Edexcel IGCSE Chemistry 3.12 catalyst definition
Practise catalyst-definition questions by explaining unchanged mass, faster rate and why yield is not increased in MnO2 practicals.
- Syllabus
- First assessment 2019
- Course
- Chemistry 4CH1
Exam points
- State that a catalyst speeds up a reaction without increasing the final yield.
- Describe filtering, drying and reweighing MnO2 to show the catalyst is unchanged.
- Distinguish a catalyst from a reactant using the same mass left at the end.
3.12 Catalyst definition question 1
[Maximum number: 1]
Hydrogen peroxide solution decomposes slowly at room temperature to form water and oxygen.
The equation for the reaction is
2H2O2→2H2O+O2
A catalyst increases the rate of this reaction.
State one other property of a catalyst.
Any one from:
- a catalyst is chemically unchanged at the end of the reaction
- provides an alternative route with lower activation energy
- not used up in the reaction
Manual note:
- ROW_BOUNDARY_REPAIR_REQUIRED: official 5(b) is merged into the imported 5(a) prompt but has no separate database row. The 5(a) row has been restored to 5(a) only; create a separate 5(b) row from the official paper/markscheme before using that sub-question.
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