1What unique apparatus is needed to measure rate of reaction via volume of gas
Gas syringe placed on retort stand
2What unique apparatus is needed to measure rate of reaction via mass of content?
Cotton wool that allows gas to escape
3Why is the graph when measuring rate of reaction steepest at the start
Speed of reaction is fastest at the start as number of mols / concentration of reactants is the highest
4Why does the gradient of the graph decrease as the reaction proceeds?
Speed of reaction decreases as reactants are being used up, decreasing number of mols / concentration of reactants
5What happens when the rate of reaction is increased?
The frequency of collisions between the particles is increased, the frequency of effective collisions between the particles increase and thus the speed of the reaction is increased
6Why does higher concentration of reactants (for solutions) increase the rate of reaction?
There are more particles reacting per unit volume
7Why does higher pressure of reactants (for gases) increases the rate of reaction?
Particles are brought closer together and there are more particles reacting per unit volume
8Why does decreasing particle size of reactants (for solids) increases the rate of reaction?
Larger surface area exposed for reaction / collision with other reacting particles
9Why does increasing temperature increase the rate of reaction?
particles gain energy and move faster; proportion of particles with sufficient energy to overcome activation energy increases