Chemistry · Grades 9–12
Reaction rates and catalysts · Revision sheet
Separate a rate change from a change in equilibrium or reaction enthalpy.
Learn the idea
Rate
A rate measures concentration or amount change per time under a specified definition.
Collisions
Suitable encounters and sufficient energy help explain rates in an introductory model.
Catalyst
A catalyst provides an alternative pathway with a lower activation barrier and is regenerated overall.
Equilibrium
A catalyst speeds approach to equilibrium without changing the equilibrium constant at fixed temperature.
Explain without looking
- Why should a rate law not usually be read directly from overall equation coefficients?
- Which is a valid description of a catalyst after a complete catalytic cycle?
Further reading and review references
These are reference links, not copied exercises, institutional endorsement or proof of independent review.
Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.