Rate Of Reactions

Question 1

What is le chatliers principle

Answer 1

If​ ​a​ ​system​ ​is​ ​at​ ​equilibrium​ ​and​ ​a​ ​change​ ​is​ ​made​ ​to​ ​any​ ​of​ ​the​ ​conditions,
then​ ​the​ ​system​ ​responds​ ​to​ ​counteract​ ​the​ ​change​ ​(Le​ ​Chatelier’s​ ​principle)

Question 2

What are catalyst and how do they effect rate of reaction

Answer 2

Substances that speed up chemical reactions without being used up

Question 3

How is the rate of reaction effected by changing the pressure

Answer 3

Increasing the pressure increases the frequency of collisions and so increases the rate of reaction

Question 4

What is the rate of reaction

Answer 4

The amount of product formed over time or how quickly reactant get used up

Question 5

Describe collision theory

Answer 5

Chemical reaction occur when reacting particles collide with each other with sufficient energy
The activation energy is the amount of energy needed for particles to react

Question 6

Rate of reaction equation

Answer 6

Rate of reaction = amount of reactant used up/time

Rate of reaction = amount of product formed/time

Question 7

How do you find the rate of reaction in a graph

Answer 7

1.) draw a tangent
2.) find the gradient of a tangent

Question 8

How do catalyst decrease the activation energy

Answer 8

Catalyst provide a different pathway for a chemical reaction that has a lower reaction energy

Catalyst decrease the activation energy therefore increasing the proportion of particles with energy

Question 9

How can you tell that a reaction is complete

Answer 9

No more gas is produced and the line graph become horizontal

Question 10

How do reversible reactions work

Answer 10

If a reversible reaction is endothermic one way ,it is exothermic in the opposite direction

The same amount of energy is transferred each way

Question 11

What happens in a reversible reaction occurs in a closed system

Answer 11

Equilibrium is reached when reactions occur exactly at the same rate in each direction