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GCSE Chemistry 2.4 Rates And Energy > End Of Unit Questions > Flashcards

Flashcards in End Of Unit Questions Deck (8)
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How can you find the rate of reaction from a graph of mass of product against time?

From the gradient of the graph


What is meant by the activation energy of a reaction?

The minimum energy that particles must have for collisions to produce a reaction


Name 2 types of reactions that are exothermic

Combustion, oxidisation, neutralisation


Why must calcium carbonate be heated continuously to convert it into calcium oxide and carbon dioxide?

Thermal decomposition is an endothermic reaction


Nitrogen and oxygen react together to produce nitrogen oxide, what changes in conditions would increase the rate of this reaction?

High temp, high pressure, catalyst


Explain in terms of particles why increasing the concentration of a reactant increases the rate of reaction

Particles are closer together (more particles in the same volume) so collisions are more frequent


Explain why increasing the temp increases the rate of a reaction

Particles collide more frequently and with more energy so more collisions have the activation energy


Pieces of zinc react with dilute hydrochloric acid to make zinc chloride and hydrogen gas. In what ways could you increase the rate of reaction between zinc and hydrochloric acid?

Increase concentration of acid, increase temp, use powdered zinc, use a catalyst