Topic 6: The rate and extent of chemical change
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How does the amount of reactant that’s present change during a reaction?
The amount of each reactant will decrease over the course of the reaction, as the reactants get used up when they are converted into products
On a graph of product formed against time, what does a steep slope show?
The steepness of the slope on a rate graph gives you an idea of how fast the rate of reaction is/ how quickly the product is being formed (or reactant is being used up). A steep slope shows the rate of reaction is high/ the product is being formed quickly.
51, 3 Look at the graph below. Which is the fastest reaction?Which is the slowest reaction? How does the graph show reaction B has finished?
Reaction A is the fastest reaction, as it has the curve with the steepest slope. Reaction C is the slowest reaction, as it has the curve with the most shallow slope. Reaction B finished at the point when the lines become flat (as this shows no more product is being formed).
Describe what needs to happen in order for two particles to react with each other.
For a reaction to be successful, the particles must collide with enough energy .
Recation D has a higher activation energy than reaction E. If both reactions are carried out under the same conditions, predict which will have a higher rate and explain why.
Reaction E would most likely have a higher reaction rate than reaction D. The activation energy for reaction E is lower, so at the same temperature, a greater propotion of the reactant particles would have enough energy to reactin reaction E than in reaction D.