Mixtures and Pure Substances
Explore the fundamental concepts of mixtures and pure substances, including elements, compounds, homogeneous, and heterogeneous mixtures, with this Grade 8 science worksheet.
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Mixtures and Pure Substances
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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 a pure substance?
Saltwater
Air
Gold
Sand
2. A homogeneous mixture is also known as a:
Suspension
Colloid
Solution
Compound
3. An is a pure substance that cannot be broken down into simpler substances by chemical means.
4. A is formed when two or more elements are chemically combined in a fixed ratio.
5. In a heterogeneous mixture, the components are distributed and can often be easily distinguished.
6. Water (H₂O) is an example of an element.
True
False
7. A salad is a good example of a homogeneous mixture.
True
False
8. Differentiate between a pure substance and a mixture.
9. Provide two examples of a heterogeneous mixture and explain why they are considered heterogeneous.
Match each term on the left with its definition on the right.
10. Element
a. Two or more substances physically combined
11. Compound
b. A pure substance made of only one type of atom
12. Mixture
c. A mixture with a uniform composition throughout
13. Homogeneous Mixture
d. Two or more elements chemically combined