s oceans?

a)

crabs and lobster

b)

Fishes

c)

Clams and oysters

d)

Sea grasses

18.

All carbon dioxide gas found in the ocean is there because humans are causing pollution from burning fossil fuels.

a)

True

b)

False

19.

The Carbon Cycle has the greatest impact on ______________ on Earth

a)

Living organisms

b)

Climate change

c)

Plants

d)

The sun

20.

Everyday processes that use oxygen - 

a)

Bacteria fixation

b)

Photosynthesis

c)

Cellular Respiration

d)

Denitrification

21.

According to NASA,

Nitrogen makes up _____% of our atmosphere.

a)

21%

b)

50%

c)

93%

d)

78%

22.

Carbon is released back into the atmosphere through _______

a)

Photosynthesis

b)

Cell Respiration

c)

Decomposition

d)

Nitrogen cycle

23.

Burning fossil fuels lead to ____________

a)

Greenhouse effect

b)

Cleaner air

c)

Less humidity

d)

Nuclear energy

24.

Deforestation causes an increase in ____________

a)

Oxygen

b)

Nitrogen

c)

Carbon dioxide

d)

Increased habitats

25.

Nitrogen goes through the process of ________ to become plant use. 

a)

Transformation

b)

Transpiration

c)

Denitrification

d)

Fixation

26.

The continuous movement of carbon among the abiotic environment and living things.

a)

nutrient cycle

b)

carbon cycle

c)

nitrogen cycle

d)

water cycle

27.

A family of plants including beans, alfalfa, and peas, most of which harbor symbiotic, nitrogen-fixing bacteria in nodules in their roots.

a)

producers

b)

legumes

c)

prokaryotes

d)

tubers

28.

The biological transformation of ammonia or ammonium to nitrites and nitrates.

a)

ammonification

b)

denitrification

c)

nitrification

d)

nitrogen fixation

29.

Bacterial action that results in the combination of atmospheric nitrogen with other elements; making nitrogen available for use by plants.

a)

ammonificaiton

b)

denitrification

c)

nitrification

d)

nitrogen fixation

30.

Which process uses bacteria?

a)

ammonification

b)

denitrification

c)

nitrification

d)

nitrogen fixation

31.

Which process releases nitrogen gas back into the atmosphere?

a)

ammonification

b)

dentirification

c)

nitrificaiton

d)

nitrogen fixation

32.

plants take in carbon dioxide to make their own food

a)

Photosynthesis

b)

Cellular Respiration

c)

Sedimentation

d)

Decomposition

33.

organisms release carbon dioxide

a)

Photosynthesis

b)

Cellular Respiration

c)

Sedimentation

d)

Decomposition

34.

decomposers break down dead organisms and return the carbon to the soil

a)

Photosynthesis

b)

Cellular Respiration

c)

Sedimentation

d)

Decomposition

35.

How does carbon in a grass plant get into a lion?

a)

The lion eats an antelope that ate the grass

b)

Carbon from grass doesn't end up in a lion.

c)

The lion absorbs the carbon given off by transpiration

d)

The lion breathes in carbon given out by the plant

36.
When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.
a)
Water
b)
Atmosphere
c)
Sun
d)
Air
37.
Which of the following add carbon dioxide to the atmosphere?
a)
volcanoes
b)
combustion of fossil fuels
c)
animal and plant respiration
d)
all of these
38.
The average temperature of the surface of Earth has increased approximately 1°C in the past century. Which reason best explains this increase in temperature?
a)
lower levels of ozone in the atmosphere
b)
lower levels of nitrogen in the atmosphere
c)
higher levels of carbon dioxide and other greenhouse gases in the atmosphere
d)
higher levels of oxygen in the atmosphere
39.
Which one of these does not add CO2 to the atmosphere?
a)
cooking with gas
b)
planting trees
c)
burning wood
d)
riding in a bus
40.
Organisms that need nitrogen to survive
a)
only plants
b)
only animals
c)
only bacteria
d)
all living organisms
41.
Identify the cycle pictured.
a)
The Water cycle
b)
The Carbon cycle
c)
The Nitrogen cycle
d)
The Phosphorus cycle
42.
Identify the cycle pictured.
a)
The Water cycle
b)
The Carbon cycle
c)
The Nitrogen cycle
d)
The Phosphorus cycle
43.

