Sam wants to distinguish between mixtures and pure substances. Classify each of the following as a pure substance, a homogeneous mixture, or a heterogeneous mixture.

Question

a) gasoline

b) air 

c) copper metal

d) oil and vinegar salad dressing 

Answer 1

a) gasoline - homogeneous mixture

b) air - homogeneous mixture

c) copper metal - pure substance

d) oil and vinegar salad dressing - heterogeneous mixture