Factors Controlling the Speeds of Chemical Reactions and the Collision Theory

his page describes the factors controlling the speeds of chemical reactions and the collision theory behind it discussed. The factors affecting the speed of reaction are also presented using particle models to give a theoretical basis to the rules on the effects of concentration, pressure, temperature, solid reactant particle size (surface area), stirring, catalysts and light. Methods of how to collect data are also described and graphical treatment of the observations and how to draw conclusions. How do we graphically interpret tables of results and what graphs are useful and why. How to we calculate the speed of a reaction?

Revision KS4 Science GCSE/IGCSE/O level Chemistry Information Study Notes for revising for AQA GCSE Science, Edexcel 360Science/IGCSE Chemistry & OCR 21stC Science, OCR Gateway Science WJEC gcse science chemistry CCEA/CEA gcse science chemistry O Level Chemistry (revise courses equal to US grade 8, grade 9 grade 10)

amount of gas produced by the reaction in a certain amount of

time.

I am going to record the amount of gas produced by the reaction in two

minutes.

Prediction:

I predict that when I increase the temperature of the hydrochloric

acid the reaction will take place quicker so more gas will be produced

in a shorter amount of time. I think this will happen because at a

higher temperature the ions have more kinetic energy so they move

through the solution faster so the ions will collide more often and

more vigorously meaning there is a greater chance they will react as

reactions happen when ions collide. When I draw a graph of my results

the line of best fit will go through the origin because after no time

no reaction has happened if I leave the experiment for long enough all

the lines on my graph will level off and meet as shown below in fig

1.1. I will draw a second graph that plots the rate of re

amount of gas produced by the reaction in a certain amount of

time.

I am going to record the amount of gas produced by the reaction in two

minutes.

Prediction:

I predict that when I increase the temperature of the hydrochloric