Rates of Reaction Flashcards
What is rate of reaction?
The rate of reaction is about how long it takes for the product to form (or the reactants to all be used up)
What is a chemical reaction?
It is the process of taking chemicals (reactants) and combining them in a way that makes them change into something else (products)
What makes a reaction or collision, successful?
A successful reaction occurs when particles collide with sufficient energy, at the correct direction
What is activation energy?
Activation energy is the minimum amount of energy required for a reaction to occur
What are the ways to measure rate of reaction?
How quickly gas is produced,
How quickly the mass of reactants decreases/increases,
Time it takes for a colour to appear or disappear,
The time it takes for a solid reactant to vanish
The steeper the line on a reaction rate graph means..
the faster the reaction rate
A perfect horizontal line on a reaction rate graph menas..
nothing is happening or gone to a stop
What is concentration
The concentration is the amount of a particular substance present in a given volume - telling us how much “stuff” is in our sample.
How do you INCREASE the concentration
adding more reactant particles in your solution
What happens when the concentration is increased?
This means its become more crowded within the volume, meaning theres more particles and less space which indicates that it becomes more likely that they’ll crash and collide with another particle, with more collisions occurring, the reaction rate increases.
What happens when the concentration is decreased?
When decreased, the volume has much more space meaning theres more room to move for the particles meaning they are less likely to crash and collide into one another, this decreases the reaction rate and less collisions will occur.
What is temperature affect the rate of reaction?
The temperature is the amount of heat energy present per particle meaning the more we increase the heat, the more energy our particles will gain.
What does kinetic energy got to do with temperature
Because the more heat energy from the temperature, the more kinetic energy there is meaning that they will move more faster and the sooner they/ll collide with another particle. And because they are moving at very high speeds, it will be a high impact crash which tells us that the greater the temp, the more successful collisions, and there fore reaction, are likely to occur
What does activation energy got to do with temperature
Because reactions dont start until reactants manage to get over the energy barrier so they need to reach the activation energy. The more heat energy put into the system, the more likely for the particles to have the minimum amount of energy so if the temp rises, the reactions will start more sooner so the reaction rate increases.
What does increasing the surface area do?
Increasing the surface areas means the particles that are being exposed is increased meaning more particles are available to react, giving more chances for reactants to collide and react meaning the reaction rate increases.
