Graph interpretation
reaction is fastest at the start as the gradient is then the reaction slows down as the gradient is then has stopped by as the line is an no more gas is being produced so the does not change.
Collision theory
More concentrated acid contains more particles per unit
More zinc means greater
particles must to react
more collisions gives more which causes a faster reaction
When collisions stop reaction .
As the concentration of acid decreases the number of acid particles per unit decreases so there are less collisions and the rate of reaction decreases.
As the of zinc decreases as zinc is used the of the collisions decreases and this leads to lower rate of reaction.
When the of the acid or the surface area of the zinc reaches zero the reaction
Liz reads an article on the internet which says that copper acts as a catalyst for this reaction.
She does an investigation to find out if this is true.
How should she do the investigation, and what results should she expect?
She should repeat the experiment using a copper keeping the mass and size of the pieces the same and the , volume and type of acid the same. She should also make sure the reaction takes place at the same
Liz should find:
The line of best fit graph would be at the start.
The time taken for the line to become flat would .
The final loss in mass would be
Indicating that the copper catalyst had the rate of reaction.
By providing an alternate reaction of lower energy.
