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Chemical Changes and Reactions Quiz

Authored by Edudigm STEMpowered

Chemistry

7th Grade

Used 1+ times

Chemical Changes and Reactions Quiz
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40 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of these is a physical change?

Melting of ice

Rusting of iron

Cooking an egg

Burning of wood

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What proves that a chemical change has occurred during rusting?

Iron becomes colder

Iron changes shape

A new brown substance forms

The iron gets wet

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is not a sign of chemical change?

Change in color

Gas formation

Melting

Formation of a new substance

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Respiration in our body is a chemical reaction because:

It makes us tired

It mixes air and food

It produces new substances and releases energy

It keeps our lungs working

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What type of reaction is photosynthesis?

Breakdown reaction

Endothermic reaction

Neutralization

Rusting

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of these best describes fermentation?

Formation of a solid from a liquid

Breaking food using oxygen

A slow chemical change caused by microbes

Turning gas into liquid

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is common between respiration and combustion (burning)?

Both are physical changes

Both produce light

Both need oxygen and release energy

Both happen only in machines

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