RATES AND EQUILIBRIUM Flashcards
how do you work out the rate of reaction?
🔥 find out how quickly it took for the reactant to be used up whilst making the product
🔥 see how quickly it took the product to be made
if the rate of reaction is fast, how steep would the graph be?
very steep
what is the equation to find the mean rate of reaction?
. quantity of quantity of
reactant used OR. product formed
——————– ————————-
time taken time taken
What is the collision theory
the collision theory states that when two particles collide, they need a certain amount of energy to change into new substances. the minimum amount of energy to do so is called ACTIVATION ENERGY.
you can increase the rate of reaction in the collision theory if you…
❗️ increase the frequency of which the particles collide.
❗️ increase the energy they have when they collide
increasing temp
what is a catalyst?
a substance that can change the rate of the reaction by making it quicker
how does changing the surface area of a substance help the rate of reaction?
when a substance has a smaller surface area, more collisions can happen at the same time ( and the surface area to volume ratio ) so a powder would react faster than the same amount of substance in lumps.
what 4 things does the rate of reaction depend on?
☀️ temperature
☀️ surface area
☀️ the concentration of solution or the pressure of the
gas
☀️the presence of a catalysthow does increasing the temperature increase the rate of reaction?
🌡 As the temp increases, the energy in the particles
increases causing them to collide more….
🌡 ….. and with more energy
how does increasing the concentration/pressure of a solution/gas increase the rate of reaction
👉🏻 The more concentrated the solution, the more particles there are in the same solution, therefore there are more collisions
👉🏻 This is the same
how does using a catalyst increase the rate of reaction?
a catalyst speeds up the rate of the reaction without being used up in the reaction itself
catalysts work by decreasing the activation energy by creating an alternative reaction pathway with a lower activation energy.
What is an example of a natural catalyst?
enzymes are known as BIOLOGICAL catalysts
draw a diagram to show how a catalyst works.
https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwig073AtYbeAhVC6RoKHVCVC34QjRx6BAgBEAU&url=https%3A%2F%2Fwww.chemguide.co.uk%2Fphysical%2Fbasicrates%2Fcatalyst.html&psig=AOvVaw2GEps2M6PUX2g7jmERdEcJ&ust=1539623181018900
