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What is the definition of a mixture?

• Mixture consists of two or more substances that are not chemically combined

• Mixture consists of two or more substances that are chemically combined

• Mixture consists of two or more substances that can chemically react with each other

• Mixture consists of two or more substances that can be decomposed into its constituents

Which method is most effective separating a mixture of iron filings and sulfur?

• Simple distillation

• Evaporation to dryness

• Filtration

• Magnetic attraction

Which method(s) is/are most effective in recovering chalk particles from a mixture of chalk and water? (You may choose more than one option)

• Simple distillation

• Evaporation to dryness

• Filtration

• Magnetic attraction

What are the steps required to recover chalk from a mixture of sugar and chalk?

(i)            Filter the mixture to obtain the residue

(ii)           Filter the mixture to obtain the filtrate

(iii)          Distill the mixture

(iv)          Pour water into the mixture

(v)           Stir the mixture

(vi)          Evaporate the mixture to dryness

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How do you obtain the solute from sea water?

• Evaporation to dryness

• Filtration

• Paper chromatography

• Simple distillation

How do you obtain the solvent from sea water?

• Evaporation to dryness

• Filtration

• Paper chromatography

• Simple distillation

When should we use simple distillation to separate a mixture?

• When we want to obtain the solute that has been dissolved in a solvent

• When we want to obtain the solvent that has dissolved the solute

• When we want to separate two liquids with close boiling points

• When we want to separate two solids with close melting points

What is the main property of substances in a mixture that allows paper chromatography to work?

• Substances in the mixture must have different colours

• Substances in the mixture must dissolve to different extents in a solvent

• Substances in the mixture have different boiling points

• Substances in the mixture have different melting points

Based on this paper chromatography result, which substance is the most soluble in the solvent?

• Yellow substance

• Green substance

• Red substance

• None of the substances are soluble

Why is there a need to fill water in from the bottom of the condenser?

• To ensure that the weight of the condenser is eveny distributed

• To ensure efficient cooling as the condenser will be completely filled

• To ensure a gradual decrease in temperature so that the condenser won't break

• To ensure that the end of the condenser is cooler so that all the water vapour condenses