Physical and Chemical Changes

Physical and Chemical Changes

Assessment

Flashcard

Science

5th - 8th Grade

Hard

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15 questions

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1.

FLASHCARD QUESTION

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 state (like melting or freezing), shape, or size.

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 rearrangement of atoms and is often accompanied by energy changes, color changes, gas production, or the formation of a precipitate.

3.

FLASHCARD QUESTION

Front

Can you give an example of a physical change?

Back

An example of a physical change is the melting of ice into water. The chemical composition of water remains the same (H2O), but its state changes from solid to liquid.

4.

FLASHCARD QUESTION

Front

Can you give an example of a chemical change?

Back

An example of a chemical change is the rusting of iron. When iron reacts with oxygen in the presence of moisture, it forms iron oxide (rust), which is a different substance.

5.

FLASHCARD QUESTION

Front

What are some indicators of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production (bubbles), formation of a precipitate, and changes in odor.

6.

FLASHCARD QUESTION

Front

What is the law of conservation of mass in relation to chemical changes?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.

7.

FLASHCARD QUESTION

Front

How can you differentiate between physical and chemical changes?

Back

You can differentiate between physical and chemical changes by observing whether the substance's chemical identity changes. If it does, it's a chemical change; if it doesn't, it's a physical change.

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