the rate and extent of chemical change

Question 1

what is the equation for mean rate of reaction

Answer 1

amount of reactant uses/product formed / time taken

Question 2

how does surface area affect the rate of reaction

Answer 2

Larger surface area increases the frequency of collisions between reacting particles

Question 3

how does temperature affect the rate of reaction

Answer 3

As the temperature increases, particles gain more kinetic energy. Particles are colliding more frequently and more energetically in a given time, so a higher proportion of particles have a greater energy than the activation energy so the RoR increases

Question 4

how does concentration effect rate of reaction

Answer 4

Increasing concentration of reactants in solutions means there are more particles in a given volume. This increases the frequency of collisions between particles. A higher proportion of particles will collide with a greater energy than the activation energy so the RoR increases.​

Question 5

how does pressure affect rate of reaction

Answer 5

Increasing pressure of reactants means there are more gas particles in a given volume. This increases the frequency of collisions between particles. A higher proportion of particles will collide with a greater energy than the activation energy so the RoR increases

Question 6

how does a catalyst affect rate of reaction

Answer 6

A catalyst speeds up a chemical reaction by lowering the activation energy, but is NOT used up itself during the reaction. It remains chemically unchanged. Different catalysts are needed for different reactions.​

Question 7

what is activation energy

Answer 7

the minimum amount of energy required to cause a reaction

Question 8

what is a catalyst

Answer 8

a substance which increases chemical reaction without being used up in the process also increase reaction by providing a different pathway with lower activation energy

Question 9

what is collision theory

Answer 9

explains how various factors affect rates of reactions. According to this theory, chemical reactions can occur only when reacting particles collide with each other and with
sufficient energy

Question 10

what is le chateliers principle

Answer 10

is the conditions of a reversible reaction are changed then the equilibrium will shift to try and counteract that change