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Unit 1 Principles of Chemistry

Total questions: 100

Worksheet time: 2hrs 27mins

Name
Class
Date
1.

A change in the shape of a substance

a)

chemical change

b)

Physical change

c)

Chemical Change

d)

Precipitate

2.

A transformation of one substance into another substance

a)

Chemical change

b)

Physical change

c)

Chemical Reaction

3.

Results in a chemical change and the formation of a new substance

a)

Chemical change

b)

Physical change

c)

Chemical reaction

d)

Precipitate

4.

Evidence of a chemical change

a)

Chemical change

b)

Physical change

c)

Chemical reaction

d)

Precipitate

5.

A physical change is any change in the ______, _______ or _______ of matter of a substance.

a)

size

b)

shape

c)

phase

d)

another

6.

Examples of physical changes (4 choices)

a)

melting

b)

freezing

c)

breaking

d)

condensing

e)

burning

7.

Ten grams of sugar is placed in a beaker with 100ml of water. Initially, the sugar is at the bottom of the beaker however once gradually heated the sugar disappears. Which statement best explains what type of change occurred?

a)

chemical, irreversible change

b)

physical, irreversible change

c)

chemical, reversible change

d)


physical, reversible change

8.

Which of the following observations indicate that a chemical reaction has taken place?  Select TWO correct answers.

a)

liquid water evaporating as a result of thermal energy from the sun

b)


two solutions being mixed together and a solid is formed

c)

condensation on the window of a house on a cold day

d)

a sugar cube dissolving after it has been dropped in a glass of water

e)

gas bubbles forming as a cake is baking in the oven

9.

Ms. Clark heated 5 grams of sugar. The sugar first looked shiny, and then it melted and became dark brown. Finally, all that was left was a black, shiny residue. She then heated 5 grams of sand in the same way. The sand’s appearance did not change.

What explains these results?

a)

Sand is an element, but sugar is a compound.

b)

Heating the sugar caused a chemical change.

c)

Heating the sand caused a chemical change.

d)

Heat only caused physical changes in both the sand and sugar.

10.

Which of the following is a sign that a chemical reaction (or change) has occurred?

a)

change in shape

b)

melting

c)

formation of a gas

d)

dissolving

11.

Is melting butter for popcorn a chemical or physical change?

a)

chemical

b)

physical

12.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
13.
Photosynthesis is an example of a
a)
physical change
b)
chemical change
14.

What does it mean when there is a physical change?

a)

Matter has changed from one substance into another.

b)

Matter has changed on the molecular level.

c)

A new substance has been formed.

d)

Matter has changed size, shape, or form.

15.

When an electric current passes through the wire filament inside a light bulb, the wire filament shines with a bright light and becomes very hot. When the current stos, the wire filament dims and cools. Which of the following is the BEST evidence that these changes are physical properties of the wire filament?

a)

The changes produce light.

b)

The changes are easily reversed.

c)

The changes are produced by electricity.

d)

The changes result in the release of heat.

16.

Which of the following is NOT an example of a physical change?

a)

Melting chocolate

b)

Grinding up chalk into a powder

c)

Soured milk

d)

Ice cream melting

17.

All these are examples of a chemical change EXCEPT....

a)

Rusting metal

b)

Boiling water

c)

Burning paper

d)

Rotting food.

18.

All of these are example of a physical change EXCEPT .....

a)

Melting butter

b)

Flattening a piece of metal

c)

Cutting paper

d)

Tarnishing silver vase

19.

if there is a change in color, production of light, production of heat, production of gas, production of smell or formation of a new substance.

a)

physical change

b)

chemical change

20.
HCN is made of 3 types of atoms
a)
True
b)
False
21.
H2O2← ?
This number tells the number of atoms present.
a)
coefficient
b)
molecule
c)
subscript
d)
atom
22.
→2H2O
This number tells how many molecules are in a chemical equation.
a)
coefficient
b)
subscript
c)
compound
d)
element
23.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
24.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
25.
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
26.
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
27.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
28.
The large number written in front of a chemical formula.  It shows the number of molecules.
a)
Molecule
b)
Compound
c)
Coeffiecient
d)
Subscript
29.
The small number to the right of an elemental symbol  ( H2) is called?
a)
 a subscript 
b)
a coefficient 
c)
a variable 
d)
a divisor 
30.
When a molecule is made up of more than two different elements ( Example CO2)  we call this .......................
a)
a mixture 
b)
atom
c)
a compound 
31.

