rates of reactions revision Flashcards
How can the rate of a reaction be increased by increasing temperature?
When a substance is heated up its particles move about faster as they have more kinetic energy, causing more successful collisions.
How can the rate of reaction be increased by increasing concentration?
The concentration of a solution is a measure of the number of particles of a solute (e.g. salt - sodium chloride) in a given volume of solvent (e.g. water). The more particles in a certain volume of solvent causes more successful collisions.
How can the rate of reaction be increased by decreasing particle size?
The smaller the particle size the more surface area there is causing more successful collisions as there is much greater contact with the other reactant.
How can the rate of reaction be increased by the use of a catalyst?
Catalysts can be used to increase the rate of a reaction.
What is a catalyst?
A catalyst is a substance that speeds up chemical reaction but can be recovered chemically unchanged at the end of the reaction.
What is the collision theory?
For a reaction to occur the reactant particles must come into contact, or collide with each other.
The more collisions that occur, in a given time, the faster the reaction.
What is the formula to calculate rate of reaction?
change in quantity
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change in time
Can be found on the first page of the data booklet.
