Water, solutions and solubility

Question 1 of 10

The number of moles of solute in 500 cm³ of a 0.5 mol/dm³ solution is ___ mol.

Question 2 of 10

An efflorescent substance

Question 3 of 10

Water is described as a universal solvent because

Question 4 of 10

The number of moles of solute in 100 cm³ of a 1 mol/dm³ solution is ___ mol.

Question 5 of 10

Hard water is good for bones and teeth because it contains calcium.

Question 6 of 10

Distinguish between temporary and permanent hardness of water. For each, name one cause and one method of removal, with an equation where possible.

Question 7 of 10

A solution is a homogeneous mixture.

Question 8 of 10

Temporary hardness of water is caused by dissolved

Question 9 of 10

0.25 mol of solute is dissolved to make 100 cm³ of solution. What is its concentration?

Question 10 of 10

Alum (aluminium sulphate) is used in water treatment to