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Chemical Properties — Quiz Answers

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1
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What is the outcome of all chemical changes when two substances are combined?

A
A new substance forms with identical properties.
B
The two substances release an odor.
C
A new substance forms with different properties.
D
The two substances change color.
2
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A scientist is examining an unknown solid. Which procedure would most likely help determine a chemical property of the substance?

A
hitting it with a hammer to determine if it breaks or bends
B
placing it in water to find out whether or not it dissolves
C
heating it to find the temperature at which it melts
D
exposing it to a flame to see if it catches on fire
3

In a science lab, Cash mixes two clear liquids together in a beaker. Bubbles are produced, and a white solid forms and settles to the bottom. He plans to heat the beaker over low heat and make more observations. Which statement is most likely correct?

A
A chemical change occurred, so even if Cash heats it, the white solid will remain.
B
A physical change occurred, so even if Cash heats it, the white solid will remain.
C
A chemical change occurred, so if Cash heats it, the white solid will dissolve to form the original mixture of clear liquids.
D
A physical change occurred, so if Cash heats it, the white solid will dissolve to form the original mixture of clear liquids.
4

Which statement best describes chemical properties of matter?

A
Chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.
B
Chemical properties, such as reactivity, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.
C
Chemical properties, such as density, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.
D
Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.
5

In a science demonstration, a teacher mixed zinc Zn with hydrogen chloride HCl in a flask and quickly attached a balloon over the mouth of the flask. Bubbles formed in the solution and the balloon inflated. What most likely occurred during this demonstration?

A
Either Zn or HCl , but not both, retained its identity.
B
Evaporation of one of the substances occurred.
C
The Zn and HCl both retained their identity.
D
One or more new substances formed.
6

Which laboratory activity involves a chemical change?

A
leaving a copper penny in vinegar until it turns green
B
boiling saltwater for several minutes until only solid salt remains
C
crushing a rock with a hammer to extract mineral deposits
D
extracting iron filings from a sand mixture using a magnet
7

Which statement best describes what happens during a chemical change?

A
The physical properties of a substance change, but its chemical properties remain the same.
B
Both the identity and the properties of a substance change.
C
The chemical properties of a substance change, but its physical properties remain the same.
D
Some properties of a substance change, but its identity remains the same.
8

Which use of iron is due to its chemical properties?

A
changing from solid to liquid if heated to 1 comma 538 times degree C
B
conducting electricity and heat
C
changing from liquid to gas at 2 comma 862 times degree C
D
producing colored sparks in fireworks
9

Which event always involves a chemical change?

A
conducting
B
boiling
C
burning
D
melting
10

Which characteristic of a substance is considered a chemical property?

A
its boiling point
B
its reactivity
C
its conductivity
D
its density
11

Which statement best describes chemical properties of matter?

A
Chemical properties, such as density, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.
B
Chemical properties, such as combustibility, are generally observed as the identity of a substance changes and one or more new substances form.
C
Chemical properties, such as boiling point, are generally observed as the identity of a substance changes and one or more new substances form.
D
Chemical properties, such as reactivity, must be observed when a substance is in its natural state at room temperature and normal atmospheric pressure.
12

In a science demonstration, a teacher mixed zinc Zn with hydrogen chloride HCl in a flask and quickly attached a balloon over the mouth of the flask. Bubbles formed in the solution and the balloon inflated. What most likely occurred during this demonstration?

A
Either Zn or HCl , but not both, retained its identity.
B
Evaporation of one of the substances occurred.
C
One or more new substances formed.
D
The Zn and HCl both retained their identity.
13

Which event always involves a chemical change?

A
burning
B
melting
C
conducting
D
boiling
14

Which laboratory activity involves a chemical change?

A
leaving a copper penny in vinegar until it turns green
B
boiling saltwater for several minutes until only solid salt remains
C
extracting iron filings from a sand mixture using a magnet
D
crushing a rock with a hammer to extract mineral deposits
15

What is the outcome of all chemical changes when two substances are combined?

A
The two substances release an odor.
B
A new substance forms with different properties.
C
The two substances change color.
D
A new substance forms with identical properties.
16

In a science lab, Cash mixes two clear liquids together in a beaker. Bubbles are produced, and a white solid forms and settles to the bottom. He plans to heat the beaker over low heat and make more observations. Which statement is most likely correct?

A
A chemical change occurred, so if Cash heats it, the white solid will dissolve to form the original mixture of clear liquids.
B
A chemical change occurred, so even if Cash heats it, the white solid will remain.
C
A physical change occurred, so if Cash heats it, the white solid will dissolve to form the original mixture of clear liquids.
D
A physical change occurred, so even if Cash heats it, the white solid will remain.
17

Which use of iron is due to its chemical properties?

A
producing colored sparks in fireworks
B
conducting electricity and heat
C
changing from solid to liquid if heated to 1 comma 538 times degree C
D
changing from liquid to gas at 2 comma 862 times degree C
18

Which characteristic of a substance is considered a chemical property?

A
its reactivity
B
its density
C
its boiling point
D
its conductivity
19

Which statement best describes what happens during a chemical change?

A
The physical properties of a substance change, but its chemical properties remain the same.
B
The chemical properties of a substance change, but its physical properties remain the same.
C
Some properties of a substance change, but its identity remains the same.
D
Both the identity and the properties of a substance change.
20

A scientist is examining an unknown solid. Which procedure would most likely help determine a chemical property of the substance?

A
hitting it with a hammer to determine if it breaks or bends
B
heating it to find the temperature at which it melts
C
exposing it to a flame to see if it catches on fire
D
placing it in water to find out whether or not it dissolves

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