Worksheet: Elements, Compounds, and Mixtures

**Instructions: Determine whether each of the following substances is an element, compound, or mixture. Write your answer next to each substance.

**1.** Water (H2O)
**2.** Oxygen (O2)
**3.** Carbon dioxide (CO2)
**4.** Table salt (NaCl)
**5.** Iron (Fe)
**6.** Air
**7.** Sugar (C12H22O11)
**8.** Gold (Au)
**9.** Brass
**10.** Lemonade
**11.** Hydrochloric acid (HCl)
**12.** Soil
**13.** Helium (He)
**14.** Carbon (C)
**15.** Milk

Remember:
– An **element** is a pure substance composed of atoms with the same atomic number.
– A **compound** is a substance formed by the chemical combination of two or more elements in a fixed ratio.
– A **mixture** is a combination of two or more substances that are not chemically combined and can be separated by physical means.

**Answers:**
1. Compound
2. Element
3. Compound
4. Compound
5. Element
6. Mixture
7. Compound
8. Element
9. Mixture
10. Mixture
11. Compound
12. Mixture
13. Element
14. Element
15. Mixture

Remember that compounds are formed through chemical reactions, while mixtures are physical combinations. Elements are substances that cannot be broken down into simpler substances by chemical means. Double-check your answers to ensure accuracy!

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