WCAS Prep 2025

WCAS Prep 2025

Assessment

Flashcard

Science

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. Example: Melting an ice cube.

2.

FLASHCARD QUESTION

Front

What happens to the total mass during a chemical reaction in a closed container?

Back

The total mass stays the same, as mass is conserved in a closed system.

3.

FLASHCARD QUESTION

Front

What adaptation helps a cactus survive in the desert?

Back

Deep roots and water storage tissues help a cactus survive by allowing it to access water and store it for dry periods.

4.

FLASHCARD QUESTION

Front

Why does a red apple appear red?

Back

A red apple appears red because it reflects red light and absorbs other colors of light.

5.

FLASHCARD QUESTION

Front

What is an adaptation?

Back

An adaptation is a characteristic that enhances an organism's ability to survive and reproduce in its environment. Example: A butterfly changing colors to blend in with its surroundings.

6.

FLASHCARD QUESTION

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

7.

FLASHCARD QUESTION

Front

What is mass conservation?

Back

Mass conservation is a principle stating that mass cannot be created or destroyed in a closed system during a chemical reaction.

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