1. What are the two (2) classes of matter? A. Atom and molecule B. Element and compound C. Plant and animal cells D. Substance and mixture 2. Which is true regarding water? A. Compound of element B. Element of gases C. Mixture of gases D. Substances of gases 3. What is the difference between a substance and a mixture? A. Substance can be separated while mixture cannot be separated. B. Substance has many components while mixture has one only. C. Substance is heterogeneous while mixture is homogeneous. D. Substance is pure while mixture is impure. 4. To separate salt from water in a seawater mixture, what process is used? A. Condensation B. Distillation C. Evaporation D. Filtration
