Investigation of Rate of Reaction

Investigation of Rate of Reaction

INTRODUCTION

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I will be conducting an experiment on the rate of reaction for my GCSE

coursework. . We will be reacting sodium thiosulphate with

hydrochloric acid. I will be investigating the effects had on rate of

reaction.

When sodium thiosulphate and hydrochloric are mixed, a yellow precept

of sulphur is produced. The solution becomes increasingly difficult to

see through as more and more sulphur is formed.

WHAT IS RATE OF REACTION?

The rate of reaction tells us how quickly a chemical reaction happens.

Rate is measuring of the change that happens in a single unit of time.

Cause its not enough to know if a reaction is fast or slow.

We can't work out the rate of reaction from its chemical equation.

Equations can only tell us how much product we can get. They don't say

how quickly it is made.

We can only find the rate by actually doing experiments. During a

reaction, we can measure how much reactant is used up in a certain

time. On the other hand, we might choose to measure how much product

is formed in a certain time.

The factors that affect the rate of a chemical reaction are:

· Temperature

· Surface area

· Catalyst

· Concentration

· Pressure (only occurs in gases)

AIM

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A reaction can be made to go faster or slower by changing the

temperature of the reactants

A reaction goes faster when the temperature is raised. Cause the

particles

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Have more energy. Therefore they move around more quickly.

As they travel faster, there are more collisions in a certain time.

But there is another reason why the rate increases.

Some colliding particle just bounce off each other, they don't bang

together hard enough to start a reaction. They don't have enough

energy.

However, at higher temperatures, the particles are moving faster. They

crash together harder; therefore, more collisions produce a reaction.