Rates of chemical reactions, Chemistry paper 2 Flashcards
What is meant by the rate of a reaction?
It is a measure of how quickly a reactant is used up or a product is formed.
What is the collision theory?
The theory that chemical reactions require reactant particles to collide with enough energy to react.
What is meant by activation energy?
The minimum energy that colliding particles must have for a reaction to occur.
Define concentration
A measure of how much of a substance is dissolved in a solution.
What is meant by surface area to volume ratio?
It is a measure of the exposed area of a substance compared to the volume of the substance.
What is a catalyst and what does it do?
It is a substance that speeds up the rate of reaction without changing the products or being used up.
Define turbidity?
How cloudy a liquid appears due to tiny suspended particles.
What is a reversible reaction?
A chemical reaction that can go both ways represented by the 2 arrows symbol.
What is meant by equillibrium?
A reaction in a closed system in which the forward reaction has the same rate as the reverse reaction.
What is le chatiliers principle?
An idea that explains how the position of equillibrium can be changed by changing pressure,concentration or temperature.
What is meant by a closed system?
A reaction in which nothing is allowed to enter or leave the reaction container.
What is the equation used for calculating the mean rate of reaction.
quantity of reactant used divided by time taken.
