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Chemical Reaction Unit Review

Total questions: 100

Worksheet time: 3hrs 20mins

Name
Class
Date
1.

A substance that results from a chemical change

a)

Product

b)

Reactant

c)

Law of Conservation of Mass

d)

Chemical reaction

2.

Sodium and chlorine react to form sodium chloride. Sodium and chlorine are examples of

a)

Reactants

b)

Products

c)

Exothermic reactions

d)

Precipitates

3.

A __________ involves a change in state, like melting, freezing, or boiling.

a)

Chemical reaction

b)

Physical change

c)

Exothermic reaction

d)

Endothermic reaction

4.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
5.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
6.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
7.
A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?
a)
cutting a piece of paper
b)
folding a piece of paper
c)
tearing a piece of paper
d)
burning a piece of paper
8.
Digesting your food is an example of 
a)
chemical change
b)
physical change
9.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
10.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
11.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
12.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
13.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
14.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
15.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
16.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
17.

Is ice melting a physical or chemical change?

a)
Physical
b)
Chemical
18.
Is a burning candle a physical or chemical change?
a)
Physical
b)
Chemical
19.
Is sour milk a physical or chemical change?
a)
Physical
b)
Chemical
20.
Is melting butter a physical or chemical change?
a)
Physical
b)
Chemical
21.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
22.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
23.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
24.
A molecule is smaller than an atom.
a)
True
b)
False
25.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
26.
How many Hydrogen (H) atoms are in NH3O5
a)
3
b)
4
c)
5
d)
1
27.
A molecule is________
a)
a glob of gelatinous goo
b)
smaller than an atom
c)
filled with raisons
d)
more than one atom bonded together
28.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
29.
What is the chemical symbol for the element hydrogen
a)
H
b)
He
c)
h
d)
he
30.
What is the chemical symbol for the element Silicon
a)
S
b)
Si
c)
si
d)
Sl
31.
What is the chemical symbol for the element copper?
a)
co
b)
c
c)
Cu
d)
cu
32.
What is the chemical symbol for the element Aluminum
a)
A
b)
AL
c)
Al
d)
al
33.

the basic structural unit of matter

a)

atom

b)

matter

c)

element

d)

nucleus

34.

the positively charged subatomic particle contained in the nucleus of an atom

a)

proton

b)

neutron

c)

electron

d)

matter

35.

one or two letters that represent the name of an element

a)

element name

b)

element symbol

c)

atomic number

d)

atomic mass

36.
What does the 6 represent?
a)
atomic mass
b)
atomic number
c)
element name
d)

element symbol 

37.
What does the C represent?
a)
atomic mass
b)
atomic number
c)
element name
d)

element symbol 

38.
These are found on the Periodic Table.
a)
Compounds
b)
Elements
c)
Mixtures
39.
What is the name of this element?
a)
Helium
b)
Rubidium
c)
Hydrogen
d)
Mercury
40.
What element is this?
a)
Silver
b)
Silicon
c)
Sulfur
d)
Selenium
41.
All matter is made of .....
a)
energy 
b)
atoms 
c)
air
d)
chemistry
42.
An element is made up of only one kind of _____.
a)
isotope
b)
plastic
c)
atom
d)
metal
43.
Which is an electron?
a)
A
b)
B
c)
C
44.
Which is a proton?
a)
A
b)
B
c)
C
45.
Which is a neutron?
a)
A
b)
B
c)
C
46.

Which of the following is not a compound?

a)

HCl

b)

Cl

c)

NaCl

d)

CO2

47.
Is water an element or a compound?
a)
Element
b)
Compound
48.

A compound consists of two or more different elements bound together.

a)
True
b)
False
49.
Is Iron (Fe) an element or a compound?
a)
Element
b)
Compound
50.
Which of the following organelles is responsible for photosynthesis?
a)
Mitochondria
b)
Chloroplast
c)
Nucleus
d)
Vacuole
51.
What molecule does photosynthesis create?
a)
CO2
b)
Chloroplast
c)
Glucose
d)
Energy
52.
Which of the chemical equations below best matches the model being displayed in the graphic above?
a)
C6H12O6   +   6O2 -->  6CO2  + 6H2O + Light Energy
b)
6CO2  +  6H2O + Light Energy  --> C6H12O6   +   6O2
c)
6CO2  +  C6H12O6  --> 6O2   +  6H2O + Light Energy
d)
C6H12O6   +   O2 -->  C6H12O6   +   O2
53.
The main source of energy for all life comes from ____.
a)
the Earth
b)
the moon
c)
the sun
d)
the food we eat/make
54.
The reactants of photosynthesis are
a)
sugar and water.
b)
sugar and oxygen.
c)
carbon dioxide and water.
d)
carbon dioxide and oxygen.
55.
What are the products of photosynthesis?
a)
Carbon dioxide and water
b)
Carbon dioxide and oxygen
c)
Glucose and oxygen
d)
Glucose and water
56.
What pigment absorbs sunlight for photosynthesis?
a)
chloroplast
b)
thylakoid
c)
grana
d)
chlorophyll
57.
What is the purpose of photosynthesis?
a)
make glucose
b)
make ATP
c)
make light
d)
release carbon dioxide
58.
What is the gas we breathe out that plants use for photosynthesis?
a)
sulfur
b)
carbon dioxide
c)
oxygen
d)
hydrogen
59.
What are the reactants in the equation for cellular respiration?
a)
oxygen and lactic acid
b)
carbon dioxide and water
c)
glucose and oxygen
d)
water and glucose
60.
What is the correct equation for cellular respiration?
a)
6O2 + C6H12O6 -> 6CO2 + 6H2O + Energy
b)
6O2 + C6H12O6 + Energy -> 6CO2 + 6H2O
c)
6CO2 + 6H2O -> 6O2 + C6H12O6 + Energy
d)
6CO2 + 6H2O + Energy -> 6O2 + C6H12O6
61.
Where does cellular respiration occur?
a)
Mitochondria
b)
Chloroplast
c)
Nucleus
d)
Vacuole
62.
What does the chemical formula C6H12O6 represent?
a)
Oxygen
b)
Carbon dioxide
c)
Hydroxide
d)
Glucose
63.

