Rates of Reaction

Evie Papanicola
Flashcards by , created over 5 years ago

Cambridge IGCSE Chemistry Flashcards on Rates of Reaction, created by Evie Papanicola on 10/08/2013.

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Evie Papanicola
Created by Evie Papanicola over 5 years ago
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Question Answer
What is the Reaction Time? The time taken between a reaction starting and stopping.
What is a Reactant? A substance that takes part in a chemical reaction. Reactants are written on the left hand side of a chemical equation.
What is Excess Reactant? A reactant that is not all used up in a reaction that uses all of another reactant is said to be in excess.
What is Limiting Reactant? Reactant that is completely used up in a reaction and so determines how much product can be made.
What is the rate of reaction controlled by? The number of effective collisions occurring per second
Explain what increasing the concentration of reactants does. More particles in the same volume will bump into each other more often.
Explain what increasing the temperature does. The particles move more quickly, which means they collide more often. They also collide with more energy.
Explain what increasing the surface area does. It allows more surface to come into contact with the other reactants.
How does a catalyst help speed up a reaction? It provides an alternative route for the reaction to occur by.
Rate Amount of change in the dependent variable/time measured for
What is a catalyst? A catalyst increases the speed of a reaction, without being chemically changed or used up in the reaction.