Answer to Question #69361 in Physical Chemistry for kingsley

Question #69361

Question 17 : A sample of a salt and water solution is homogeneous throughout. Is this sample a mixture or a pure substance?
a) a mixture, because it can have a variable composition
b) a pure substance, since it is the same throughout
c) a pure substance, because it has a definite composition
d) a mixture, because it has a fixed, definite composition

Question 20 : In order to dissolve the greatest amount of sugar in a cup of water, you should
a) use sugar crushed into small pieces, and heat the water
b) use sugar in large pieces, and cool the water
c) use sugar in large pieces, and heat the water
d) use sugar crushed into small pieces, and cool the water

Expert's answer

Question 17:
d) a mixture, because it has a fixed, definite composition
Question 20:
a) use sugar crushed into small pieces, and heat the water