Edexcel IGCSE Chemistry Experimental Skills
Practise Edexcel IGCSE Chemistry experimental skills by improving methods, choosing apparatus, increasing accuracy and testing deductions.
- Syllabus
- Issue 3 (2024)
- Course
- Chemistry 4CH1
Covered syllabus points
5 Experimental skills question 1
A student uses this apparatus to investigate the effect of heat on different solid metal carbonates.
This is the student's method.
- use a spatula to put some metal carbonate in the boiling tube
- fit the delivery tube into position
- pour some limewater into the test tube
- start a timer and immediately begin to heat the metal carbonate
- record the time when a change first occurs in the limewater
The student repeats the method using different metal carbonates.
When a metal carbonate is heated a reaction sometimes occurs.
The equation for the reaction is
metal carbonate → metal oxide + carbon dioxide
Question (a)
(a)
State two variables that the student should control in this investigation.
1
2
[ 2 ]
Question (b)
(b)
Suggest why bubbles appear in the limewater immediately after heating has started but before there is any change to the metal carbonate.
[ 1 ]
Question (c)
(c)
State how you should extend the investigation to see if your deduction is correct.
[ 1 ]
5 Experimental skills question 2
A student uses this apparatus to investigate the rate of reaction between dilute sulfuric acid and an excess of small pieces of zinc.
This is the student's method.
Step 1 use of dilute sulfuric acid
Step 2 add approximately 5 g of small zinc pieces to the sulfuric acid
Step 3 quickly connect the gas syringe
Step 4 record the reading on the gas syringe every 30 seconds until the reaction stops
Question (a)
(a)
Name a suitable piece of apparatus to measure the volume of sulfuric acid.
[ 1 ]
Question (b)
(b)
Give a reason why the mass of zinc pieces does not need to be measured accurately.
[ 1 ]
Question (c)
(c)
Give a reason why the student quickly connects the gas syringe in step 3.
[ 1 ]
Question (d)
(d)
State how the student would know when the reaction stops.
[ 1 ]
5 Experimental skills question 3
A student investigates the effect of temperature on the rate of reaction between two solutions, A and B . When the reaction occurs, the mixture turns from colourless to blue.
This is the student's method.
- pour of solution A into a conical flask
- add solution B and measure the temperature of the mixture
- record the time taken for the mixture to turn blue
The student repeats this method at different temperatures.
Question (a)
(a)
Give two variables that the student needs to keep constant in this investigation.
1
2
[ 2 ]
Question (b)
(b)
The table shows the student's results.
[ 2 ]
Question (i)
(i)
Draw a circle around the anomalous result.
[ 1 ]
Question (ii)
(ii)
Give a reason for the anomalous result.
[ 1 ]
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