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Chemical reactions Quiz for Grade 9

10 science questions on chemical reactions with answers, written for Grade 9. Use it as it is, change any question, print it with an answer key, or give it online and let it grade itself.

1.
What is the main indicator that a chemical reaction has occurred? (Multiple choice)
  1. Change in shape
  2. Change in color
  3. Change in temperature only
  4. Change in size
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Change in color

A change in color often indicates a chemical reaction has taken place.
2.
Which of the following is a sign of an exothermic reaction? (Multiple choice)
  1. Releasing heat
  2. Absorbing heat
  3. Cooling down
  4. No temperature change
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Releasing heat

Exothermic reactions release heat to the surroundings.
3.
In a chemical equation, the substances on the left side are called: (Multiple choice)
  1. Reactants
  2. Catalysts
  3. Products
  4. Enzymes
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Reactants

Reactants are the starting substances in a chemical reaction.
4.
What role does a catalyst play in a chemical reaction? (Multiple choice)
  1. It speeds up the reaction without being consumed
  2. It changes the products formed
  3. It slows down the reaction
  4. It increases the reaction temperature
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It speeds up the reaction without being consumed

Catalysts speed up reactions without being used up.
5.
Which type of reaction involves the combination of two or more substances to form one product? (Multiple choice)
  1. Combustion
  2. Single displacement
  3. Synthesis
  4. Decomposition
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Synthesis

Synthesis reactions combine substances into one product.
6.
In a decomposition reaction, one compound breaks down into two or more simpler substances. (True or false)
  1. True
  2. False
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True

Decomposition reactions break compounds into simpler parts.
7.
Chemical reactions always produce gases as products. (True or false)
  1. True
  2. False
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False

Not all chemical reactions produce gases; some produce solids or liquids.
8.
Name the process where a substance combines with oxygen and releases energy. (Identification)
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Combustion

Combustion is the process of burning with oxygen releasing energy.
9.
In a balanced chemical equation, the number of atoms of each element is the same on both sides of the _____. (Fill in the blank)
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equation

Balance ensures atoms are equal on both sides of the equation.
10.
Match each type of chemical reaction with its description. (Matching type)
1. Synthesis
A. One compound breaks down into simpler substances
2. Decomposition
B. One element replaces another in a compound
3. Single displacement
C. Two or more substances combine to form one product
4. Combustion
D. Substance reacts with oxygen releasing energy
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1 = Two or more substances combine to form one product; 2 = One compound breaks down into simpler substances; 3 = One element replaces another in a compound; 4 = Substance reacts with oxygen releasing energy

Each reaction type has a unique description.