Chemistry - Rates Of Reaction

Planning

Aim ¡V To investigate the effect of concentration on the rate of reaction between marble chips and excess hydrochloric acid.

Introduction

Rate Of Reaction
Reactions can either be slow or fast. For example, for concrete to set, it takes two to three days. However, when solutions of silver nitrate and sodium chloride are mixed, a precipitate is formed very quickly. Rate is defined as the ¡§measure of change that happens in a single unit of time¡¨. Measuring exactly how fast a reaction is can be very useful; in a factory, the chemical engineers need to know exactly how fast each reaction is, and how long it takes to complete. They need to find the reaction¡¦s rate. Firstly, what happens when a reaction takes place? When an acid is added to a reactant, a reaction takes place. The particles in the acid move around continuously. For this reaction to take place, the acid particles must collide with the reactant with enough energy to form a product.



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