Measuring the amounts of chemicals in solutions test questions - OCR 21st Century - GCSE Combined Science Revision

1

Which technique is an example of quantitative analysis?

Limewater test

Titration

Flame tests

2

What ions form when any acid dissolves in water?

Cl^-

OH^-

H⁺

3

What salt is formed when hydrochloric acid reacts with calcium hydroxide?

Sodium chloride

Calcium chloride

Calcium sulfate

4

What is the formula of calcium hydroxide?

Ca(OH)₂

CaO

CaOH

5

What salt is formed when potassium hydroxide reacts with nitric acid?

KNO₃

NaNO₃

KCl

6

What are the units of concentration if it is calculated by mass/volume?

mol/dm³

g/dm³

dm³/g

7

How do you change concentration in mass/volume to moles/volume?

Divide by 1,000

Multiply by relative formula mass

Divide by relative formula mass

8

What is the concentration of 1 g of NaOH dissolved in 100 cm3 of water?

1 g/dm³

10 g/dm³

0.1 g/dm³

9

What is the concentration of 2 mol of NaOH dissolved in 4 dm³ of water?

0.5 mol/dm³

2 mol/dm³

8 mol/dm³

10

What is the concentration of 0.2 mol of NaOH dissolved in 500 cm³ of water?

0.04 mol/dm³

0.1 mol/dm³

0.4 mol/dm³