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Chemistry review

Total questions: 111

Worksheet time: 1hrs 4mins

Name
Class
Date
1.
In an exothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released
2.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
3.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
4.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
5.
After you mix two substances together, a new substance forms.  This is an example of:
 
a)
 Physical Change
b)
 Chemical Change
6.

What term is given to a reaction which transfers heat energy to the surroundings?

a)

Endothermic

b)

Reversible

c)

Exothermic

d)

Exotermic

7.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
8.
In an endothermic reaction the system is releasing energy.
a)
True
b)
False
9.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
10.

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

a)

It is an exothermic reaction

b)

It is an endothermic reaction

11.

Temperature is...

a)

A measure of average kinetic energy in a substance

b)

The same as heat

c)

A measure of the movement of the atoms in a substance

d)

A measure of the average potential energy in a substance

12.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Kinetic

d)

Potential

13.

What type of change can be easily reversed?

a)

chemical change

b)

physical change

c)

both chemical and physical changes

d)

neither physical or chemical changes

14.

Which of the following is an example of a physical change?

a)

a bike rusting

b)

toast burning

c)

butter melting

d)

food spoiling

15.

Which of the following examples is a physical change but NOT a change of state of matter?

a)

logs burning

b)

water freezing into ice cubes

c)

candle wax melting

d)

paper being cut

16.

Which of the following is an example of a chemical change?

a)

a penny tarnishing

b)

a mirror being scratched

c)

hair being cut

d)

water being boiled

17.

What is the best way to separate a mixture of sugar, sand, and water?

a)

Freeze the mixture, causing the water to be destroyed, then sift the sugar from the sand.

b)

Filter the sand from the sugar and water, then heat the mixture, causing the water to evaporate.

c)

Filter the mixture, causing the sugar and sand to get caught but not the water.

d)

Stir the mixture, causing the water to move above the sugar and sand.

18.

A student is investigating changes with common classroom materials. Which of the following BEST describes the conclusion the student can make about the investigations?

a)

The paperclip shows evidence of a physical change by changing the shape of the object, whereas the pencil eraser and hole puncher show evidence of a physical change by changing the size of the object.

b)

All three investigations show evidence of a physical change due to a change in the color of the original substance.

c)

The paperclip and hole puncher shows evidence of a physical change by changing the chemical properties of the original object, whereas the pencil eraser shows evidence of a physical change by changing the size of the object.

d)

All three investigations show evidence of a physical change due to a change in state of matter.

19.

A 5th grade student places baking soda in a cup. The student then adds vinegar to the cup. The student collects the data below from the experiment. Based upon the results of the experiment, which statement BEST describes whether the change is a physical or chemical change.

a)

The data concludes that a physical change has occurred because it had an increased change in temperature, which resulted in the liquid to start bubbling.

b)

The data concludes that a physical change has occurred because the color of the liquid changed when you mixed two materials.

c)

The data concludes that a chemical change has occurred because there was formation of bubbles when the materials reacted to each other.

d)

The data concludes that a chemical change has occurred because mixing two substances together will always result in a reaction.

20.

Which of the following is a correct statement about the investigations?

a)

All of the situations are examples of physical changes because all of the investigations exhibit changes to the physical properties.

b)

None of the situations are examples of physical changes because they all involve a color change.

c)

Situation 2 is a physical change because rust forming is a natural process.

d)

Situations 1 and 3 are physical changes because no new substances are formed.

21.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
22.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
23.
Is a a rusting bicycle a chemical or physical change?
a)
chemcial
b)
physical
24.
Is melting ice a chemical or physical change?
a)
chemical
b)
physical
25.
Is spoiling food a physical or chemical change?
a)
phyiscal
b)
chemical
26.
Is frying an egg a physical or chemical change?
a)
chemical
b)
physical
27.
Salt dissolves in water
a)
physical Change
b)
chemical change
28.
Which is a chemical change?
a)
freezing fruit juice
b)
slicing a potato
c)
boiling water
d)
copper metal turning green
29.
what is the definition of physical change?
a)
any change that results in the formation of new chemical substances. 
b)
rusting
c)
changes affecting the form of a chemical substance, but not its chemical composition.
d)
any property that is measurable, whose value describes a state of a physical system
30.

What is physical change?

a)

How two chemicals react with one another when combined

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

31.

What is chemical change?

a)

How two chemicals react with one another when combined

b)

A property that we can measure or observe with our 5 senses or other tools

c)

When two chemicals react with one another to form a new substance

d)

When a change occurs but it does not result in the formation of a new substance

32.

When you increase the energy by heating a liquid what happens to the motion of the molecules

a)

They slow down

b)

They speed up

c)

Heat doesnt change the motion of the molecules

33.

Which of the following is an indication of chemical change

a)

Melting

b)

Freezing

c)

Burning

d)

Evaporating

34.

