Rates Of Reaction

Question 1

Who does surface area affect the rate of a reaction

Answer 1

• larger surface area increases rate because the reactant particles are more expossed in the smaller lumps, and a reaction can happen quicker. Thererfore frequent collisions creating a reaction are made
• small surface are decreases rate of reaction because all the surface particles have to react with the solution before it reaches the reactant ones on the inside.

Question 2

How does concentration affect rates of reaction

Answer 2

• increasing concentration of reactants in a solution increases rate of reaction
• there are more particles in greater concentrations
• therefore frequent collisions
• therefore more reactions

Question 3

How does pressure effect rates of reactions

Answer 3

• DECREASES VOLUME AND INCREASES CONCENTRATION
• Increasing pressure gives less space and makes particles closer together
• squashes them together
• there are now more particles in the given space
• increasing chances of them colliding
• increasing the rate at which reactions are made

Question 4

How do catalysts effect the rate of a reaction

Answer 4

• they provide an alternate pathway to the products with a lower activation energy.
• this then increase frequency of EFFECTIVE collisions
• the catalysts isn’t used up and can continue this over and over again

Question 5

How does temp effect the rate of a reaction

Answer 5

• when temp increases, more energy is transferred to the particles
• particles now move faster and collide more frequently
• these energetic collisions are also much more succesful
• therefore it increases rate of reaction

Question 6

Decribe collision theory

Answer 6

• when particles collide, a reaction can occur
• in order to create a reaction from collisions it need to have the right activation energy
• this is the amount of energy required for particles to collide and react
• increasing collisions, energy, decreasing activation energy can therefore increase how many reactions are made
• increasing rate of reaction

Question 7

Why do we use catalysts

Answer 7

• cheaper
• they can be added as pellets, fine powder and gauzes
• they can be used over and over again
• they don’t require fossil fuels like temp or pressure