GCSE Chemistry: Test Your Knowledge of Quantitative Analysis

Chemistry Quiz - Analysing Substances - Quantitative (Questions)

Measure how much of a substance is in a sample using titrations and instruments. This GCSE Chemistry quiz helps you calculate concentration, interpret graphs, and compare accuracy.

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Fascinating Fact:

Instrumental methods, like flame emission spectroscopy, can measure concentration using light intensity. A calibration curve is made from standards, then the unknown is read from the graph.

In GCSE Chemistry, quantitative analysis focuses on measuring amounts, not just identifying substances. You practise using data from experiments to calculate concentration, judge reliability, and decide which method gives the most useful results.

Key Terms

Concentration: How much solute is dissolved in a certain volume of solution, often measured in g/dm³ or mol/dm³.
Titration: A method where one solution is added to another until the reaction is complete, so you can calculate an unknown concentration.
Endpoint: The point in a test where a visible change happens, such as an indicator colour change showing the reaction has just finished.

Frequently Asked Questions (Click to see answers)

What is quantitative analysis in GCSE Chemistry?

Quantitative analysis in GCSE Chemistry is measuring how much of a substance is present, such as the concentration of a solution, using calculations and experimental results.

How do you calculate concentration from a titration?

To calculate concentration from a titration, you use the volumes and known concentration to find moles, apply the balanced equation, then divide moles by volume to get the unknown concentration.

Why do scientists repeat measurements in chemistry?

Scientists repeat measurements to reduce random error and spot anomalies. Repeats make results more reliable and help you calculate a better average value.

Try These Related Quizzes

What is the relative formula mass of copper sulfate CuSO₄?

[ ]	160 amu
[ ]	96 amu
[ ]	128 amu
[ ]	144 amu

What is the relative formula mass of MgF₂?

[ ]	60 amu
[ ]	62 amu
[ ]	43 amu
[ ]	64 amu

What % mass of magnesium oxide is magnesium?

[ ]	60%
[ ]	40%
[ ]	30%
[ ]	70%

What is the % mass of hydrogen in methane CH₄?

[ ]	20%
[ ]	25%
[ ]	75%
[ ]	12.5%

Calcium reacts with oxygen as shown by this reaction 2Ca + O₂ → 2CaO. What mass of oxygen will react with 60g of calcium?

[ ]	12g
[ ]	24g
[ ]	6g
[ ]	14g

Sodium hydroxide reacts with chlorine to make bleach as shown by this reaction. 2NaOH + Cl₂ → NaOCl + NaCl + H₂O. If we have a solution containing 100g of sodium hydroxide, how much chlorine gas should we pass through the solution to make bleach?

[ ]	28.65g
[ ]	82.45g
[ ]	88.75g
[ ]	86.57g

If 9g of aluminium reacts with 35.5g of chlorine, what is the empirical formula of the compound formed?

[ ]	AlCl
[ ]	AlCl₂
[ ]	AlCl₃
[ ]	Al₃Cl

A compound contains 13.5g of calcium, 10.8g of oxygen and 0.675g of hydrogen. What is its empirical formula?

[ ]	CaOH
[ ]	CaOH₂
[ ]	CaO₂H
[ ]	Ca(OH)₂

A reaction that could theoretically produce 200g of product only produces 140g. What is its % yield?

[ ]	70%
[ ]	14.2%
[ ]	142%
[ ]	7%

10.

Ammonium nitrate NH₄NO₃ is used as a fertiliser. What is the % mass of nitrogen in it?

[ ]	21%
[ ]	37%
[ ]	17.5%
[ ]	35%

Chemistry Quiz - Analysing Substances - Quantitative (Answers)

What is the relative formula mass of copper sulfate CuSO₄?

[x]	160 amu
[ ]	96 amu
[ ]	128 amu
[ ]	144 amu

amu = atomic mass units

What is the relative formula mass of MgF₂?

[ ]	60 amu
[x]	62 amu
[ ]	43 amu
[ ]	64 amu

Mg = 24 amu, F = 19 amu, remember that there are 2 F atoms in the molecule of MgF₂

What % mass of magnesium oxide is magnesium?

[x]	60%
[ ]	40%
[ ]	30%
[ ]	70%

First you work out the relative formula mass of magnesium oxide (MgO) then divide the relative atomic mass of magnesium by the relative formula mass and multiply by 100 for the percentage

What is the % mass of hydrogen in methane CH₄?

[ ]	20%
[x]	25%
[ ]	75%
[ ]	12.5%

Use the same method as for the previous question

Calcium reacts with oxygen as shown by this reaction 2Ca + O₂ → 2CaO. What mass of oxygen will react with 60g of calcium?

[ ]	12g
[x]	24g
[ ]	6g
[ ]	14g

From the equation, you find that they react in a ratio of 2 moles to 1 mole. 60g of calcium is 1.5 moles so you will need 0.75 moles of oxygen molecules

[ ]	28.65g
[ ]	82.45g
[x]	88.75g
[ ]	86.57g

Ratio of sodium hydroxide to chlorine is 2 moles to1 mole

If 9g of aluminium reacts with 35.5g of chlorine, what is the empirical formula of the compound formed?

[ ]	AlCl
[ ]	AlCl₂
[x]	AlCl₃
[ ]	Al₃Cl

Use moles! One third of a mole of aluminium atoms react with 1 mole of chlorine atoms therefore there are three times as many chlorine atoms involved. Remember, the mole is nothing more complicated than a measure of the number of particles in a reaction

A compound contains 13.5g of calcium, 10.8g of oxygen and 0.675g of hydrogen. What is its empirical formula?

[ ]	CaOH
[ ]	CaOH₂
[ ]	CaO₂H
[x]	Ca(OH)₂

It's those moles again ...