How fast? Flashcards
Give the 2 equations of how you can find the rate of reaction
Amount of reactant used/time
OR
Amount of product formed/time
How else could you possibly measure the rate of reaction?
Measuring the time taken for a solid to appear in a solution
If a gas is given off, you can measure the time taken to collect that gas
How can you find the rate of reaction from a graph?
The gradient
What is the relationship between rate and time?
They are inversely proportional; the faster the rate the shorter the time
What does collision theory state?
That reactions can only occur if particles collide. The particles must collide with enough energy to react
What is the minimum energy required for substances to react called?
Activation energy
What type of factors will increase the rate of a reaction?
Factors that increase the chance of collisions or the energy of particles
Give examples of factors increasing rate of reaction
Temperature Concentration of solutions Pressure of gases Surface area of solids Using a catalyst
How does surface area increase the rate of reaction?
Increasing the SA, exposes more of the surface. This means more frequent collisions in the same time and this increases the rate of reaction.
How does temperature effect the rate of reaction?
Temperature increases the speed of the particles, so they collide more often and with more energy. They also reach the activation energy required much quicker. This increases the rate of reaction
Roughly by how much will the rate of reaction will increase by if the temperature is increased by 10 degrees?
Double
How can the rate of reaction be measured?
Measuring how much reactant is used
Measuring how much product us formed and the time taken
How does the concentration or pressure effect the rate of reaction?
A higher concentration means more particles are dissolved in the same volume, meaning the particles are closer together and so collide more often
How do catalysts work?
They speed up reactions by lowering the activation energy of the reaction so more collisions result in a reaction.
Why can catalysts be reused?
It changes the rate of reaction but is not used up or reacts
