AnswersPBCSD_Grade_Forgiveness_2003310_Physical Science_S1_2022Unit Test

Unit Test — Unit test Answers

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Which state of matter consists of ionized particles?

A
solid
B
liquid
C
gas
D
plasma
2
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To what extent do covalent compounds conduct electricity?

A
always
B
usually
C
rarely
D
never
3

Which procedure would best allow a scientist to observe a chemical property of hydrochloric acid (HCl) solution?

A
cooling the HCl solution until it becomes solid, and measuring this temperature
B
adding zinc to the HCl solution and observing whether or not bubbles are produced
C
placing a conductivity probe into a beaker of HCl solution to determine if it conducts electricity
D
measuring the mass of and volume of a sample of HCl solution to find its density
4

Which is the process by which a gas changes to a solid?

A
deposition
B
evaporation
C
freezing
D
sublimation
5

Calcium carbonate (CaCO3) is a white solid with no odor. When CaCO3 is heated, the resulting substances are calcium oxide (CaO) and carbon dioxide (CO2). CaO is a white to gray solid with no odor, and CO2 is a gas with no odor and color.Which statement describes CaCO3?

A
It is a diatomic molecule that can’t be broken down by physical means.
B
It is a diatomic molecule that can’t be broken down by chemical means.
C
It is a compound that can be broken down by physical means.
D
It is a compound that can be broken down by chemical means.
6

The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance gain energy during a change of state. Before the change, the atoms are close together and cannot slide past one another. After the change, the substance can fill its container.

Question illustration
A
L
B
M
C
N
D
O
7

Which gas law describes the relationship between temperature and pressure at a constant volume?

A
Boyle’s law
B
Charles’s law
C
Gay-Lussac’s law
D
combined gas law
8

Tijuan mixed a solid and a liquid together in a beaker. He determined that a chemical change occurred.

A
ice mixed into warm oil, because the change of state that occurred when the ice melted cannot be reversed
B
baking soda mixed into vinegar, because the production of bubbles indicates that a new substance formed
C
sugar mixed into hot water, because the disappearance of solid indicates that the chemical identity of the sugar changed
D
sand mixed into water, because when sand was added the mass of the beaker increased
9

Substance X is placed in a cup. Its shape does not change. It is then placed on a plate; its shape still does not change.

A
solid.
B
liquid.
C
gas.
D
plasma.
10

Which describes a feature of the physical changes of all substances?

A
can dissolve in water
B
can conduct heat and electricity
C
rearranges atoms to form new substances
D
does not change the identity of a substance
11

Which is a characteristic of all ions?

A
They are metals.
B
They have a charge.
C
They are made of two or more types of atoms.
D
They form chemical bonds through electron sharing.
12

The density of solid aluminum is 2.70 g/cm3. If a 1g piece of aluminum is dropped in a cup of water, what will happen to the aluminum? (The density of water is 1.00 g/cm3.)

A
It will sink to the bottom.
B
It will float to the top.
C
It will hover in the middle.
D
It will move up and down.
13

Which statement is a description of Charles’s law?

A
The temperature and volume of a gas are directly proportional when pressure is constant.
B
The temperature and volume of a gas are inversely proportional when pressure is constant.
C
The volume and pressure of a gas are directly proportional when temperature is constant.
D
The volume and pressure of a gas are inversely proportional when temperature is constant.
14

There are several different models that represent compounds. One type of model is shown.

Question illustration
A
a structural formula
B
a chemical formula
C
a space-filling model
D
a ball-and-stick model
15

The table describes the properties of four compounds.Which compounds are most likely ionic?

Question illustration
A
compounds A and B
B
compounds B and C
C
compounds C and D
D
compounds D and A
16

Which describes the substances that form covalent bonds?

A
a metal and a metalloid
B
a metal and a nonmetal
C
two nonmetals
D
two metals
17

Rahul sees a flock of birds. He watches as the flying birds land in neat little rows on several power lines. Which change of state does the motion of the birds most closely model?

A
melting
B
vaporization
C
deposition
D
sublimation
18

Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?

A
If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.
B
If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.
C
If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.
D
If the substance is a liquid or solid, production of an odor would indicate a chemical change.
19

View the image of a paper clip in a bowl of water.

Question illustration
A
The paper clip is less dense than water.
B
The paper clip has less mass than water.
C
The water has high viscosity.
D
The water has surface tension.
20

Which is most likely a covalent compound?

A
LiF
B
MgS
C
NH3
D
CaCl2

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