PSLE Science Chemistry Topics 2

Question 1

Which method is best for separating salt from a saltwater solution?

Accepted Answer

Evaporation

Answer

Filtration

Answer

Magnetic separation

Answer

Sieving

Question 2

What is a solution?

Accepted Answer

A uniform mixture where one substance dissolves completely in another

Answer

A mixture where solid particles are visible at the bottom

Answer

A mixture of two liquids that do not mix

Answer

Any mixture of two or more substances

Question 3

Which separation method would you use to remove sand from a sand-and-water mixture?

Accepted Answer

Filtration

Answer

Evaporation

Answer

Magnetic separation

Answer

Distillation

Question 4

Which mixture can be separated effectively using a magnet?

Accepted Answer

Iron filings and sand

Answer

Salt and sugar

Answer

Sand and salt

Answer

Rice and water

Question 5

In a saltwater solution, what is the solvent?

Accepted Answer

Water

Answer

Salt

Answer

The solution itself

Answer

Salt and water equally

Question 6

What happens when you mix oil and water in a container?

Accepted Answer

Oil floats on top of water because oil is less dense and they do not mix

Answer

Oil dissolves completely in water to form a clear solution

Answer

Water floats on top of oil because water is less dense

Answer

They mix evenly to form a uniform solution

Question 7

Which of the following substances is NOT soluble in water?

Accepted Answer

Sand

Answer

Sugar

Answer

Salt

Answer

Baking soda