Physical vs Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in shape, size, or state of matter.

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 rearrangement of atoms and can include processes like burning, rusting, or digestion.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes the production of light, gas, a change in temperature, or the formation of a precipitate.

Front

What evidence indicates a physical change has occurred?

Back

Evidence of a physical change includes changes in shape, size, or state of matter, such as melting, freezing, or dissolving.

Front

Is getting a haircut a physical or chemical change?

Back

Getting a haircut is a physical change because it alters the appearance of hair without changing its chemical structure.

Front

What happens to the original substances in a chemical change?

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In a chemical change, the original substances cannot be easily reverted back to their original states without using chemical reactions.

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What is an example of a chemical change?

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An example of a chemical change is a copper penny turning greenish due to oxidation.

Front

What is an example of a physical change?

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An example of a physical change is ice melting into water.

Front

Can physical changes be reversed?

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Yes, physical changes can often be reversed, such as freezing water to make ice.

Front

Can chemical changes be reversed?

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Chemical changes are usually not reversible by simple physical means; they require chemical reactions to revert to original substances.