10. Which of the following is a property of mixture?
a. It has a definite composition.
b. It consists of a single phase.
c. It has a heterogeneous composition.
d. It can be chemically separated into its components.
11. Which of the following is a physical appearance of a
substance?
a. complicated b. homogeneous c. heterogeneous d. non-uniform
12. Which one is the best way to determine whether an unknown
sample is a substance or a mixtura?
a. Knowing its density
b. Tasting the given sample
c. Observing its physical appearance
d. Testing its melting and boiling point
13. Which is NOT a technique to separate components of
mixture? a. condensation b. distillation c. evaporation d. filtration
14. Which of the following is a heterogeneous mixture?
a. air b. oil in water c. stainless steel d. soft drink
15.What is/are true for substance and mixture?
1. Pure substance melts completely.
II. Pure substance has a varying boiling point.
III. Mixture does not melt completely.
IV. Mixture has a fixed boiling point.
a. I and II only b. I and III only c. II and IV only d. I and IV only​