Question

q1 chemistry: u1l4 mixture types
part 3: multiple choice questions

1. **which separation technique is best for separating sand from water?

a. distillation
b. chromatography
c. filtration
d. evaporation

1. **chromatography is most useful for separating:

a. liquids from solids
b. colored pigments in ink
c. water from salt
d. oil from water

1. when would decanting be most useful?

a. separating colored dyes
b. removing water from cooked pasta
c. purifying alcohol
d. filtering muddy water

Explanation:

Question 1

To separate sand (solid) from water (liquid), filtration is used as it separates insoluble solids from liquids. Distillation is for separating liquids with different boiling points, chromatography for separating components in a mixture (like pigments), and evaporation for separating a dissolved solid from a liquid. So the best technique is filtration.

Chromatography is used to separate components of a mixture based on their different affinities for a stationary and mobile phase. Colored pigments in ink have different solubilities and can be separated by chromatography. Separating liquids from solids is filtration, water from salt is evaporation or distillation, and oil from water is decantation or using a separating funnel.

Decanting is used to separate a liquid from a solid (or two immiscible liquids) by carefully pouring off the liquid. Removing water from cooked pasta involves pouring off the water (decanting). Separating colored dyes is chromatography, purifying alcohol is distillation, and filtering muddy water is filtration.

Answer:

C. Filtration

Question 3