Edexcel IGCSE Chemistry 2.12 carbon dioxide formation
Practise carbon-dioxide formation questions by identifying thermal decomposition, carbonate reactants and CO2 test evidence.
- Syllabus
- First assessment 2019
- Course
- Chemistry 4CH1
Exam points
- Explain thermal decomposition as a compound breaking down when heated.
- Identify CO2 as the gas from heated calcium carbonate or copper(II) carbonate.
- Apply carbonate evidence such as limewater turning cloudy or colour changes on heating.
2.12 Hydrocarbon combustion practical 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 the name given to this type of reaction.
[ 1 ]
Question (b)
(b)
The table shows some of the results for the student's investigation.
[ 2 ]
Question (i)
(i)
State the colour change that occurs for copper(II) carbonate.
from……to……
[ 2 ]
Question (c)
(c)
There is a relationship between the position of a metal in the reactivity series and how easily the metal carbonate reacts when heated.
Use the student's results and your own knowledge to deduce this relationship.
[ 2 ]
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