Surface area

• large piece of solid -> smaller pieces = surface area increases
• surface area increases rate: more particles available to be collided with, more likely for a collision + successful collisions to occur in a certain time -> faster rate
• increased surface area = particle size decreased
• small surface area = only outer edges can be collided with, so less collisions -> slower rate

  
• large surface area: more surfaces to be collided with + less shielded particles = quicker rate

  
• the more particles available -> more likely there is to be a collision -> more successful collisions occur in a certain time -> rate increases in a certain time
• to increase rate of reaction for an experiment that has chips -> increase surface area