How nitrogen is "fixed" into useable form for plants

a)

only through action of bacteria

b)

only through lightning

c)

through action of bacteria & lightning

d)

through photosynthesis

44.

What part of the carbon cycle is represented by A?

a)

photosynthesis

b)

decomposition

c)

combustion

d)

cellular respiration

45.
Why do living things need nitrogen?
a)
To get energy
b)
To make amino acids
c)
To make proteins
d)
To make proteins AND amino acids
46.
Where is carbon stored in the environment?
a)
Fossil fuels
b)
Wood of trees
c)
Calcium carbonate (shells and bones)
d)
All of the above
47.
What can excess amounts of nitrogen cause in ecosystems? 
a)
Disrupts the equilibrium of ecosystem, causing number of species to decline
b)
Leads to improvement of an ecosystem due to healthy plant growth
c)
Leads to high oxygen content in aquatic ecosystems
d)
Increases the speed of decomposition of plants and animals 
48.
Nitrogen-rich fertilizers and manure can cause water pollution.
a)
True
b)
False
49.
Photosynthesis
a)
absorbs CO2
b)
releases CO2
50.
Respiration
a)
absorbs CO2
b)
releases CO2
51.
TRUE or FALSE?
All of the carbon in existence is continually recycled in the carbon cycle.
a)
True
b)
False
52.
If the plant population decreased, the amount of carbon would _________.
a)
Stay the same
b)
Increase
c)
Decrease
53.

Why do organisms need carbon?

a)

to make biomolecules such as carbohydrates and proteins

b)

because it is the basis of all living compounds

c)

so they can burn energy

d)

to give them shape and structure

54.

What is the Greenhouse Affect?

a)

As carbon dioxide concentrations increase, temperatures increase

b)

Condition that is caused by carbon dioxide, methane, and water vapor trapping heat in the Earth's atmosphere

c)

causes sea levels to rise because it adds water to the ocean.

d)

The cooling of Earth due to air pollution.

55.

Which of the following events would be MOST likely to add Greenhouse Gases to the atmosphere?

a)

Hurricane

b)

Tsunami

c)

Forest Fire

d)

Ecological Succession

56.

Why is Carbon Dioxide considered to be a Greenhouse Gas?

a)

It is a combination of natural and human forces

b)

It has a biogeochemical cycle

c)

It is a type of weather that occurs during a particular season

d)

It absorbs and reradiates infrared radiation to warm the Earth

57.
Increasing quantities of CO2 (Carbon Dioxide) in the atmosphere will cause air temperatures to be _____. 
a)
warmer
b)
cooler
58.
Climate change causes extreme weather conditions such as:
a)
Flooding
b)
Heat Waves
c)
Hurricanes
d)
All of the above
59.
Which human activity contributes the MOST carbon dioxide to the atmosphere?
a)
Fishing
b)
Breathing
c)
Burning Fossil Fuels
d)
Farming
60.

Possible human solutions for limiting global warming and climate change are...

a)

being more energy-efficient

b)

using renewable sources of energy

c)

removing carbon from fossil fuel emissions

d)

all of the above

61.

Melting land ice...

a)

causes sea levels to rise because it adds water to the ocean.

b)

does not cause sea levels to rise because the water fills the space left by the melted sea ice.

62.

Floating sea ice melts...

a)

and causes sea levels to rise because it adds water to the ocean.

b)

but does not cause sea levels to rise because the ice displaces the same amount of ocean water as the melted ice would displace.

