Reversible Reactions/rate Of Reaction

Question 1

What is exothermic reaction?

Answer 1

When energy is transferred into the surroundings.

Question 2

What is endothermic reaction?

Answer 2

Energy is taken in from the surroundings.

Question 3

What is equilibrium?

Answer 3

When the rate of forward reaction is equal to the rate of backward/reversed reaction.

Question 4

What happens to the reaction when the temp increases?

Answer 4

When temp increases, the equilibrium moves to the endothermic direction to remain its current temperature.

Question 5

What happens to the reaction when temp decreases?

Answer 5

When temp decreases, the equilibrium moves to the exothermic direction to remain its current temperature. Since exothermic direction releases energy into its surroundings.

Question 6

What happens to reversible reactions in a closed system?

Answer 6

They will reach equilibrium, since everything reacts together due to the products and reactants not able to escape.

Question 7

What is a reversible reaction?

Answer 7

When the reactants are able to form products, in which these products are able to reform into the reactants.

Question 8

When Hydrated Copper (II) Sulfate is heated, it loses its
water of crystallization and turns into anhydrous Copper (II)
Sulfate, write the chemical equation.

Answer 8

CuSO4.5H2O (s) ⇌ CuSO4 (s) + 5H2O (l)

Question 9

To make the forward reaction work, the hydrated copper sulfate must be heated all the time, what type of reaction is this?

Answer 9

Endothermic reaction

Question 10

What will happen if water is added to anhydrous copper sulfate?

Answer 10

It will be an exothermic reaction. Because energy is released when adding the water.
It will turn blue
It will be turn into hydrated copper sulfate due to the water.

Question 11

How will a student remove unreacted copper oxide from a copper sulfate solution?

Answer 11

Filtration, they’re able to filter the unreacted copper oxide to remove it.

Question 12

Why will a reaction be heated up?

Answer 12

To increase the rate of reaction.

Question 13

What is DYNAMIC equilibrium

Answer 13

when the rate of forward reaction is equal to the rate of backward reaction in a closed system.

Question 14

Two conditions that can affect the position of equilibrium-

Answer 14

Temperature, and pressure.

H2O2 + H3 = H4
If pressure increases, the equilibrium would move to the direction which has less moles. So the equilibrium moves to the right
If pressure decreases, the equilibrium would move to the direction which has more molecules. So the equilibrium would move to the right.

Question 15

What is yield of reaction?

Answer 15

The amount of product made in a reaction

Question 16

Which arrow is exo, and endo?

Answer 16

—> exo
<— endo
If the question has not stated that the compounds have been heated,cooled,etc then just assume this is the case.

Question 17

How will a student obtain copper sulfate crystals by the copper sulfate solution?

Answer 17

By crystallsation/ heating the solution

Question 18

What are catalysts?

Answer 18

Are substances that speed up the rate of a chemical reaction without being changed or used up during the reaction.

Question 19

What are the factors which affect the rates of chemical reactions?

Answer 19

Concentration, pressure, temperature, catalysts, surface area.

Question 20

What is the formulas of rate of reaction?

Answer 20

Rate of reaction = amount of product formed/Time taken (s)
Rate of reaction = amount of reactants used/time taken (s)

Question 21

What is collision theory?

Answer 21

Frequency of collisions, or collision theory states how a chemical reaction can only take place if reacting particles collide with eachother with sufficient energy.

Question 22

What is activation energy?

Answer 22

The minimum amount of energy that particles must have to react together.