Question

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. *what property does distillation rely on to separate substances?

a. solubility
b. particle size
c. boiling point
d. density

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. **which technique would be best for collecting salt from a salt - water solution?

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

1. when would decanting be most useful?

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

1. *what property is most important when using a separatory funnel to separate liquids?

a. solubility
b. boiling point
c. density
d. color

Explanation:

1. Filtration is used to separate solids from liquids based on particle - size differences. Sand is a solid and water is a liquid, so filtration is suitable.
2. Distillation relies on differences in boiling points to separate substances.
3. Chromatography is useful for separating colored pigments in ink as different pigments have different affinities for the stationary and mobile phases.
4. Evaporation is used to collect salt from a salt - water solution as water evaporates leaving the salt behind.
5. Decanting is useful for removing water from cooked pasta as the water can be carefully poured off leaving the solid pasta behind.
6. When using a separatory funnel to separate liquids, density is the most important property as liquids of different densities will form separate layers.

Answer:

1. C. Filtration
2. C. Boiling point
3. B. Colored pigments in ink
4. C. Evaporation
5. B. Removing water from cooked pasta
6. C. Density