AnswersLA-Chemistry AElements, Compounds, and Mixtures

Atomic Numbers and Electron Configurations Answers

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1
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Which is a substance that is made up of only one type of atom?

A
compound
B
element
C
solution
D
mixture
2
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A teacher makes the following statement.“Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.”What topic is the teacher most likely talking about?

A
distillation of a mixture
B
filtration of a pure substance
C
evaporation of a mixture
D
sorting of a pure substance
3

Which is a characteristic of mixtures?

A
They are chemically bonded together.
B
They can be classified as pure substances.
C
They have fixed ratios between their components.
D
They can be separated by physical processes.
4

Which is a pure substance?

A
soda
B
gasoline
C
salt water
D
carbon dioxide
5

Which sample is a pure substance?

A
zinc oxide
B
sugar dissolved in water
C
pond water
D
soil
6

The chemical formula for an emerald is Be3Al2(SiO3)6. An emerald can be described as

A
a pure substance because it is a compound.
B
a pure substance because it is an element.
C
an impure substance because it is chemically combined.
D
an impure substance because it is a mixture.
7

Which best describes an element?

A
a pure substance
B
a type of a mixture
C
a pure compound
D
an impure substance

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