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Applied Chemistry/Ice Cream Review

Total questions: 44

Worksheet time: 25mins

Name
Class
Date
1.

The atom is the smallest unit of a(n) _________________.

a)

element

b)

compound

c)

fraction

d)

none of these

2.

The molecule is the smallest unit of a(n) _________________ .

a)

compound

b)

element

c)

mixture

d)

none of these

3.

Each element has its own unique number of __________________.

a)

protons

b)

neutrons

c)

electrons

d)

nuclei

4.

What charge does a neutron have?

a)

positive

b)

negative

c)

neutral

5.

What two particles are in the nucleus of an atom?

a)

protons and electrons

b)

electrons and neutrons

c)

protons and neutrons

6.
Which of these is the electron?
a)
A
b)
B
c)
C
d)
D
7.

When adding a solute to water, the freezing point will

a)

increase

b)

decrease

c)

stay the same

8.
What is the atomic number of this atom?
a)
4
b)
5
c)
9
d)
none of the above
9.

Particles in a ______________________ move quickly and are far apart.

a)

gas

b)

solid

c)

liquid

10.

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.

11.
Which form of matter does not take the shape of its container?
a)
liquid
b)
gas
c)
solid
d)
air
12.
How is a gas defined?
a)
Indefinite shape, indefinite volume
b)
Definite shape, definite volume
c)
Found in stars
d)
Definite volume, indefinite shape
13.
What term describes a liquid changing to a solid?
a)
Deposition
b)
Sublimation
c)
Evaporation
d)
Freezing
14.
Define a liquid.
a)
Indefinite shape, indefinite volume
b)
Definite shape, definite volume
c)
Found in stars
d)
Definite volume, indefinite shape
15.
When a gas changes directly to a solid, the process is known as what?
a)
Sublimation
b)
Condensation
c)
Deposition
d)
Evaporation
16.

A pure substance composed of two or more different elements is

a)

element

b)

homogeneous mixture

c)

heterogeneous mixture

d)

chemical compound

17.

Anything that has mass and takes up space is an example of

a)

energy

b)

matter

c)

chemical change

d)

temperature

18.

Define sublimation.

a)

solid to liquid

b)

solid to gas

c)

gas to solid

d)

liquid to gas

19.

The average speed of molecules in a substance is called

a)

thermodynamics

b)

heat

c)

temperature

20.

The opposite phase of melting is

a)

Condensation

b)

Vaporization

c)

Sublimation

d)

Freezing

21.
This happens to water at 0 degrees Celsius.
a)
Boils
b)
Freezes
c)
Heats
d)
All of them
22.
The faster molecules move, 
a)
the higher the temperature
b)
the less temperature
c)
the same temperature
d)
I don't know
23.
The slower molecules move, 
a)
the higher the temperature
b)

the lower the temperature

c)
the same temperature
d)
I don't know
24.

Temperature is a measure of the average _____________ energy of the particles of a substance.

a)

potential

b)

kinetic

c)

gravitational

d)

heat

25.
Which of the following terms identifies the change from a liquid to gas?
a)
Vaporization
b)
Condensation
c)
Deposition
d)
Sublimation
26.
Phase change from a solid to a gas.
a)
sublimation
b)
deposition
c)
condensation
d)
evaporation
27.
Change from Gas to Solid is called........
a)
Sublimation
b)
Deposition
c)
Fusion
d)
condensation
28.
When molecules flow around each other, they are in this phase
a)
solid
b)
liquid
c)
gas
d)
plasma
29.
If this substance had kinetic energy ADDED, it would be in what phase?
a)
solid
b)
liquid
c)
gas
d)
plasma
30.
If you have a liquid that changes to a gas, explain it's freedom of movement in both phases.
a)
molecules move away from each other, then around each other
b)
molecules move in place, then around each other
c)
molecules move around each other, then away from each other
d)
molecules move around each other, then in place
31.
Before: molecules move around each other, After: molecules move in place
a)
Before, the substance was a solid and later a liquid.
b)
Before,the substance was a gas, and later a liquid.
c)
Before, the substance was a liquid and later a solid.
d)
Before,the substance was a liquid, and later a gas.
32.
If energy is taken out of the substance, and the substance changed into a liquid,
a)
the substance started as a solid
b)
the substance started as a liquid
c)
the substance stayed the same
d)
the substance started as a gas
33.
During a phase change what happens to temperature?
a)
it increases
b)
it decreases
c)
depends; if being heated it increases, if being cooled it decreases
d)
stays constant
34.
All changes in the state of matter of a substance requires a change in 
a)
mass
b)
temperature
c)
permission
d)
energy
35.

What happens to molecules when the temperature drops or lowers?

a)

The molecules get closer together

b)

The molecules start moving faster.

c)

The molecules stop moving.

d)

The molecules become smaller.

36.

Molecules are always moving no matter what phase they are in: solid, liquid, gas.

a)

True

b)

False

37.
The freezing point of a solution is ____ the freezing point of the pure solvent.
a)
the same as
b)
lower than
c)
higher than
d)
no relation to
38.

While making homemade ice cream, you add rock salt to the ice. Which choice below provides the best explanation for why this is done?

a)

Adding salt to the ice will lower the freezing point by creating a solution that's freezing point is lower than just the ice.

b)

Adding salt to the ice will lower the freezing point by creating a solution that's freezing point is higher than just the ice.

c)

Adding salt to the ice will raise the freezing point by creating a solution that's freezing point is lower than just the ice.

d)

Adding salt to the ice will raise the freezing point by creating a solution that's freezing point is higher than just the ice.

39.

Polar molecules have

a)

no charges.

b)

slight positive and negative charges on opposite ends of the molecules.

c)

only positive charges.

d)

either positive or negative charges, but not both.

40.

Consider the ice cream lab, select all that was present in the salt water solution

a)

polar water molecules

b)

polar salt molecules

c)

positive sodium ions

d)

negative chlorine ions

e)

positive chlorine ions

41.

How did the salt affect the melting/freezing point of the solid ice?

a)

it increased

b)

it decreased

c)

it didn't affect it

d)

none of these

42.

How did the salt affect the melting/freezing point of the liquid water?

a)

it increased

b)

it decreased

c)

it didn't affect it

d)

none of these

43.

The freezing point depression is caused by an increase in _______________ in the solution resulting in a greater total amount of energy that must be lost in order for the water to freeze.

a)

temperature

b)

energy

c)

particles

d)

all of these

44.

The charged ions from the salt interrupt the polar water molecules from _________________. This is one reason why the temperature of the salt water solution during the ice cream lab was able to drop below the freezing point of water.

a)

freezing

b)

melting

c)

slowing down

d)

getting into fixed positions

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