C8 Rates and equilibrium

Question 1

mean rate of reaction

Answer 1

quantity of reactant used / time
OR
quantity of product formed / time

Question 2

rate of reaction from graph

Answer 2

gradient of line at any given time
steeper gradient= faster reaction
at specific time - draw tangent to curve and calculate gradient

Question 3

activation energy

Answer 3

the minimum amount of energy particles need before they can react

Question 4

increasing reaction rate

Answer 4

increase sa: v -> increased frequency of collisions between reacting particles
temperature -> particles collide more frequently and energetically. higher proportion of particles have energy greater than activation energy
incr conc -> more frequent collisions
pressure -> same particles, smaller space, more frequent collisions
catalysts -> lowers activation energy

Question 5

collision theory

Answer 5

particles not only have to bump into each other, they need to have enough energy in the collision for a reaction to take place

Question 6

reversible reaction

Answer 6

products of reaction can make original reactants

amount of energy transferred to surroundings is equal both ways of reaction