63.
Which of the following is the best conclusion that can be made from this graph?
a)
atmospheric carbon dioxide levels have been decreasing since 1960
b)
Hawaii has a lot of carbon dioxide
c)
humans have been working hard to decrease carbon dioxide levels
d)
atmospheric carbon dioxide levels have increased steadily since 1960
64.
Which is a natural source of greenhouse gases?
a)
aerosols
b)
deforestation
c)
volcanic eruptions
d)
burning fossil fuels
65.
Everyone has a carbon footprint.
a)
true 
b)
false
66.

Which statement about the albedo of ocean water and sea ice in the summer is correct?

a)

The low albedo of ocean water means the heated water will sink and form ocean currents.

b)

The albedo of sea ice is lower than the albedo of ocean water, leading to the melting of sea ice.

c)

Sea ice absorbs less radiation, making it warmer than ocean water.

d)

Ocean water absorbs more radiation and is warmer than sea ice.

67.
Why does cutting down trees increase global warming?
a)
trees soak up carbon dioxide
b)
trees provide shade which counteracts global warming
c)
trees absorbs the sun's energy without radiating back into the atmosphere
d)
trees drain greenhouse gases like methane from soil
68.

Which of the following have been linked to climate change? Pick only those that apply.

a)

droughts

b)

flooding

c)

melting of polar ice caps

d)

ocean acidification

e)

all of the above

69.

Which is a primary energy source used by power plants to generate electricity?

a)

coal

b)

wood

c)

petroleum/gasoline

d)

batteries

e)

natural gas

70.

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products according to the Law of Conservation of Mass?

a)

the product is doubled

b)

the product is half the mass of the reactants

c)

the mass is the same

d)

the mass changes depending on the reaction

71.
A + B → AB : is the general form for which reaction type?
a)
Double Replacement
b)
Synthesis
c)
Combustion
d)
Decomposition
72.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
73.
Identify the type of reaction:  
Ca + O --> CaO
a)
Decomposition
b)
Synthesis
c)
Double Replacement
d)
Combustion
74.

Identify this type of reaction,

Br2 + 2KI --> I2 + 2KBr

a)

Synthesis

b)

Single Replacement

c)

Double Replacement

d)

Decomposition

75.
Which reaction type is the following: AgF + CaCl2 --> AgCl + CaF2
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Double Replacement
76.
Which reaction type is the following:  Na + CaF2 --> Ca + NaF
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Double Replacement
77.
Which of the following is the general formula for a decomposition reaction?
a)
A + B  → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
78.
Which reaction type is the following:  Fe + O2 --> Fe2O3
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Double Replacement
79.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
80.
Balance this equation:
 __Li + __Cl2 -> __LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li +  Cl2 -> 2LiCl
81.
Balance this equation...
HgO --> 2Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
82.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
83.
What is the Law of Conservation of Mass?
a)
It states that no matter can be created or destroyed.
b)
It states that no energy can be created or destroyed.
c)
It states that matter can be created or destroyed.
d)
It states that no sound can be created or destroyed.
84.
Which chemical reaction breaks down into 2 substances?
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
85.
When balancing equations a ____ can be placed or changed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
86.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
87.
What coefficient goes in the missing blanks?  There is only one answer.
SnO2 + __ H2 → Sn + __ H2O
a)
5
b)
1
c)
3
d)
2
88.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
89.
Fill in the missing coefficient to balance the equation:                   Mg  +  ___ HCl  →   MgCl2  +   H2
a)
1
b)
2
c)
3
d)
4
90.

Which problem is balanced?

a)

PbO2 + 2H2 --> PbH + O2

b)

SO2 + H20 --> H2SO4

c)

2Na + 2H2O --> 2NaOH + H2

91.
If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the
a)
theoretical yield
b)
mole ratio
c)
actual yield
d)
percentage yield
92.
What is the measured amount of a product obtained from a chemical reaction?
a)
mole ratio
b)
theoretical yield
c)
percentage yield
d)
actual yield
93.
Mole ratios are obtained from the
a)
balanced chemical equation
b)
periodic table
c)
molar mass
94.
What is the mole ratio of H2O to H3PO4 in the following chemical equation?   P4O10 + 6 H2O --> 4 H3PO4 
a)
6:4
b)
4:6
c)
1:3
d)
3:1
95.
When does a chemical reaction stop?
a)
When the lab is finished
b)
When the excess reactant is used up
c)
When the limiting reactant is used up
d)
Chemical reactions never stop
96.

