Key Area 1.1 - Rates Of Reaction Flashcards
What is necessary for a reaction to occur
For a reaction to occur, reactant particles must collide
Describe the affects temperature has on the rate of reaction
The higher the temperature the faster the reaction
Increasing the temperature, increases the ENERGY of the particles making them move FASTER and more COLLISIONS can occur
Describe the affect the concentration has on the rate of reaction
The higher the concentration, the faster the reaction
There are MORE reactant PARTICLES in a given volume of SPACE. The leads to a greater number of COLLISIONS
Describe the affect particle size has on the rate of the reaction
Small Particle Size = Large Surface Area
If the particle size is reduced(reactant broken down into smaller pieces) the rate of reaction increases
This gives the particles a larger SURFACE AREA allowing more COLLISIONS to occur and more particles can come into CONTACT
Describe the affect of a catalyst on the rate of reaction
Most catalysts increase the rate of reaction
Catalysts alter the rate of a chemical reaction allowing it to work at lower temperatures but are not used up during the reaction
Example, Aluminium Oxide
What is the test for Oxygen Gas
Relights a glowing sprint
What is the test for hydrogen gas
Burns with a squeaky pop
What is the test for CO2
Turns lime water cloudy
Suggest methods as to how to follow the rate of a reaction
Measuring the volume of gas produced
OR
Measuring the loss in mass over a period of time
What is the equation for measuring the rate if reaction
Rate = change in volume/mass
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Change in time
The units for rate of reaction are centimetres cubed. Time is always given in seconds and so the rate is Cm3s-1
Name the 4 factors which can affect the rate of reaction
Temperature
Concentration
Particle Size
Catalysts
