5. 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. 6. Which of the following is a physical appearance of a substance? A. Complicated B. Homogeneous C. Heterogeneous D. Non-uniform 7. Which one is the best way to determine whether an unknown sample is a substance or a mixture? A. knowing its density. B. tasting the given sample. C. observing its physical appearance. D. testing its melting and boiling point. 8. Which is NOT a technique to separate components of mixture? A. Condensation B. Distillation C. Evaporation D. Filtration 9. Which of the following is a heterogeneous mixture? A. Air B. Oil in water C. Stainless steel D. Soft drink​