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Chemical Reactions Assessment Worksheet

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Chemical Reactions Assessment Worksheet

Read each task carefully. Show your thinking for equation questions. Use the observations and evidence provided to decide whether a chemical reaction has occurred.

Read the evidence

A group investigates four changes. They record what they see, but do not touch or taste any materials.

Test

Observation

Ice melts into liquid water.

Two clear liquids mix; a cloudy solid appears.

A metal surface slowly turns reddish-brown.

A sugar cube is crushed into small pieces.

1.From tests A–D, which two observations are the clearest evidence that new substances have formed? Name each test and explain the clue.

2.Mere mixes baking soda with vinegar in an open container. It fizzes. What is the best explanation for the bubbles?

A gas is being produced in a chemical reaction.
The vinegar is simply changing into a solid.
The baking soda is melting.
The bubbles prove that the mixture is boiling.

3.True or false: A change in colour or temperature can be evidence of a chemical reaction, but neither clue alone proves that a new substance formed.

TrueFalse

Atoms and equations

Chemical equations use symbols and coefficients to show how atoms are rearranged during reactions.

4.In the equation 2H₂ + O₂ → 2H₂O, what does the coefficient 2 in front of H₂O tell you?

There are two water molecules.
Each water molecule has two oxygen atoms.
The reaction uses two grams of water.
Water contains two different elements.

5.Balance the equation by adding whole-number coefficients: ___ Mg + ___ O₂ → ___ MgO. Then count the magnesium and oxygen atoms on each side.

6.Balance the equation: ___ Na + ___ Cl₂ → ___ NaCl. Use the smallest whole-number coefficients.

7.Calcium carbonate breaks down when heated: CaCO₃ → CaO + CO₂. Is this a synthesis reaction or a decomposition reaction? Explain how the equation shows this.

8.A student says, “Balancing an equation changes the substances in the reaction.” Explain why this is incorrect and name the law that balanced equations reflect.

Explain and investigate

Use precise science ideas to support your answers.

9.Compare a physical change with a chemical change. Give one example of each and explain how the examples differ.

10.Plan a safe investigation to test whether mixing baking soda and vinegar produces a gas. State what you would do, what you would observe, and one safety rule. Do not seal the reaction in a rigid container.

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Chemical Reactions Assessment Worksheet

Chemical Reactions Assessment Worksheet

Read the evidence

Atoms and equations

Explain and investigate

3 printable pages

About This Worksheet

Free in Kuraplan

Print-Ready

AI-Generated

For Teachers & Parents

Need a custom version of this worksheet?

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