How many atoms of hydrogen are in a molecule of glucose (C6H12O6)?

a)

12

b)

6

c)

18

d)

4

32.

Which of the following accurately describes the chemical formula of the molecule shown above?

a)

3CH8O

b)

C3H7O

c)

C4H8O2

d)

C3H8O

33.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
34.
How many Elements are in the compound C2H8O ?
a)
2
b)
1
c)
3
d)
0
35.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
36.
How many Chlorine are in MgCl2?
a)
2
b)
1
c)
3
37.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
38.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
39.
How many atoms of Hydrogen are in this compound
a)
1
b)
2
c)
3
d)
4
40.

How many elements are present in this compound? (Careful!)

Mg2As3COHNi2

a)

2

b)

4

c)

6

d)

10

41.

How many atoms of hydrogen are in this compound?

a)

1

b)

2

c)

3

d)

4

42.

How many atoms of Iron are in this compound?

a)

1

b)

2

c)

3

d)

4

43.

Which chemical formula correctly displays 1 atom of nickel and 2 atoms of Fluorine?

a)

niF2

b)

NIF2

c)

Ni1F2

d)

NiF2

44.
The substance being dissolved in a solution.
a)
sands
b)
solute
c)
solvent
d)
alloy
45.
The substance in which a solute is dissolved
a)
sands
b)
solvent
c)
alloy
d)
negative particles
46.
A solution is a ___________mixture.
a)
heterogeneous
b)
homogeneous
c)
concentration
d)
ionic
47.
Solutions are composed of __________ .
a)
salts and solutes
b)
solvents and salts
c)
solutes and alloys
d)
solutes and solvents
48.

A solution that contains all of the solute that it can hold at a given temperature.

a)

unsaturated solution

b)
saturated solution
c)

homogeneous solution

d)
diluted solution
49.
When one of the parts of the solution is water we call it _________. 
a)
water stuff 
b)
water mixture 
c)
aqua-man
d)
aqueous 
50.
If we are making Kool-aid with sugar, Kool-aid powder, and water, which part is the solvent?
a)
water
b)
powder
c)
sugar
d)
powder and sugar
51.

In Michael's science experiment with salt water, NaCl (salt) would be considered the ______.

a)

Solution

b)

Solute

c)

Solvent

d)

Solvation

52.

You can make a solution more concentrated by adding more __________.

a)
solute
b)
solvent
c)
water
d)

solution

53.

Avery is conducting a science experiment. When water is added to a solution it is called a ______________

a)

dilution

b)

concentration

c)

heterogeneous solution

d)

dissociation

54.

Isla is painting her room. Which is an example of a physical property she might consider?

a)

color

b)

flammability

c)

reactivity

d)

toxicity

55.

Aria and Aiden observed a piece of iron change from shiny to rusty. What caused this change?

a)

a chemical reaction

b)

a heat reaction

c)

a cold reaction

d)

a physical reaction

56.
When one of the parts of the solution is water we call it _________. 
a)
water stuff 
b)
water mixture 
c)
aqua-man
d)
aqueous 
57.
If we are making Kool-aid with sugar, Kool-aid powder, and water, which part is the solvent?
a)
water
b)
powder
c)
sugar
d)
powder and sugar
58.

In Michael's science experiment with salt water, NaCl (salt) would be considered the ______.

a)

Solution

b)

Solute

c)

Solvent

d)

Solvation

59.

You can make a solution more concentrated by adding more __________.

a)
solute
b)
solvent
c)
water
d)

solution

60.

Luna and Daniel are conducting an experiment to see how much __________ can dissolve in a solvent to create saturated, unsaturated, and supersaturated solutions.

a)

sugar

b)

liquid

c)

solution

d)

solute

61.

