Question

name: chemistry: u1l4 mixture types q1 part 3: multiple choice questions 1. *which separation technique is best for separating sand from water? a. distillation b. chromatography c. filtration d. evaporation 2. what property does distillation rely on to separate substances? a. solubility b. particle size c. boiling point d. density 3. chromatography is most useful for separating: a. liquids from solids b. colored pigments in ink c. water from salt d. oil from water 4. which technique would be best for collecting salt from a salt - water solution? a. filtration b. chromatography c. evaporation d. distillation 5. when would decanting be most useful? a. separating colored dyes b. removing water from cooked pasta c. purifying alcohol d. filtering muddy water 6. *what property is most important when using a separatory funnel to separate liquids? a. solubility b. boiling point c. density d. color

Explanation:

1. Sand is insoluble in water and has larger particles. Filtration can separate solids from liquids based on particle - size differences.
2. Distillation separates substances based on differences in boiling points. Substances with different boiling points vaporize and condense at different temperatures.
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 the best technique for collecting salt from a salt - water solution. Water evaporates leaving the salt behind.
5. Decanting is useful for separating a liquid from a solid when the solid has settled at the bottom, like removing water from cooked pasta.
6. When using a separatory funnel to separate liquids, density is the most important property as liquids of different densities 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