Elements, Compounds, and Mixtures
Understand the fundamental differences between elements, compounds, and mixtures, and learn how to classify various substances.
Includes
Standards
Elements, Compounds, and Mixtures
Name:
Date:
Score:
Read each question carefully and answer to the best of your ability.
1. Which of the following is a pure substance that cannot be broken down into simpler substances by chemical means?
Compound
Mixture
Element
Solution
2. A substance formed when two or more elements are chemically combined in a fixed ratio is called a:
Element
Mixture
Compound
Heterogeneous mixture
3. A mixture in which the components are uniformly distributed and indistinguishable is called a mixture.
4. The smallest unit of an element is an .
5. When iron rusts, it forms iron oxide, which is an example of a .
6. Air is an example of a homogeneous mixture.
True
False
7. A compound can be separated into its elements by physical means.
True
False
8. Explain the difference between a heterogeneous mixture and a homogeneous mixture, providing an example for each.
9. Describe why water (H₂O) is considered a compound and not an element or a mixture.
Match each term on the left with its correct definition on the right.
10. Element
a. Two or more substances physically combined
11. Compound
b. Pure substance made of only one type of atom
12. Mixture
c. Two or more elements chemically combined in a fixed ratio
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