Everything around us is made of matter, and matter can be classified into elements, compounds, and mixtures. Elements are the simplest form of matter and cannot be broken down further by chemical means (e.g., gold, oxygen). Compounds are formed when two or more elements chemically combine in a fixed ratio (e.g., water, $H_2O$, table salt, $NaCl$). Mixtures, on the other hand, are combinations of substances that are physically combined and can be separated by physical means; their composition isn't fixed (e.g., air, salad).
Match the term with its correct definition:
| Term | Definition |
|---|---|
| 1. Element | A. A substance made up of two or more elements chemically combined. |
| 2. Compound | B. A substance that cannot be broken down into simpler substances by chemical means. |
| 3. Mixture | C. A combination of substances that are physically combined. |
Answers: 1-B, 2-A, 3-C
Complete the following paragraph using the words: elements, compounds, mixtures, chemical, physical.
Matter can be classified into __________, __________ and __________. __________ are pure substances that cannot be broken down by __________ means. __________ are formed by the __________ combination of two or more __________.
Answers: elements, compounds, mixtures, Elements, chemical, Compounds, chemical, elements
Explain, in your own words, the key differences between a compound and a mixture. Give an example of each.
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