What do we call the molecules that are present at the end of a chemical reaction?

a)

Reactants

b)

Products

c)

Ingredients

d)

Atoms

35.

What does the number 3 represent in 4NH3?

a)

Subscript

b)

Superscript

c)

Coefficient

36.

What does the number 4 represent in 4NH3?

a)

Subscript

b)

Superscript

c)

Coefficient

37.

How many Nitrogen (N) atoms are in 4NH3?

a)

4

b)

1

c)

3

d)

12

38.

How many Hydrogen (H) atoms are in 4NH3?

a)

4

b)

1

c)

3

d)

12

39.

How many total molecules is 4NH3?

a)

4

b)

1

c)

3

d)

12

40.

How many total atoms make up 4NH3?

a)

4

b)

16

c)

3

d)

12

41.

In the equation shown, what are the reactant(s)?

a)

N2 + H2

b)

NH3

42.

In the equation shown, what are the product(s)?

a)

N2 + H2

b)

NH3

43.

Is this equation balanced?

a)

Yes

b)

No

44.

Is this equation balanced?

a)

Yes

b)

No

45.

Is this equation balanced?

a)

Yes

b)

No

46.

To balance an equation you should:

a)

ONLY change subscripts.

b)

ONLY change coefficients.

c)

Change BOTH subscripts and coefficients.

47.

Which reactant is missing from the equation shown?

(What should go in the place of the "X"?)

a)

One hydrogen atom.

b)

Three hydrogen atoms.

c)

Four oxygen atoms.

48.

Which of the following is a chemical reaction?

a)

Sodium and chlorine atoms bond to form salt molecules.

b)

Ice melts to form water.

c)

Carbon dioxide freezes to form dry ice.

d)

Salt and water mix to form salt water.

49.

In a chemical equation...

a)

a new substance is formed

b)

new atoms are formed

c)

old atoms disappear

d)

a equal sign is always used

50.

Reactants are

a)

new substances

b)

old substances

c)

likely to disappear

d)

likely to appear

51.

Products are

a)

old substances

b)

new substances

c)

atoms that disappear

d)

atoms that do not exist

52.

When writing a chemical equation, reactants are on the _____________ while products are on the _________________.

a)

top, bottom

b)

right, left

c)

left, right

d)

bottom, top

53.

The law of conservation of mass states

a)

chemical reactions create new atoms

b)

atoms cannot be created or destroyed

c)

reactants vanish once a reaction takes place

d)

products appear when a reaction takes place

54.

The amount of atoms on each side of a chemical equation are

a)

different

b)

the same

55.

Is the following equation balanced?

a)

True

b)

False

56.

How many Potassium (K) atom are there?

a)

1

b)

2

c)

3

d)

4

57.

How many Iron (Fe) and Oxygen (O) are there?

a)

Fe = 1, O = 2

b)

Fe = 2, O = 3

c)

Fe = 2, O = 1

d)

Fe = 1, O = 3

58.

How many Hydrogen (H) and how many Chlorine (Cl) are there?

a)

H = 4, Cl = 1

b)

H = 4, Cl = 0

c)

H = 4, Cl = 3

d)

H = 4, Cl = 4

59.

How many molecules are there?

a)

3

b)

6

c)

12

d)

18

60.

Which of the following is true?

a)

H = 6, So = 4

b)

H = 3, So = 4

c)

H = 6, So = 12

d)

H = 6, So = 2

61.
Matter can not be created nor destroyed: it can only be
a)
Destroyed a little bit
b)
Invisible
c)
Transformed, changed
d)
None of the above
62.
The number to the lower side of an element is a 
a)
Subscript
b)
Superscript
c)
Coefficient
d)
Charge
63.
The number in front of a compound or element is a 
a)
Subscript
b)
Coefficient
c)
Superscript
d)
Charge
64.
A chemical reaction is balanced when
a)
both sides have the same elements
b)
Both sides have the same  number of atoms
c)
Same subscripts
d)
Same coefficients
65.
Which of these is not a chemical reaction?
a)
Burning of wood
b)
Milk going bad
c)
Mixing vinegar and baking soda
d)
Melting of ice
66.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
67.
What is the Law of Conservation of mass?
a)
Mass is created in a chemical reaction
b)
Mass is created in a physical change
c)
New chemicals formed from a chemical reaction have a larger overall mass than the original reactants
d)
Mass is never created or destroyed
68.

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

a)

Originator

b)

Reactant

c)

Product

d)

Produce

69.

How many atoms do you have in the compound 2MgCl2?

a)

2 atoms

b)

4 atoms

c)

6 atoms

d)

8 atoms

70.

How many Ca (Calcium) atoms are found in Ca(OH)2?

a)

5 atoms

b)

3 atoms

c)

2 atoms

d)

1 atom

71.

