← Chemistry syllabus

EnglandChemistry

C2: Chemical Change (C2.3 Rates of reaction)

4 dot points across 4 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

What controls how fast a reaction goes, and how do we explain the effect of each factor?

Collision theory, the effect of concentration, pressure, surface area, temperature and catalysts on rate, the Maxwell-Boltzmann distribution, activation energy and how catalysts work.
An Eduqas A-Level Chemistry C2.3 answer on collision theory, the factors affecting reaction rate, the Maxwell-Boltzmann distribution, activation energy and the action of catalysts.
11 min answer →

What does it mean for a reaction to reach equilibrium, and how do acids and bases react?

Reversible reactions and dynamic equilibrium, Le Chatelier's principle, the Bronsted-Lowry theory of acids and bases, strong and weak acids, and the reactions of acids.
An Eduqas A-Level Chemistry C2.1 answer on dynamic equilibrium, Le Chatelier's principle, the Bronsted-Lowry theory, strong and weak acids, and the typical reactions of acids.
11 min answer →

How is the chemistry of reactions used to make industrial processes greener and more sustainable?

Green chemistry and sustainability, atom economy and percentage yield as measures of efficiency, the use of catalysts and renewable feedstocks, and reducing the environmental impact of chemical processes.
An Eduqas A-Level Chemistry C2.4 answer on green chemistry and sustainability, atom economy and yield as efficiency measures, the role of catalysts and feedstocks, and reducing environmental impact.
10 min answer →

How do we measure and calculate the energy changes that accompany chemical reactions?

Enthalpy changes, exothermic and endothermic reactions, standard enthalpy changes of reaction, formation and combustion, calorimetry, Hess's law and mean bond enthalpies.
An Eduqas A-Level Chemistry C2.2 answer on enthalpy changes, standard enthalpies of reaction, formation and combustion, calorimetry, Hess's law and mean bond enthalpies.
12 min answer →