AnswersBCHS KY-Chemistry Section AUnit Test

Unit Test — Unit test Answers

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Which of these is an extensive property of a substance?

A
color
B
hardness
C
malleability
D
volume
2
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Which of these is an example of a physical change?

A
a banana ripening in the air
B
hydrogen burning in the air
C
zinc reacting with an acid
D
liquid water turning into vapor
3

Which is an example of a chemical change?

A
water evaporating from a puddle
B
cloth tearing when pulled
C
wood forming sawdust when cut
D
bread baking in an oven
4

Which is an intensive property of a substance?

A
density
B
volume
C
length
D
mass
5

Which of these is an example of a physical change?

A
sugar dissolving in warm water
B
iron rusting in the presence of moist air
C
wood burning in the presence of oxygen
D
baking soda reacting with acid to form a gas
6

Which of these is an example of investigating an intensive property?

A
weighing sand in a bag
B
measuring the length of wire
C
determining if a rock is magnetic
D
recording the volume of water in a cylinder
7

A student investigated some properties of lead and recorded the findings in the table below.PropertyObservationcolordull graydensity11.3 g/cm3volume of sample3.00 cm3melting point327°Creaction with airlead oxide forms on the surfaceelectrical conductivityconducts some electricityWhich statement is true with respect to the investigation?

A
The student investigated only the physical properties of lead.
B
The student investigated only the chemical properties of lead.
C
The student investigated more physical properties than chemical properties of lead.
D
The student investigated more chemical properties than physical properties of lead.
8

Which term refers to a property that depends only on the amount of a substance?

A
flammability
B
extensive
C
intensive
D
reactivity
9

A geochemist examines a piece of metal that he found in the soil. He performs tests to identify the metal from its density, electrical conductivity, and melting point. Which statement best describes his investigation?

A
He is identifying the metal using physical properties only.
B
He is identifying the metal using chemical properties only.
C
He is identifying the metal using physical properties and chemical properties.
D
He is identifying the metal using neither physical properties or chemical properties.
10

The table below shows the freezing points of four substances.SubstanceFreezing point (°C)benzene5.50water0.00butane–138nitrogen–210.The substances are placed in separate containers at room temperature, and each container is gradually cooled. Which of these substances will solidify before the temperature reaches 0°C?

A
benzene
B
water
C
butane
D
nitrogen
11

When a strip of magnesium metal is touched to a flame, a bright light and a whitish substance are produced. Why is the burning of magnesium considered a chemical change?

A
because the metal reaches a high temperature
B
because the metal begins to melt
C
because a new substance is formed
D
because the metal is malleable
12

Which commercial technology commonly uses plasmas?

A
a radio
B
a race car
C
a fluorescent light
D
a microwave oven
13

Which is an aspect of the kinetic-molecular theory and can be used to explain the compressibility of plasmas?

A
Particles move independently of one another and are widely spaced.
B
Particle kinetic energy increases with increasing temperature.
C
Particles exert no attractive or repulsive force on one another.
D
Particles always move even when they have fixed positions.
14

Which statement describes an extensive property of matter?

A
It changes with the color of a substance.
B
It changes when a new substance is formed.
C
It changes with the amount of sample that is present.
D
It changes with the composition of a substance.
15

Which statement best compares the melting point of butane (C4H10) with that of octane (C8H18)?

A
The melting points of both substances are identical.
B
The melting point is higher for butane.
C
The melting point is higher for octane.
D
The comparison of melting points cannot be made.
16

Which is a postulate of the kinetic-molecular theory?

A
Gas particles have a small volume relative to the spaces between them.
B
Gas particles have a large volume relative to the spaces between them.
C
Gas particles are very small in size and always move slowly.
D
Gas particles are very large in size and always move slowly.
17

Which statement describes a limitation of the kinetic-molecular theory for a gas?

A
The theory assumes that particles do not experience intermolecular forces.
B
The theory states that pressure is inversely proportional to volume.
C
The theory assumes that particles are in random and continuous motion.
D
The theory states that pressure increases with temperature.
18

Why do amorphous solids not have a long-range order in the arrangement of their particles?

A
Their formation involves very rapid cooling.
B
They do not have enough particles.
C
Their particles eventually change positions.
D
Their particles always stay in the same positions.
19

The diagrams show gases that are stored in two separate but similar containers.If both gases are at the same temperature, which one has the greater pressure?

Question illustration
A
gas 1 because the particles are moving much faster
B
gas 1 because it has fewer particles that are close together
C
gas 2 because it has more particles that are colliding
D
gas 2 because the particles have more space between them
20

Which sequence represents the relationship between pressure and volume of an ideal gas as explained by the kinetic-molecular theory?

A
more gas particles more collisions higher pressure
Option A
B
smaller volume crowded particles less collisions lower pressure
Option B
C
smaller volume crowded particles more collisions higher pressure
Option C
D
more gas particles more kinetic energy more volume higher pressure
Option D

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