1. Which of the following best describes a mixture? A. It is a chemical combination of two or more elements. B. It is a physical combination of two or more substances. C. Its components are present in fixed proportion. D. It is a made up of elements and compounds.
2. You mix soil and water in a transparent glass. After a few days, the soil has settled at the bottom of the glass and the water is at the top. What classification of matter is this? A. compounds B. elements C. mixtures D. pure substance
3. Table sugar dissolves in water. How will you describe the resulting mixture? A. has two phases B. light cannot pass through C. heterogeneous in appearance D. homogeneous in appearance
4. Which of the following properties identifies a pure substance? A. can be changed from solid to gas and back to solid B. has a constant boiling temperature C. is tasteless and odorless D. soluble in water
5. Seawater is a mixture. Which of the following best describes the components of seawater? A. They cannot be separated by physical means. B. They combine in a fixed ratio by mass. C. They have no definite proportion. D. They are chemically combined.