How many grams are in 7.8 moles of NaCl?

a)

476 grams

b)

460 grams

c)

452 grams

d)

462 grams

97.
Balance the following reaction :
 
CaC₂(s)   +   H₂O(l)   -->   C₂H₂(g)   +   Ca(OH)₂(aq)
a)
1,2,2,2
b)
1,2,1,1
c)
2,1,1,1
d)
2,1,2,1
98.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
99.
9. Complete the equation for the percent yield of a chemical reaction:
Percent yield=(________)÷(________)×100%
a)
actual yield; theoretical yield
b)
theoretical yield; actual yield
100.
11.
LiOH + KCl → LiCl + KOH 

b)  I actually produced 6 grams of lithium chloride and I began this reaction with 20 grams of lithium hydroxide. What is my percent yield?
a)
16.9%
b)
5.91%
c)
1.88%
d)
12.3%
101.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
102.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
103.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
104.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

105.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
106.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
107.

In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?

a)

Mg and O

b)

Mg and MgO

c)

MgO

d)

O and MgO

108.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

109.

Balance this equation:

HgO ---> 2Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

110.

Balanced this equation:

Sb2S3 + O2 ---> Sb + SO2

a)

It is balanced.

b)

Sb2S3 + O2 ---> 2Sb + SO2

c)

Sb2S3 + 3O2 ---> 2Sb + 3SO2

d)

3Sb2S3 + 3O2 ---> 2Sb + SO2

111.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

112.

Balance the following equation:

___ Mg+ ___ O2→___ MgO

a)

1, 1, 3

b)

2, 1, 2

c)

1, 2, 1

d)

2, 2, 2

113.

Balance the following equation:

___ SeCl6+ ___ O2→___ SeO2+____Cl2

a)

1, 1, 1, 3

b)

2, 1, 2, 1

c)

1, 2, 1, 2

d)

2, 2, 2, 4

114.
What are the larger numbers that you CAN CHANGE in a chemical equation? 
a)
Coefficient 
b)
Products
c)
Reactants
d)
Subscripts
115.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
116.

What is the atomic mass of Phosphorus (P)?

a)

15

b)

30.974

c)

32.06

d)

28.085

117.

What is the atomic mass of Potassium (K)?

a)

39.098

b)

19

c)

20

d)

40.078

118.

What is the atomic mass of Cobalt (Co)?

a)

57.933

b)

63.546

c)

58.933

d)

51.996

119.

What is the atomic mass of Bromine (Br)?

a)

78.971

b)

30.974

c)

79.904

d)

35.53

120.

How many atoms of Iron (Fe) are in Fe2S3?

a)

1

b)

2

c)

3

d)

0

121.

How many atoms of Hydrogen (H) are in Na(OH)?

a)

1

b)

2

c)

3

d)

0

122.

How many atoms of Oxygen (O) are in Mg(OH)2?

a)

0

b)

1

c)

2

d)

3

123.

How many atoms of Oxygen (O) are in Cu(NO3)3?

a)

3

b)

6

c)

9

d)

12

124.

Calculate the molar mass of CO2

a)

44.009 g/mol

b)

28.01 g/mol

c)

31.998 g/mol

d)

40.098 g/mol

125.

Calculate the molar mass of Al2S3

a)

160.324 g/mol

b)

59.042 g/mol

c)

150.158 g/mol

d)

60.098 g/mol

126.

Calculate the molar mass of MgSO4

a)

112.093 g/mol

b)

120.366 g/mol

c)

120.998 g/mol

d)

235.093 g/mol

127.

Calculate the molar mass of K3PO4

a)

212.27 g/mol

b)

404.656 g/mol

c)

324.01 g/mol

d)

235.093 g/mol

128.

What is the only bird that can swim but cannot fly?

a)

Duck

b)

Goose

c)

Penguin

d)

Flamingo

129.

