What is a chemical change?
7th Grade TEKS Matter and Energy Review

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Science
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7th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
A process where substances combine or break apart to form new substances, often accompanied by energy changes.
2.
FLASHCARD QUESTION
Front
What is a physical change?
Back
A change that affects one or more physical properties of a substance without altering its chemical composition.
3.
FLASHCARD QUESTION
Front
What is temperature?
Back
The measure of hotness or coldness of an object, typically measured in degrees Celsius or Fahrenheit.
4.
FLASHCARD QUESTION
Front
What is an element?
Back
A pure substance that cannot be broken down into simpler substances by chemical means.
5.
FLASHCARD QUESTION
Front
What is a compound?
Back
A substance formed when two or more elements chemically bond together in a fixed ratio.
6.
FLASHCARD QUESTION
Front
What are signs of a chemical reaction?
Back
Signs include color change, gas production, temperature change, and formation of a precipitate.
7.
FLASHCARD QUESTION
Front
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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