In Cellular Respiration, cells use energy available in food to create what energy-rich compound?

a)

ATP

b)

ADP

c)

glucose

d)

water

64.

The process that releases energy from food in the presence of oxygen is:

a)

fermentation

b)

photosynthesis

c)

cellular respiration

d)

synthesis

65.
Which statement about photosynthesis is correct?
a)
Plants get the energy they need for photosynthesis from water.
b)
Plants get the energy they need for photosynthesis from soil.
c)
Plants get the energy they need for photosynthesis from sunlight.
d)
Plants do not require energy to perform photosynthesis.
66.
Cellular Respiration's goal is to
a)
make water
b)
make ATP
c)
make glucose
d)
make  oxygen
67.

Phase change going from Liquid to Solid...

a)

Melting

b)

Freezing

c)

Condensation

d)

Sublimation

68.

Phase change going from a Gas to a Liquid...

a)

Sublimation

b)

Deposition

c)

Ionization

d)

Condensation

69.

Phase change going from a Solid to a Liquid...

a)

Freezing

b)

Condensation

c)

Melting

d)

Sublimation

70.
What takes place when a liquid changes to a gas?
a)
condensation
b)
melting
c)
evaporation
d)
freezing
71.

All phase changes (changing states) requires energy to be added or taken away.

a)
True
b)
False
72.

What is A represent?

a)

Solid

b)

Liquid

c)

Gas

d)

Evaporation

73.

What is B represent?

a)

Freezing

b)

Melting

c)

Condensation

d)

Evaporation

74.

What is C represent?

a)

Freezing

b)

Melting

c)

Condensation

d)

Evaporation

75.

What is E represent?

a)

Freezing

b)

Melting

c)

Condensation

d)

Evaporation

76.

What is F represent?

a)

Freezing

b)

Melting

c)

Condensation

d)

Evaporation

77.

What is D represent?

a)

Liquid

b)

Solid

c)

Gas

78.

What is G represent?

a)

Liquid

b)

Solid

c)

Gas

79.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
80.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
81.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
82.

Which of the following process is exothermic?

a)

Candle was melting

b)

A puddle evaporating

c)

Dry ice (solid carbon dioxide) subliming to form gaseous carbon dioxide

d)

Water freezing to form ice

83.

In an endothermic reaction, energy is _________.

a)

absorbed

b)

released

84.
Evaporation is what kind of change?
a)
Endothermic
b)
Exothermic
85.
Which one of the following would you use to separate sand from iron filings?
a)

magnetism

b)

filtration

c)

sorting

d)

evaporation

86.

How to BEST separate pebbles and water?

a)

magnetism

b)

filtration

c)

evaporation

87.

James wants to seperate the salt from the water in his glass of salt water. What seperation method should James use?

a)

Magnets

b)

Evaporation

c)

Filter

d)

Using his hands

88.

What change occurs when cook pancakes for breakfast?

a)

Physical Change

b)

No change

c)

Chemical Change

89.

____________________ is the process of separating a solution by changing the liquid water to water vapor leaving behind the solid.

a)

Solubility

b)

Condensation

c)

Evaporation

d)

Filtration

90.

A bicycle has rusted from staying outside too long. What kind of reaction is this?

a)

Chemical Change

b)

Physical Change

91.

Is this equation balanced?

a)

Yes, everything appears the same amount on each side.

b)

No, there are too many hydrogen on the left side.

c)

No, there are too many oxygen on the left side.

92.

Is this equation balanced?

a)

Yes, everything appears the same amount on each side.

b)

No, there are too many hydrogen on the left side.

c)

No, there are too many oxygen on the left side.

93.

How many Carbon atoms on the Reactant side of the equation?

5C4O8→10C+2C5O20

a)

4

b)

5

c)

10

d)

20

94.

Identify if the following equation is unbalanced or balanced.

4K+P3→3KP+K

a)

Unbalanced

b)

Balanced

95.

Identify if the following equation is unbalanced or balanced.

O3+2C→3OC

a)

Unbalanced

b)

Balanced

96.

This image is an example of...

a)
elements
b)
mixtures
c)
compounds
97.
Classify the picture with the correct label.
a)
Element
b)
Compound
c)

Mixture

d)

Molecule

98.
Classify the picture with the correct label.
a)
Element
b)
Compound
c)

Mixture

99.

What type of substance does the diagram represent?

a)

Element

b)

Mixture

c)

Compound

100.

Which model represents an element?

a)

Model 1

b)

Model 2

c)

Model 3

d)

Model 4

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