What is the atomic number of Cl

a)

35.5

b)

17

c)

6

d)

Cl

130.

What is the atomic MASS of Potassium (K)

a)

31.9

b)

19

c)

84

d)

209

131.

Pb is the chemical symbol for what element?

a)

Platinum

b)

Phosphorus

c)

Lead

d)

Bronze

132.

The molar mass of a single element is equal to its...

a)

Atomic mass

b)

Atomic number

c)

Oxidation number

d)

Valence electrons

133.
What is the molar mass of CO2?
a)
12
b)
16
c)
32
d)
44
134.

How many particles are in a mole?

a)

602

b)

602 million

c)

602 moles

d)

6.022 x 1023

135.
Molar mass is in units of ________.
a)
grams
b)
grams/mole
c)
mole
d)
moles/gram
136.
What is the molar mass of AuCl3?
a)
96 g
b)
130 g
c)
232.5 g
d)
303.3 g
137.

What is the definition for Avogadro's number?

a)

number of grams per one mole of a substance

b)

whole number ratio that is a multiple of a chemical formula

c)

simplest, whole number ratio of a chemical formula

d)

6.02 x 1023 particles per one mole of a substance

138.
How many moles are present in 32.3 grams of carbon dioxide (CO2)?
a)
44.01 moles
b)
1421.52 moles
c)
32.3 moles
d)
0.73 moles
139.

Which is the equation to calculate number of moles?

a)

Add all the atomic masses of each element

b)

Mass X Molar Mass

c)

Molar Mass / Mass

d)

Mass / Molar Mass

140.

How do I calculate the molar mass of a compound?

a)

It is always 6.02 x 1023

b)

Find the atomic mass of every element in total and add them together

c)

It is always 1

d)

Number of moles x mass

141.

What element has an atomic mass of 1.01?

a)

Hydrogen

b)

Helium

c)

Carbon

d)

Gold

142.

What element has an atomic number of 28?

a)

Calcium

b)

Uranium

c)

Argon

d)

Nickel

143.

Find the mass of 1 mole of Ni

a)

558.6 g/mol

b)

58.69 g

c)

37.02 g/mol

d)

37.02 g

144.

What is the mass of 2 Moles of H2O?

a)

18g

b)

.018 g

c)

1.8 g

d)

16 g

145.

What is Avogadro's number?

a)

6.02 x 1023

b)

1 mole

c)

600 million

d)

6.02

146.

How many moles are in 6.02 x 1023 molecules of H2O?

a)

1 mole

b)

2 moles

c)

6.02 moles

d)

602000000000000000000000 moles

147.

A mole is:

a)

The SI unit for mass

b)

The SI unit for the amount of a substance

c)

The SI unit for volume

d)

The SI unit for area

148.

What converting from moles to the number of particles, moles is multiplied by:

a)

an equivalent value

b)

a conversion factor

c)

the number of atoms in the formula

d)

the mass of the substance

149.

Which has the most particles?

a)

1 mole H2

b)

1 mole Na1+

c)

1 mole Al(OH)3

d)

These are all the same

150.

Why is the mole used in chemistry?

a)

The mass of atoms is in AMUs which is too hard to convert to grams.

b)

A dozen is not a scientific amount.

c)

Chemists needed to make chemistry easier to understand.

d)

It makes counting large numbers of small particles easier.

151.

How is moles abbreviated?

a)

M

b)

m

c)

mol

d)

ml

152.
What is the mole used for? 
a)
To measure the amount of grams in a substance
b)
To measure the amount of atoms or molecules in a substance
c)
To measure the amount of energy in a substance
d)
To measure the amount of bonding in a substance 
153.
How many atoms are in 1 mole of NaCl? 
a)
6.02 x 1023
b)
58 
c)
11
d)
17
154.

How many atoms are in 1 mole of Iodine (I)?

a)

6.022 x 1023

b)

4.022 x 1023

c)

6.022 x 1025

d)

4.022 x 1025

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