Rate of reaction
The rate of a reaction is a measure of how quickly a A substance that reacts together with another substance to form products during a chemical reaction. is used up, or a A substance formed in a chemical reaction. is formed. Rate of reaction is affected by factors such as The concentration of a solution tells us how much of a substance is dissolved in water. The higher the concentration, the more particles of the substance are present., Force exerted over an area. The greater the pressure, the greater the force exerted over the same area., How warm or cold something is. and The total area of exposed material available for a chemical reaction (or absorption) to take place. to The volume of a three-dimensional shape is a measure of the amount of space or capacity it occupies, eg an average can of fizzy drink has a volume of 330 ml. ratio of a solid reactant.
A model of colliding A general term for a small piece of matter. For example, protons, neutrons, electrons, atoms, ions or molecules. helps to explain why different factors affect rate of reaction.
Collision theory
For a chemical reaction to happen:
- reactant particles must collide with each other
- the particles must have enough energy for them to react
A collision that produces a reaction is called a A collision between reactant particles that has enough energy for a reaction to happen.. The The minimum amount of energy that colliding particles must have for them to react. is the minimum amount of energy needed for a collision to be successful. This is different for different reactions.
Image caption, Two pairs of particles move towards each other
1 of 3