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Edexcel GCSE Chemistry Rates and equilibrium

Rates and equilibrium

This page covers the following topics:

At equilibrium, the concentrations of the products and reactants will be constant but not equal. Kc is the equilibrium constant, expressing these equilibrium concentrations combined.

aA + bB β‡Œ cC + dD

Calculating Kc

Equilibrium constants can be explained in terms of partial pressures of gases, Kp. It can be expressed from the equation for a reversible reaction.

aA + bB β‡Œ cC + dD

Calculating Kp

Rate equations describe the rate of reaction in terms of concentration and order of the reaction with respect to each reactant. The rate constant k varies depending on the reaction.

Rate equations

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.

Rate of reaction

The rate constant for a reaction various with temperature and activation energy. This is shown by the Arrhenius equation.

The rate constant

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What does the gradient represent on a graph of total mass of product produced vs time from start of reaction?

Edexcel GCSE Chemistry Rates and equilibrium What does the gradient represent on a graph of total mass of product produced vs time from start of reaction?
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12 g of reactant is used up after 45 seconds, what is the rate of reaction?

Edexcel GCSE Chemistry Rates and equilibrium 12 g of reactant is used up after 45 seconds, what is the rate of reaction?
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