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) (a)   compound contains carbon and is typically found in living systems.

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

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