C12 Rate Of Reaction Flashcards
What is the definition of rate of reaction?
How quickly the reactants turn into products.
The two equations for the rate of reaction are…
Mean rate of reaction= quantity of reactant used/time taken
Mean rate of reaction= quantity of products formed/time taken
How would you measure the volume of gas produced?
The reaction mixture is connected to a gas syringe or an upside down measuring cylinder. As the reaction proceeds the gas is collected. Unit= cm^3/s
If the graph has a steep gradient, the rate of reaction is what?
Fast/ high rate of reaction
If the rate of reaction gradient is shallow, the rate of reaction is what?
Slow/ low rate of reaction
How do you calculate the mean rate in reaction between two points of a graph?
Get the mass of both points and subtract the later on in time one from the earlier one.
Do the same for the time.
Divide the change in mass by time.
How do you calculate rate of reaction at a specific time from a graph?
Draw a tangent to the graph and calculate its gradient.
The gradient is the change in y divided by the change in x for a right-handed triangle drawn from the tangent .
What is the collision theory?
For a reaction to occur, the reactant particles need to collide. When they collide they have to have enough energy to react or they will just bounce apart.
What is the amount of energy needed to have a reaction called?
Activation energy.
How can you increase the rate of reaction?
Increase the frequency of reactions and increasing the energy of the particle when they collide.
What would happen to the rate of reaction in the container in which the reaction was taking place became hotter?
The increase in temperature would cause the particles to move faster resulting in more frequent collisions and have more energy resulting in more collisions resulting in a reaction.
How would increasing the solute with the same amount of solvent affect the rate of reaction?
The increase in concentration would mean there are more reactant particles in the reactant mixture, so collisions become more frequent.
How would increasing the number of gas particles or making the container smaller affect the rate of reaction?
The increase in pressure of gases would cause there to be less space between particles resulting in more frequent collisions.
How would cutting the solid or grinding the solid do a powder affect the rate of reaction?
The increased surface area of the solid would allow more reactant particles to be exposed, leading to more frequent reactions.
What are catalysts?
A substance that speeds up the rate of reaction whilst not being used up in the reaction.
