* ** *** Recognise differences in rate of reaction Choose between explanations to explain differences in reaction rate Independently write and use particle diagrams to explain reaction rate

Warm Cold

Weak strong

Calcium carbonate (marble)

Large Small

Calcium carbonate (marble)

42s would be 0 hours 0 mins 42 seconds or 00:00:42

Lab report You have to write a lab report for head office explaining how the rate of reaction can be changed by chemical change factors. You are going to tell them about Temperature Concentration Particle size For each of the headings you need to say: What you found out – e.g. the hotter the acid… the stronger the acid… the smaller the particle… A graph of your results You need to draw a particle diagram. Use colour if you can to show the different particles At least a sentence explaining what is happening

Key words concentration particle size temperature collisions energy movement molecules more less warm cold acid large small surface area contact touch faster slower fast slow between more likely less likely ratio volume