French essay

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Sub units Decomposition reactions | Thermal decomposition | Catalytic decomposition | Electrolytic decomposition

When a substance decomposes, it breaks up into two or more simpler substances.

Decomposition can take place in a number of ways Help with essay on french essay

Thermal decomposition

Catalytic decomposition

Electrolysis

Sub units Decomposition reactions | Thermal decomposition | Catalytic decomposition | Electrolytic decomposition

What is the rate of a chemical reaction? The rate of a chemical reaction is how fast the reactants react.

How to find the rate of a reaction? In general to find the rate of a reaction, you should measure either the amount of reactant used up per unit of time or the amount of product produced per unit of time.

The rate during the reaction does not stay constant, it changes throughout the reaction, its greatest at the start but gets slower as the reaction proceeds. I think this is mainly to do with the fact the longer the reaction has taken place the more of the reactants react leaving fewer reactants with less chance of reacting.

Successful collision. For the reactants to be able to react they have to successfully collide with each other. The chance of a successful collision can be increased or decreased by using many different factors.

Temperature Temperature alters the rate of a reaction by supplying the reactant particles with more energy, the more energy the reactants have the faster they move around increasing theyre are chance of bumping into one another and having a successful collision. Also the more energy they get from the heat the more particles have enough energy to react, this is known as activation energy. Generally the greater the temperature the faster the rate of a reaction, the rate doubles every 10°c.

Surface Area The greater the surface area of the reactants the more particles are available for a successful collision.

A Catalyst A catalyst is a substance that changes the rate of a chemical reaction but remains chemically unchanged itself.

Concentration Concentration effects the rate of a reaction because the higher the concentration of particles the greater the chance of a successful collision. The general trend for the concentration is the rate doubles as the concentration doubles (theyre directly proportionate).

What is Activation energy? Activation energy is the amount of energy required for the reactants to successfully react. The reactants need a certain amount of energy, any extra energy increases theyre chance of a successful collision.

Experiment

To investigate the rate of reaction I have decided to use the concentration as a variable. I am going to use marble chip (Calcium Carbonate) and Hydrochloric acid. I will alter the concentration of the hydrochloric acid each time, and I will measure the amount of Carbon Dioxide product given off.

I have chosen to use these because during the reaction Carbon Dioxide is given off, this is a gas and highly insoluble in water. The method I have planned will accommodate this.

Though some carbon dioxide is soluble in water the amount is negligible,

At room temp (0°c) in 1l of water 1.6 10 will dissolve.

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