
Chemical Changes and Reactions Quiz
Quiz
•
Chemistry
•
7th Grade
•
Practice Problem
•
Easy
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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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