Elements, Compounds, and Mixtures Test

1. Which of the following statements about elements and compounds is accurate?

• A. Elements are many different types of atoms together but compounds are just one type of atom.
• B. Elements are pure substances that cannot be broken down physically but compounds are pure substances that can be broken down physically.
• C. Elements are not found on the Periodic Table but compounds are found on the Periodic Table.
• D. Elements are pure substances that cannot be broken down chemically but compounds are pure substances that can be broken down chemically.

2. Which element is found in all organic compounds?

• A. Carbon (C)
• B. Nitrogen (N)
• C. Hydrogen (H)
• D. Oxygen (O)

3. The air that surrounds us is categorized as which of the following?

• A. Element
• B. Compound
• C. Mixture
• D. Organic compound

4. Which of the following could be the chemical formula for a compound?

• A. Na
• B. CO2
• C. H2 + O2
• D. Au

5. Which of the following could be the chemical formula for an element?

• A. Si2
• B. H2O
• C. C + O2
• D. C6H12O6

6. Which of the following could be the chemical formula for a mixture?

• A. Ne
• B. CO2
• C. H2
• D. NaCl + H2O

7. How could you separate a mixture of sand and water?

• A. Pick out each sand grain
• B. Allow the water to evaporate
• C. Drink the water
• D. This mixture cannot be separated

8. A(n) _______________ compound contains carbon and is typically found in living systems.

9. A(n) _______________ consists of two or more substances that are together, but not chemically combined.

10. A(n) _______________ is a pure substance that cannot be broken down chemically.