Unit 2 Review

What does this illustrate

• Elements

• Compunds

• Mixture of Elements and Compunds

• Mixture of Compounds

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Which statement is true about compounds?

• a pure substance where two or more elements are chemically combined

• a homogenous mixture of 2 or more elements

• a pure substance containing only one type of atom

• a heterogeneous mixture of 2 or more elements chemically combined

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What does this pic illustrate?

• Element

• Mixture of Compunds

• Mixture of elemets

• Compounds

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What is considered the simplest form of matter?

• Compounds

• Colloids

• Solutions

• Elements

The chart below lists some substances and their symbols. How many of these substances are examples of elements?

• 1

• 2

• 3

• 4

What is the relationship between molecules and atoms?

• Molecules are combinations of two or more atoms.

• Molecules are the parts that make up atoms

• Molecules are the gaseous parts of atoms

• Molecules are atoms that have a positive charge

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In the diagrams provided, the circles of different colors represent the atoms of different elements. Which diagram represents a mixture?

• I

• II

• III

• IV

Mixtures are different than pure substances because mixtures-

• have lower boiling points

• can be separated physically

• are less dense than pure substances

• contain only one type of atom

Beatriz wants to make a mixture out of her bowl of blueberries. Which of the following would turn her bowl of blueberries into a mixture?

• adding more blueberries to the bowl

• adding raspberries to the bowl

• cutting up the blueberries

• mashing the blueberries

Humans absorb oxygen from the air they breathe in and exhale carbon dioxide gas, CO2. Carbon dioxide gas is

• an element made of carbon and oxygen atoms.

• a solution made of carbon and oxygen atoms.

• a compound of carbon and oxygen atoms.

• a mixture of carbon and oxygen atoms.

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