Rates Of Reaction 2

Question 1

Name 5 ways a reaction can be made to go faster

Answer 1

1- increased temperature 
2- increased surface area 
3- increased concentration
4- presence of a catalyst 
5- increased pressure (if the reactants are gasses)

Question 2

What 2 things does the rate of reaction depend on

Answer 2

1- the frequency of collisions between particles

2- he energy with which particles collide

Question 3

What is the activation energy?

Answer 3

Is the minimum amount of energy needed for the particles to react is called the activation energy.

Question 4

If you change the number of molecules that have the activation energy what will change?

Answer 4

The speed of the reaction

Question 5

If particles collide with less energy than the activation energy what will happen?

Answer 5

They will not react, they will bounce off each other because there isnt enough energy to collide with

Question 6

Why will increasing the surface are or a solid increase the rate of reaction?

Answer 6

Because it will allow more surface area for the particles to collide with and react

Question 7

Why will increasing the temperature increase the rate of reaction

Answer 7

Because it will give them more kinetic energy, allowing them to have more energy to collide with
The particles will move faster, moving faster they will collide more frequently

Question 8

Why does increasing the concentration increase the rate of reaction

Answer 8

Increasing the concentration pf one or more of the reactants will speed up because the molecules are more likely to collide. They have more to react with

Question 9

What is a catalyst

Answer 9

Are substance ps that change the speed of a chemical reaction but is not used up during that reaction

Question 10

Does a catalyst lower the activation energy

Answer 10

Yes

Question 11

Is more product produced with a catalyst?

Answer 11

No they just produce the same amount of product more quickly

Question 12

iron a catalyst in the production of?

Answer 12

Ammonia

Question 13

Platinum is a catalyst in the catalytic…

Answer 13

Converters in a car exhaust

Question 14

Why is catalysts important in industry? 2

Answer 14

• products can be made faster

- high temperatures are not needed which reduces costs in fuel and helps the environment

Question 15

If a reversible reaction is exothermic in one direction what is it in the opposite?

Answer 15

Endothermic

Question 16

What is equilibrium

Answer 16

When the forwards and backwards reactions are occurring at the same rate in a closed system

Question 17

When is equilibrium reached?

Answer 17

When the forward and reverse reactions occur at exactly the same rate but the apparatus must prevent the escape of the reactants and the products. This is called a closed system

Question 18

At equilibrium….. X2

Answer 18

1- the rate of the forward reaction equals the rate of the backward reaction
2- the concentrations of reactants and products do not change

Question 19

If the concentration of reactants is GREATER than the concentration of products we say the equilibrium is on the…..

Answer 19

Left

Question 20

If the concentration of the reactants is LESS than the concentration of the products the position of the equilibrium is on the

Answer 20

Right

Question 21

During equilibrium how fast is the reaction

Answer 21

Initially, the forward reaction is fast but then it slows as the reactants are used up

Question 22

Theoretical yeild=

Answer 22

Is the maximum possible yield from a chemical reaction

Question 23

Actual yield=

Answer 23

Is the yield of product that you really get from carrying out a chemical reaction

Question 24

Percentage yield

Answer 24

Is the percentage of product that you get compared to what is theoretically possible

Question 25

In an exothermic reaction, what is given out

Answer 25

Heat

Question 26

In an endothermic reaction heat is taken in

It is —

Answer 26

Cold