Practise Edexcel IGCSE Chemistry investigation planning by choosing apparatus, extending methods and explaining safe experimental choices.
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
State how you should extend the investigation to see if your deduction is correct.
A student uses this apparatus to investigate the rate of reaction between marble chips and dilute hydrochloric acid.
The equation for the reaction is
During the reaction the mass of the contents of the flask decreases.
State the purpose of the cotton wool.
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
Name a suitable piece of apparatus to measure the volume of sulfuric acid.