THE RATE AND EXTENT OF CHEMICAL CHANGE Flashcards
The steeper the line on the graph the ……… the rate of reaction
faster
the quickest reactions have the _______ lines and become flat in the _______ time
steep and least
the more collisions there are…..
the faster the rate of reaction
particles have to collide with __________ for the collision to be successful
enough energy
what is activation energy
the minimum amount of energy that particles need to react
name 4 things that the rate of reaction depends on
temperature
the concentration of solution or pressure of gas
surface area
catalysts
increasing the temperature……
increases the rate of reaction
why does increasing the temperature, increase the rate of reaction
the higher the temperature, the faster the rate of reaction because particles have more energy, so can therefore move around faster, this will lead to more frequent successful collisions
why does increasing the pressure or concentration increase the rate of reaction
the higher the pressure/concentration the faster the rate of reaction will be this Is because there are more particles in a fixed volume so there is a higher chance of a successful collision
why does increasing the surface area increase the rate of reaction
it increases the rate of reaction because there are more particles available to react, leading to more frequent successful collisions
do catalysts get used up in the reaction themselves
no catalysts do not get used up in the reaction
what is a catalysts and what does it do
catalysts speed up the rate of reaction by providing an alternative reaction pathway with a lower activation energy
how do you find out the mean reaction rate on a graph
you find the overall change in y value and then divide it by the time taken for the whole reaction
how do you find the rate of reaction at a particular point
draw a tangent to the curve (at the point you want)
then work out the gradient of the tangent
reversible reactions will reach…..
equilibrium
