Chemical Reactions

Chemical Reactions

Assessment

Flashcard

Chemistry

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: Getting a haircut.

2.

FLASHCARD QUESTION

Front

What is a chemical change?

Back

A chemical change occurs when a substance transforms into a different substance with different properties. Example: Rust forming on metal.

3.

FLASHCARD QUESTION

Front

What is the formula to produce hydrogen gas?

Back

To produce hydrogen gas, you need a metal such as magnesium and an acid such as hydrochloric acid.

4.

FLASHCARD QUESTION

Front

What happens to a candle placed under a jar?

Back

The candle goes out as it uses up the oxygen and releases carbon dioxide.

5.

FLASHCARD QUESTION

Front

How many molecules are represented in the chemical formula H2O?

Back

There are 2 molecules of hydrogen and 1 molecule of oxygen in H2O.

6.

FLASHCARD QUESTION

Front

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

Back

A physical change does not change the substance's chemical identity, while a chemical change results in the formation of new substances.

7.

FLASHCARD QUESTION

Front

What is an example of a physical change?

Back

Examples of physical changes include melting ice, boiling water, and breaking glass.

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