The Rate of a reaction tells us how quickly a chemical reaction happens. Fast reactions, like dynamite exploding start and finish within a fraction of a second. Slow reactions like concrete setting, may take days, weeks or even years to finish. During a reaction we can measure how much reactant is used up in a certain time.
Next Energy changes in reactions When a chemical reaction occurs, energy is transferred to, or from, the surroundings - and there is often a temperature change.
For example, when a bonfire burns it transfers heat energy to the surroundings. Objects near a bonfire become warmer. The temperature rise can be measured with a thermometer. Exothermic reactions These are reactions that transfer energy to the surroundings.
The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to become hotter. The temperature increase can be detected using a thermometer.
Some examples of exothermic reactions are: Burning Neutralisation reactions between acids and alkalis The reaction between water and calcium oxide Endothermic reactions These are reactions that take in energy from the surroundings.
The energy is usually transferred as heat energy, causing the reaction mixture and its surroundings to get colder. The temperature decrease can also be detected using a thermometer.
Some examples of endothermic reactions are: Electrolysis is the decomposition separation or break-down of a compound using an electric current. A reaction in which substances are broken down by heat.
In industry it is important for scientists to be able to predict if a reaction is going to be endothermic or exothermic. The main reasons for this are: As energy is given out in exothermic reactions it could be harnessed to be used elsewhere.
Endothermic reactions require energy, therefore fuel is needed which costs money. An increase in temperature makes chemical reactions go faster. So, if the reaction is exothermic giving out heat energy the rate of reaction may increase to an unsafe point causing an explosion.Investigating the Rate of Reaction – Sodium Thiosulphate and Hydrochloric Acid.
Aim: To find out how the rate of reaction nbsp; How does Concentration affect the rate of reaction between is a measure of how quickly a reaction happens. Objective. Our objective is to study the effect of concentration on the rate of reaction between sodium thiosulphate and hydrochloric acid.
The Theory. Investigating the kinetics of reaction between sodium thiosulphate and dilute hydrochloric acid The reaction to be studied is as follows: Na2S2O3 + 2HCl 2NaCl + H2O + SO2 + S There are several possible ways of finding out the reaction rate, as there are four by-products formed in the above reaction.
Extracts from this document Introduction. Introduction In a reaction between Hydrochloric Acid and Magnesium ribbon, the Hydrochloric Acid will dissolve the . Aim In this coursework I plan to investigate the effect of varying the temperature of sodium thiosulphate on the rate of reaction between dilute sodium thiosulphate Solution (ST), Hydrochloric Acid .
Rates of reaction Introduction This experiment is to investigate the rate of reaction between Sodium Thiosulphate and Hydrochloric acid.