rates of reaction

Question 1

what is the equation for rate of reaction?

Answer 1

RoR=amount of reactant used / time
or…
RoR=amount of product produced / time

Question 2

what are the 4 factors that affect the rate of reaction?

Answer 2

• tempurature
• concentration
• surface area
• catalysts

Question 3

what does the cotton wool investigation investigate?

Answer 3

the reaction between marble chips and hydraulic acid

Question 4

what does the gas syringe investigation investigate?

Answer 4

the effects of catalysts on the rate of reaction

Question 5

how do you do the cotton wool experiment?

Answer 5

put a flask on a mass balance, put marble chips and dilute hydraulic acid in the flask, then put cotton wool at the top of the flask, start the stop watch

Question 6

why do you put cotton wool in the top of the flask?

Answer 6

to allow gas to escape but not liquid

Question 7

how do you do the gas syringe experiment?

Answer 7

put hydrogen peroxide solution and managanse dioxide powder in a flask and put a gas syringe and a stopper on top and allow the gas produced to make the syringe expand

Question 8

how does temperature affect RoR?

Answer 8

• temperature is increased, the particles move faster which creates a higher frequency of collisions
• high temperatures increase kinetic energy (reactions can only happen if particles collide with enough energy)

Question 9

how does concentration affect RoR?

Answer 9

• if there are more particles then there is a higher concentration and has a higher frequency of collisions
• if a solution is more concentrated it means there are more particles of a reactant, in the same volume

Question 10

how does surface area affect RoR?

Answer 10

• if one reactant is a solid, breaking it into smaller peices will increase its surface area to volume ratio
• if the particles have more area to work on, the frequency of collisions will increase

Question 11

how do catalysts affect RoR?

Answer 11

they speed up a chemical reaction, or lowers the temperature or pressure needed to start one

Question 12

true or false? the steeper the line on a graph, the faster the RoR?

Answer 12

true

Question 13

true or false? the slowest reactions have the steepest lines and become flat in the smallest amount of time?

Answer 13

false. it’s: the quickest reactions have the steepest lines and become flat in the smallest amount of time

Question 14

what is the activation energy of a reaction?

Answer 14

the minimum amount of energy particles need for the reaction to take place