
StudySquare
Rates and equilibrium for OCR GCSE Chemistry







This page covers the following topics:
1. Rate of reaction
The rate of a chemical reaction can be increased by increasing temperature, increasing reactant concentration, increasing the surface area of solid reactants or the use of catalysts. There are a number of ways we can determine the rate of reaction experimentally.

1
What is a catalyst?
A compound that increases the rate of reaction without being chemically altered or used up at the end of the reaction.
2
What does the gradient represent on a graph of total mass of product produced vs time from start of reaction?
rate of reaction
3
12 g of reactant is used up after 45 seconds, what is the rate of reaction?
0.27 g sโปยน
4
What are the units of the rate of reaction when COโ gas is released over 30 seconds?
cmยณ sโปยน
5
HCl was added to sodium thiosulfate solution in a conical flask, the resulting solution going from transparent to opaque after 64 seconds. What is the rate of the reaction?
0.016 sโปยน
End of page