Sec 3 G2/3 Separation Techniques

Which of the following mixtures can be separated using a magnet?

• Aluminium and rubber

• Copper and styrofoam

• Iron and sulfur

• Steel and nickel

Some students are conducting a paper chromatography experiment. Which physical property allows them to separate the components of a mixture?

• Difference in boiling point

• Difference in colour

• Difference in density

• Difference in solubility in the same solvent

Take a look at this chromatogram with spots of five different inks. Can you figure out how many different dyes were used to make the five inks?

• 3

• 4

• 5

• 12

Identify the dye which is the most soluble in this solvent.

• Substance 1

• Substance 2

• Substance 3

• Substance 4

Which of the following processes is not involved in the treatment of wastewater to produce NEWater in Singapore?

• Microfiltration

• Reverse osmosis

• Simple distillation

• Ultraviolet disinfection

Why do we have to draw the start line using a pencil?

Scarlett and her sister used the apparatus shown to separate a mixture of sand and water that they collected from the beach. What is the name of the separation technique used?

Name apparatus A

Name apparatus B.

This setup is used to obtain pure water from a sample of seawater. Name the separation technique involved.