6. C.Heterogeneous
7. D.Testing its melting and boiling point
8. A.Condensation
Hope this helps
Explanation:
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
