Elements, Compounds and Mixtures (Grade 8)
Free printable Grade 8 science worksheet on elements, compounds and mixtures. Students classify substances, recall chemical symbols and count the atoms in a chemical formula.
Grade 8 · Science worksheet
Name
Date
Science
Elements, Compounds and Mixtures
Classify each substance, then read each formula. A number written after a symbol tells you how many atoms of that element are in one molecule.
- 1.What is the chemical symbol for gold?
- 2.Are the substances in a mixture chemically joined?
- a) yes
- b) no
- 3.Classify oxygen gas (O2): element, compound or mixture?
- a) element
- b) compound
- c) mixture
- 4.Can a compound be separated into its elements by a physical method such as filtering?
- a) yes
- b) no
- 5.Classify copper (Cu): element, compound or mixture?
- a) element
- b) compound
- c) mixture
- 6.What is a substance made of two or more different elements chemically joined called?
- 7.Ammonia has the formula NH3. How many atoms are in one molecule, and how many different elements does it contain?
- 8.Methane has the formula CH4. How many atoms are in one molecule, and how many different elements does it contain?
- 9.Water has the formula H2O. How many atoms are in one molecule, and how many different elements does it contain?
- 10.Carbon dioxide has the formula CO2. How many atoms are in one molecule, and how many different elements does it contain?
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