Chemistry

Question 1

1A suspension allows light to pass through clearly.

Easy

A. True B. False

Question 2

2The number of moles of solute in 100 cm³ of a 1 mol/dm³ solution is ___ mol.

Easy

Your answer (fill in the blank)

Question 3

3Solubility is usually expressed as

Easy

A. litres of solvent B. moles per gram C. density of solution D. grams of solute per 100 g of solvent at a given temperature

Question 4

40.1 mol of solute is dissolved to make 500 cm³ of solution. What is its concentration?

Medium

A. 0.05 mol/dm³ B. 0.02 mol/dm³ C. 0.2 mol/dm³ D. 0.0002 mol/dm³

Question 5

50.25 mol of solute is dissolved to make 200 cm³ of solution. What is its concentration?

Medium

A. 0.0013 mol/dm³ B. 0.05 mol/dm³ C. 1.25 mol/dm³ D. 0.125 mol/dm³

Question 6

6Chlorine is added during water treatment to

Easy

A. add taste B. remove colour only C. kill bacteria D. remove hardness

Question 7

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

Medium

A. 5 mol/dm³ B. 0.05 mol/dm³ C. 0.005 mol/dm³ D. 0.5 mol/dm³

Question 8

8A saturated solution is one that

Easy

A. has more solvent than solute B. cannot dissolve any more solute at that temperature C. contains no solute D. is boiling

Question 9

9Hard water forms scum with soap because

Medium

A. it contains chlorine B. Ca²⁺ and Mg²⁺ react with soap to form an insoluble precipitate C. it is too cold D. it is too acidic

Question 10

10Water is described as a universal solvent because

Easy

A. it dissolves everything B. it dissolves a very wide range of substances C. it is found everywhere D. it is colourless