Rate of reaction

Question 1

what is the rate of reaction

Answer 1

how quickly reactants are used up or products are produced

Question 2

what is the equation for calculating the mean rate of reaction

Answer 2

mean rate = change in quantity/ time taken

Question 3

what is the unit for rate of reaction in a reaction involving a change in mass

Answer 3

g/s

Question 4

what is the unit for rate of reaction in a reaction involving a change in volume

Answer 4

cm3/s

Question 5

what is the activation energy

Answer 5

the minimum amount of energy colliding particles have to have before a reaction will take place

Question 6

what effect does increasing conc have on a rate of reaction

Answer 6

increases

Question 7

why does increasing conc have this effect

Answer 7

more reactant particles in the same volume lead to more frequent collisions

Question 8

what effect does increasing pressure have on the rate of reaction

Answer 8

increases

Question 9

why does increasing pressure have this effect

Answer 9

less space between particles means more frequent collisions

Question 10

what effect does increasing surface area have on the rate of reaction

Answer 10

increases

Question 11

why does increasing surface area increase rate of reaction

Answer 11

more reactant particles are exposed and able to collide, leading to more frequent collisions

Question 12

what effect does increasing temp have of the rate of reaction

Answer 12

increases

Question 13

why does increasing temp have this effect

Answer 13

particles move faster leading to more frequent collisions - particles have the same activation energy so more collisions result in a reaction

Question 14

what is a catalyst

Answer 14

a substance that increases the rate of reaction but isn’t used up in the reaction

Question 15

how do catalysts increase the rate of reaction

Answer 15

lower the activation energy of the reaction so more collisions result in a reaction

Question 16

what is a reversible reaction

Answer 16

the reactants turn into products and the products turn into reactants

Question 17

what is dynamic equilibrium

Answer 17

the point in a reversible reaction when the rate of forward and backward reaction are the same

Question 18

what are three reaction conditions that can be changed

Answer 18

concentration, pressure and temperature

Question 19

what is le chatiliers principle

Answer 19

the position of the equilibrium shifts to oppose external changes

Question 20

what is the effect of increasing the conc of reactants on a reaction at dynamic equilibrium

Answer 20

favours forward reaction

Question 21

what is the effect of decreasing the conc of products on a reaction at dynamic equilibrium

Answer 21

favours forwards reaction

Question 22

what is the effect of increasing the pressure on a reaction at dynamic equilibrium

Answer 22

favours the reaction that leads to fewest molecules

Question 23

what is the effect of decreasing the pressure on a reaction at dynamic equilibrium

Answer 23

favours the reaction that leads to most molecules

Question 24

what is the effect of increasing the temp on a reaction at dynamic equilibrium

Answer 24

favours the endothermic reaction

Question 25

what is the effect of decreasing the temp on a reaction at dynamic equilibrium

Answer 25

favours the exothermic reaction