7th Grade TEKS Matter and Energy Review

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What is a chemical change?

Back

A process where substances combine or break apart to form new substances, often accompanied by energy changes.

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What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

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What is temperature?

Back

The measure of hotness or coldness of an object, typically measured in degrees Celsius or Fahrenheit.

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What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

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What is a compound?

Back

A substance formed when two or more elements chemically bond together in a fixed ratio.

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What are signs of a chemical reaction?

Back

Signs include color change, gas production, temperature change, and formation of a precipitate.

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What is rusting?

Back

A chemical reaction where iron reacts with oxygen and moisture to form iron oxide, commonly known as rust.

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What is a mixture?

Back

A combination of two or more substances where each retains its own properties and can be separated by physical means.

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What is a homogeneous mixture?

Back

A mixture that has a uniform composition throughout, such as saltwater.

Front

What is a heterogeneous mixture?

Back

A mixture where the components are not uniformly distributed, such as salad.