How many atoms do you have in the chemical formula 2Mg(ClO3)2?

a)

2 atoms

b)

7 atoms

c)

9 atoms

d)

18 atoms

72.

Law of conservation of mass states the amounts of atoms in the reactants and the products...

a)

Increase

b)

Decrease

c)

Stay the same

d)

No correct answer

73.

Does the equation H2+O2 →H2O follow the Law of Conservation of Mass?

a)

Yes, because the atoms are equal.

b)

No, because more info is needed.

c)

No, because there are more atoms in the product.

d)

No, because there are more atoms in the reactant.

74.
At higher temperatures
a)
particles in an object have less energy
b)
particles in an object move faster
c)
a gas contracts
75.
A gas
a)
has a definite shape but no definite volume
b)
has a definite volume but no definite shape
c)
has fast-moving particles
76.

Freezing

a)

Solid to gas

b)

Liquid to solid

c)

Gas to solid

77.

Boiling

a)

liquid to gas

b)

gas to solid

c)

gas to liquid

78.
Which state of matter has a definite shape?
a)
solid
b)
liquid
c)
gas
79.

What is happening when my ice cream changes from a solid to a liquid?

a)

freezing

b)

melting

c)

burning

80.

The state of matter that has no definite size or shape is

a)

Solid

b)

Liquid

c)

Gas

81.

Particles of a liquid

a)

are tightly packed together and stay in a fixed position.

b)

are free to move around one another but still touch.

82.

Solid to Gas

a)

Deposition

b)

Sublimation

c)

Evaporation

83.

What is condensation?

a)

gas to solid

b)

gas to liquid

c)

liquid to solid

84.

The slower the particles in a substance move,

a)

the colder it is.

b)

the warmer it is.

c)

the more energy it has.

85.
The temperature of a substance increases as___.
a)
the substance expands
b)
the average kinetic energy of its particles increases
c)
the substance's volume increases
d)
the substance's mass increases
86.

Definite shape and definite volume

a)

Solid

b)

Liquid

c)

Gas

87.

Has a definite volume but not a definite shape

a)

Solid

b)

Liquid

c)

Gas

88.

Liquid to Gas

a)

Condensation

b)

Evaporation

c)

Sublimation

89.

Phase change going from Liquid to Solid...

a)

Melting

b)

Freezing

c)

Condensation

d)

Sublimation

90.

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

a)

Sublimation

b)

Deposition

c)

Ionization

d)

Condensation

91.

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

a)

Vaporization

b)

Deposition

c)

Condensation

d)

Melting

92.

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

a)

Melting

b)

Vaporization

c)

Ionization

d)

Freezing

93.

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

a)

Deposition

b)

Sublimation

c)

Condensation

d)

Recombination

94.

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

a)

Freezing

b)

Condensation

c)

Melting

d)

Sublimation

95.

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

a)

Ionization

b)

Recombination

c)

Condensation

d)

Sublimation

96.

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

a)

Deposition

b)

Sublimation

c)

Condensation

d)

Vaporization

97.

Is the substance gaining or losing energy?

a)

Gaining

b)

Losing

98.

Are the particles moving faster or slower as time goes on?

a)

Faster

b)

Slower

99.

What state/phase is the object likely from points A to B?

a)

Solid

b)

Liquid

c)

Gas

d)

Plasma

100.

What is happening to the particles in the substance between points A and B?

a)

Melting

b)

Freezing

c)

Speeding Up

d)

Slowing Down

101.

What is happening to the particles in the substance between points D and E?

a)

Melting

b)

Freezing

c)

Vaporizing

d)

Sublimating

102.

Is the substance gaining or losing energy?

a)

Gaining

b)

Losing

103.

Kaitlyn is doing an experiment where she wants to learn if using different amounts of fertilizer has an effect on the mass of each apple produced on apple trees at the orchard. What base unit would she use to collect her data?

a)

liters

b)

grams

c)

meters

d)

hectograms

104.

The amount of space (volume) a liquid takes up would be measured in what base unit?

a)

liter

b)

meter

c)

gallon

d)

gram

105.

The Metric System is based on this number.

a)

100

b)

1/10

c)

1/100

d)

10

106.

How is density measured?

a)

With a densometer

b)

By measuring the length, width, and height and calculating using l x w x h

c)

By measuring mass and volume and then calculating using D=m/v

d)

Using a graduated cylinder and water

107.

What is the base metric unit for mass?

a)

meters

b)

liters

c)

grams

d)

g/mL

108.

What is the base metric unit for volume?

a)

meters

b)

liters

c)

grams

d)

g/mL

109.

3,000 cm = _____ dekameters

a)

3

b)

30

c)

0.03

d)

0.003

110.

7.4 L = _____ cL

a)

74 cL

b)

7400 cL

c)

740 cL

d)

0.074 cL

111.

78 dm = _____ m

a)

780 m

b)

0.78 m

c)

7800 m

d)

7.8 m

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