Free Experimental design questions for IGCSE Chemistry (0620), part of Experimental techniques & analysis. Each question has the answer and the marking points an examiner would look for.
Generate a full Experimental Design worksheet →All Experimental techniques & analysis questionsA student needs to measure exactly 25.0 cm³ of an acid, add a varying volume of alkali from a scale, and collect the gas produced.
Which apparatus is used for each?
| 25.0 cm³ of acid | varying volume of alkali | collect gas | |
|---|---|---|---|
| A | volumetric pipette | measuring cylinder | beaker |
| B | volumetric pipette | burette | gas syringe |
| C | burette | volumetric pipette | gas syringe |
| D | measuring cylinder | burette | balance |
Answer: B
What is the best apparatus to measure the temperature change of a reaction?
Answer: A
Which statement describes solute?
Answer: A
Identify suitable apparatus for accurate measurement.
State which apparatus measures 25.0 cm³ of a solution most accurately: beaker, measuring cylinder or volumetric pipette.
Explain why a burette is used in a titration rather than a measuring cylinder.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | volumetric pipette volumetric pipette B1 | 1 |
| (b) | can add small, measured amounts accurately measures variable volumes accurately to 0.05 cm³ / can add drop by drop B1 | 1 |
A student wants to find the melting point of a solid.
Suggest suitable apparatus.
State how the melting point shows if the solid is pure.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | capillary tube, thermometer, water/oil bath capillary tube with sample B1 thermometer in a heated water/oil bath B1 | 2 |
| (b) | sharp, fixed melting point a pure substance melts at a sharp, fixed temperature (impurities lower it/give a range) B1 | 1 |
This question is about choosing apparatus and methods.
Name the most suitable apparatus to measure each of: exactly 25.0 cm³ of a solution; a volume of gas; the time for a reaction.
A student measures 10 cm³ of acid with a 100 cm³ measuring cylinder. Explain why this is not accurate and suggest a better choice.
Describe how to measure the rate of the reaction between magnesium ribbon and hydrochloric acid by measuring gas volume.
Explain why the student should repeat each experiment.
A gas is collected over water. Suggest a gas for which this method is unsuitable, and explain.
| Part | Answer and marking points | Marks |
|---|---|---|
| (a) | volumetric pipette; gas syringe; stopwatch (volumetric) pipette B1 gas syringe B1 stopwatch / timer B1 | 3 |
| (b) | large scale divisions, large percentage error; use 10 cm³ measuring cylinder / pipette / burette each division is large compared with 10 cm³ so the percentage error is large B1 use a 10 cm³ measuring cylinder / burette / pipette B1 | 2 |
| (c) | gas syringe connected to flask; add Mg, start timer; record volume at intervals; same mass/length of Mg and volume of acid connect a conical flask to a gas syringe with a bung and delivery tube B1 add the magnesium, replace the bung and start the timer B1 record the volume of gas at regular time intervals B1 control variables: same length of magnesium, same volume and concentration of acid, same temperature B1 | 4 |
| (d) | to check the results are repeatable / identify anomalies to identify anomalous results and calculate a mean (check repeatability) B1 | 1 |
| (e) | ammonia / hydrogen chloride; very soluble in water ammonia / hydrogen chloride / sulfur dioxide B1 it is very soluble in water B1 | 2 |
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Meet Riyaz →Original Cambridge-style practice questions written for mentorriyaz.in. These are not Cambridge past paper questions, and this site is not affiliated with or endorsed by Cambridge University Press & Assessment. Updated 2026-11-04. Paper generator · mentorriyaz.in