A solution that contains all of the solute that it can hold at a given temperature.

a)

unsaturated solution

b)
saturated solution
c)

homogeneous solution

d)
diluted solution
62.
Solutions are composed of __________ .
a)
salts and solutes
b)
solvents and salts
c)
solutes and alloys
d)
solutes and solvents
63.

In a science experiment, Avery dissolved sugar in water. What is the substance in which the sugar is dissolved?

a)

sands

b)

solvent

c)

alloy

d)

negative particles

64.

Emma is making a sugar solution for her science experiment. What is the substance being dissolved in the solution?

a)

sands

b)

solute

c)

solvent

d)

alloy

65.

Aria is making lemonade. She adds sugar to the water. The sugar is a

a)

solute

b)

solution

c)

science

66.
A solution is a kind of ________. 
a)
mixture 
b)
compound 
c)
element 
d)
stuff 
67.

What is the easy way to remember solvent?

a)

less of it, a solid

b)

the MAIN PART, liquid, usually water

68.

What does soluble mean?

a)

solute and solvent

b)

to break up a solute in a solvent

c)

Able to dissolve in a solvent

69.

What does insoluble mean?

a)

The main part, the liquid, usually water

b)

Unable to dissolve in a solvent

c)

aguas frescas

70.

If I dissolve carbon dioxide in water, what is the solvent?

a)

Carbon Dioxide

b)

There is no solvent

c)

Oxygen

d)

Water

71.

The more solute you use, the more concentrated the solution is

a)
False
b)
Sometimes true
c)
Depends on the temperature
d)
True
72.

Explain how surface area affects the rate of dissolution of a solid solute in an aqueous solution.

a)

Larger surface area decreases the rate of dissolution

b)

Larger surface area increases the rate of dissolution

c)

Surface area has no effect on the rate of dissolution

d)

Smaller surface area increases the rate of dissolution

73.

Which of the following is an example of a solute in an aqueous solution?

a)

Water

b)

Salt

c)

Air

d)

Oil

74.

How does agitation (stirring) affect the rate of dissolution of a solid solute in water?

a)

It decreases the rate of dissolution

b)

It has no effect on the rate of dissolution

c)

It increases the rate of dissolution

d)

It first increases then decreases the rate of dissolution

75.

Given a solution of saltwater, identify the solute and solvent.

a)

Solute: Water, Solvent: Salt

b)

Solute: Salt, Solvent: Water

c)

Solute: Water, Solvent: Carbon dioxide

d)

Solute: Carbon dioxide, Solvent: Water

76.

Predict what will happen to the rate of dissolution if the temperature of the solvent is decreased.

a)

The rate of dissolution will increase

b)

The rate of dissolution will decrease

c)

The rate of dissolution will remain the same

d)

The rate of dissolution will first increase then decrease

77.

A student dissolves sugar in water and notices that it dissolves faster when stirred. Explain why this happens.

a)

Stirring decreases the temperature of the solution

b)

Stirring increases the surface area of the solute

c)

Stirring increases the interaction between solute and solvent particles

d)

Stirring decreases the surface area of the solute

78.

What is the primary characteristic of a pure substance?

a)

It contains a mixture of different substances

b)

It has the same atomic makeup and chemical properties throughout

c)

It can be separated into different components by physical means

d)

It is always a solid

79.

Compare the rate of dissolution of a solid solute in hot water versus cold water.

a)

The rate is higher in cold water

b)

The rate is higher in hot water

c)

The rate is the same in both

d)

The rate is higher in cold water initially, then higher in hot water

80.

A student adds a solid solute to water and observes that it dissolves faster when the solute is crushed into smaller pieces. Explain why this occurs.

a)

Crushing the solute decreases its surface area

b)

Crushing the solute increases its surface area

c)

Crushing the solute decreases the temperature of the solution

d)

Crushing the solute increases the temperature of the solution

81.

Explain why carbon dioxide is considered a solute in soda.

a)

Because it is the substance that dissolves other substances

b)

Because it is the substance being dissolved in water

c)

Because it is a solid

d)

Because it is a liquid

82.

When you dye Easter eggs, you mix food coloring and vinegar into boiling water to create the dye. Is this considered an aqueous solution?

a)

yes

b)

no

83.

