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Rates of Reaction
Descripción
A comprehensive mind map of various factors involved with Rates of Reaction.
Sin etiquetas
science
rates of reaction
energy and rates
science
international baccalaureate
Mapa Mental por
Andrew Barton
, actualizado hace más de 1 año
Más
Menos
Creado por
Andrew Barton
hace casi 9 años
45
1
0
Resumen del Recurso
Rates of Reaction
The rate of reaction tells us how quickly a chemical reactions happens
Calculation: How much reactant is used up ÷ time it takes to complete the reaction
eg. Amount of hydrogen gas formed (cm3) ÷ Time for reactant to be used up
Effect of Surface Area
Measure of how much surface is exposed
As the surface area is increased, the rate of reaction increases
ex: A block a wood will burn slower than wood shavings as there is less particles to react with on the surface.
Explanation: As the surface area is increased, there are more open particles that can be reacted with
Collision Theory
Before a chemical reaction can start, particles must crash together
The more collisions between particles in a given time, the faster the reaction.
Effect of Temperature
When particles are heated, they gain more thermal energy and they move around quicker.
As they travel faster, there are more collisions in a certain time.
Therefore, reactions get faster as temperature is raised.
Also, some particles when colliding just bounce off each other because they don't have enough energy.
At higher temperatures, particles are moving faster and they collide with more force, therefore more collisions produce reactions.
So raising the temperature: 1) Makes particles collide more often in a certain time. 2) Makes it more likely that collisions result in a reactions.
Catalysts
A catalyst is a substance which speed up a chemical reaction. At the end of the reaction, the catalyst is chemically unchanged.
Before reactants can turn into products, they need enough energy to start the reaction.
The energy needed to start a reaction is called its ACTIVATION ENERGY.
A catalyst LOWERS the activation energy.
Catalysts make it easier for particles to react as less energy is needed to start a reaction.
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