Evaporation & Filtration

Table salt dissolves readily in water to form salt water. Which word best describes table salt?

• Solution

• Solute

• Solvent

• Suspension

Tags

Solutions, Suspensions, Separation Techniques

Mustafa and Grace are conducting a science experiment in their classroom. They decide to add a piece of chalk to a glass of water. What is produced as a result of this?

• Suspension

• Solution

• Solvent

• Solute

Tags

Solutions, Suspensions, Separation Techniques

Which TWO statements are true about solutions and suspensions?

• Both solutions and suspensions can be separated by filtration.

• Both solutions and suspensions are mixtures.

• Solutions are colourless but suspensions are coloured.

• Solutions allow light to pass through but not suspensions.

Tags

Solutions, Suspensions, Separation Techniques

Some students are in a science lab, preparing to carry out a filtration experiment. Which piece of equipment is NOT required for their experiment?

• Bunsen burner

• Conical flask

• Filter paper

• Filter paper

Tags

Solutions, Suspensions, Separation Techniques

What TWO precautions must be taken when carrying out filtration?

• Carry out the filtration process at room temperature only.

• Fold the filter paper correctly to avoid leakage.

• Only use a glass funnel as plastic funnels are bad for the Earth.

• Pour the mixture slowly over the filter paper to avoid spillage.

Tags

Solutions, Suspensions, Separation Techniques

Which mixture CANNOT be separated using filtration?

• Flour and water

• Iron filings and water

• Sugar and water

• Wood chips and water

Tags

Solutions, Suspensions, Separation Techniques

A mixture of sand and water was pass through filter paper. Which statement is correct?

• The sand is the filtrate and the water is the residue.

• The sand is the residue and the water is the filtrate.

• The sand and water are both filtrates.

• The sand and water are both residues.

Tags

Solutions, Suspensions, Separation Techniques

To speed up the process shown, a student uses a glass rod to stir the mixture while it is in the funnel. Is this a good idea? Why?

• No, evaporation will happen.

• No, the paper might tear.

• Yes, there is increased pressure by the glass rod.

• Yes, the stirring motion creates a whirlpool.

A sample of sea water was heated using the apparatus in the diagram. What will be observed after a long period of heating?

• Pure water will be left behind in the evaporating dish.

• The evaporating dish will be empty.

• The water will be boiled off leaving only salt in the evaporating dish.

• There will be no change.

Tags

Solutions, Suspensions, Separation Techniques

When carrying out the process shown, what are the TWO safety precautions that must be followed?

• Ensure long hair is tied up.

• Fill the evaporating dish right to the top.

• Use a safety flame only.

• Wear safety goggles as products may spit.