Year 7 Solutions

All mixtures are solutions.

• False

• True

Air is a mixture composed of about 78% nitrogen, 21% oxygen less than 1% argon and many trace gases. Identify the solvent in air.

• argon

• oxygen

• nitrogen

• trace gases

Carbonated water is a mixture of carbon dioxide gas and water. Identify the solute.

• water

• carbon dioxide

• there is no solute in carbonated water

Imagine you mix sugar in water. Which of the following is not correct?

• a homogeneous mixture is obtained

• a solution is formed

• sugar is the solute

• water is the solute

A substance that is unable to dissolve in a certain substance is

• soluble

• insoluble

• solute

• solvent

Means able to dissolve in a certain solvent

• soluble

• insoluble

• solute

• solvent

What happens if you add more water to a solution?

• the concentration decreases

• the concentration increases

• The concentration stays the same

Means able to dissolve in a certain solvent

• soluble

• insoluble

• solute

• solvent

What happens if you add more water to a solution?

• The concentration decreases

• The concentration increases

• The concentration stays the same

Solutions with high concentrations of solutes are...

• dilute

• concentrated