Classification and Changes in Matter
Explore the classification of matter, physical and chemical changes, and states of matter with this Grade 7 Science worksheet.
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Classification and Changes in Matter
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Read each question carefully and answer to the best of your ability. Use complete sentences for short answer questions.
1. Which of the following is an example of a physical change?
Burning wood
Rusting iron
Melting ice
Baking a cake
2. What is the fundamental difference between a pure substance and a mixture?
Pure substances are always solids, mixtures are always liquids.
Pure substances have a fixed composition, mixtures have variable compositions.
Pure substances can be separated by physical means, mixtures cannot.
Mixtures are always homogeneous, pure substances are always heterogeneous.
3. The process of a liquid turning into a gas is called .
4. A substance that cannot be broken down into simpler substances by chemical means is an .
5. When two or more substances are chemically combined, they form a .
6. All mixtures are homogeneous.
True
False
7. A chemical change results in the formation of new substances.
True
False
8. Describe the difference between an element and a compound.
9. Observe the image below showing the transitions between states of matter. Based on the diagram, describe what happens to the particles of a substance when it undergoes 'freezing'.
