What is a physical change?
Physical and Chemical Changes

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Science
•
7th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include melting, freezing, and dissolving.
2.
FLASHCARD QUESTION
Front
What is a chemical change?
Back
A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and cannot be reversed by simple physical means. Examples include rusting and burning.
3.
FLASHCARD QUESTION
Front
What is an example of a physical change?
Back
Crumpled paper, pencil sharpening, and melting ice are examples of physical changes.
4.
FLASHCARD QUESTION
Front
What is an example of a chemical change?
Back
Baking cookies is an example of a chemical change because it involves a chemical reaction that produces new substances.
5.
FLASHCARD QUESTION
Front
What evidence indicates a chemical change has occurred?
Back
Evidence of a chemical change includes a change in color, the production of gas (bubbles), the formation of a precipitate (solid), and a change in temperature.
6.
FLASHCARD QUESTION
Front
What is rust?
Back
Rust is a chemical change that occurs when iron reacts with oxygen and moisture in the air, forming iron oxide.
7.
FLASHCARD QUESTION
Front
Is dissolving sugar in water a physical or chemical change?
Back
Dissolving sugar in water is a physical change because no new substance is formed and it can be reversed.
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