What is the role of a solvent in a solution?

a)

To dissolve the solute

b)

To increase the pressure

c)

To decrease the temperature

d)

To act as a filter

84.
The concentration of a mixture can be increased in which of the following ways?
a)
Heating the mixture
b)
Adding more water “solvent”
c)
Adding more powder “solute”
d)
Stirring the mixture
85.

What does the concentration of a solution measure?

a)

The amount of solvent in a given volume of solution

b)

The temperature of the solution

c)

The amount of solute in a given volume of solution

d)

The pressure applied to the solution

86.

Which of the following actions will NOT

increase the rate of dissolution

(dissolving)?

a)

Stirring the solution

b)

Decreasing the temperature

c)

Increasing the surface area of the

solute

d)

Increasing the temperature

87.

What is the solvent in an aqueous solution?

a)

Salt

b)

Water

c)

Sugar

d)

Carbon dioxide

88.

Which of the following best describes a homogeneous mixture?

a)

A mixture where the components are not uniformly distributed

b)

A mixture where the components are uniformly distributed

c)

A mixture of solids only

d)

A mixture of gases only

89.

Describe the effect of increasing temperature on the rate of dissolution of a solid solute in water.

a)

It decreases the rate of dissolution

b)

It has no effect on the rate of dissolution

c)

It increases the rate of dissolution

d)

It first increases then decreases the rate of dissolution

90.

Explain how surface area affects the rate of dissolution of a solid solute in an aqueous solution.

a)

Larger surface area decreases the rate of dissolution

b)

Larger surface area increases the rate of dissolution

c)

Surface area has no effect on the rate of dissolution

d)

Smaller surface area increases the rate of dissolution

91.

Which of the following is an example of a solute in an aqueous solution?

a)

Water

b)

Salt

c)

Air

d)

Oil

92.

How does agitation (stirring) affect the rate of dissolution of a solid solute in water?

a)

It decreases the rate of dissolution

b)

It has no effect on the rate of dissolution

c)

It increases the rate of dissolution

d)

It first increases then decreases the rate of dissolution

93.

Given a solution of saltwater, identify the solute and solvent.

a)

Solute: Water, Solvent: Salt

b)

Solute: Salt, Solvent: Water

c)

Solute: Water, Solvent: Carbon dioxide

d)

Solute: Carbon dioxide, Solvent: Water

94.

Predict what will happen to the rate of dissolution if the temperature of the solvent is decreased.

a)

The rate of dissolution will increase

b)

The rate of dissolution will decrease

c)

The rate of dissolution will remain the same

d)

The rate of dissolution will first increase then decrease

95.

A student dissolves sugar in water and notices that it dissolves faster when stirred. Explain why this happens.

a)

Stirring decreases the temperature of the solution

b)

Stirring increases the surface area of the solute

c)

Stirring increases the interaction between solute and solvent particles

d)

Stirring decreases the surface area of the solute

96.

What is the primary characteristic of a pure substance?

a)

It contains a mixture of different substances

b)

It has the same atomic makeup and chemical properties throughout

c)

It can be separated into different components by physical means

d)

It is always a solid

97.

A student adds a solid solute to water and observes that it dissolves faster when the solute is crushed into smaller pieces. Explain why this occurs.

a)

Crushing the solute decreases its surface area

b)

Crushing the solute increases its surface area

c)

Crushing the solute decreases the temperature of the solution

d)

Crushing the solute increases the temperature of the solution

98.

Explain why carbon dioxide is considered a solute in soda.

a)

Because it is the substance that dissolves other substances

b)

Because it is the substance being dissolved in water

c)

Because it is a solid

d)

Because it is a liquid

99.

What is the main difference between a solution and a mixture?

a)

Solutions can only be liquids, while mixtures can be in any state of matter

b)

Solutions are always clear, while mixtures are cloudy

c)

Solutions are homogeneous, while mixtures can be heterogeneous

d)

Mixtures can be separated by physical means, while solutions cannot

100.
Which will dissolve the slowest
a)
powdered sugar in hot water
b)
Powdered sugar in cold water
c)
sugar cubes in hot water
d)
sugar cubes in cold water

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