Compound, mixtures, elements

When salt completely dissolves in water, we say that salt is _______ in water.

• Soluble

• Insoluble

• Solvent

• Solute

Copper (II) sulphate (a blue solid), is placed into water to form a solution. Copper (II) sulphate is also known as a(n) ________ in this simple experiment.

• solvent

• solute

• element

• suspension

Which of the following best categorises apple juice?

• mixture

• element

• compound

• mixture of compound

Which of the following is the lightest?

• hydrogen

• argon

• helium

• oxygen

Common gases in our air includes carbon dioxide, water vapour, nitrogen, oxygen. Which of the following is true?

• our air contains elements only

• our air contains compounds only

• our air is a mixture of compounds and elements

• air is a solution

Ozone (made of 3 oxygen molecules) and Nitrogen gas (made of 2 nitrogen molecules) are both considered as?

• Element

• Compound

• Solute

• Mixture

Which of the following is a mixture? (please select more than 1 option if necessary)

• water

• salt water

• cold water

• iced lemon tea

Which of the following can increase the rate of dissolving? (please select more than 1 option if necessary)

• increasing the temperature of the solute

• increase the rate of stirring the mixture

• shining light into the mixture

• placing the mixture in a fridge

Which of the following is true for water? (please select more than 1 option if necessary)

• It is a mixture

• It can be seperated easily

• Each water molecule comprimises of a random amount of hydrogen and oxygen

• It has different physical properties as compared to hydrogen and oxygen

Icebergs float on water because

• Ice is less dense than water

• Ice is more dense than water

• Ice and water are both mixtures

• Ice and water are both elements