C.5 - Chemical Reactions

Question 1

What is dynamic equilibrium?

Answer 1

When the rate of forward reaction, is equal to rate of backwards reaction

Question 2

Which reaction is happening at equilibrium?

Answer 2

Both

Question 3

What is a closed system?

Answer 3

A sealed container, and none of the reactants can escape

Question 4

Can equilibrium happen at different rates?

Answer 4

Yes

Question 5

Do both reactions happen at the same speed?

Answer 5

No, as the reactants turn into products. The forward rate of reaction slows down and the backwards rate of reaction speeds up

Question 6

At equilibrium are both reactions still happening?

Answer 6

Both reactions are still happening but they cancel eachother out

Question 7

Will the concentration of reactants and products change when in equilibrium?

Answer 7

No they stay the same but they arn’t the same amount

Question 8

What is Le Chateliers Principle?

Answer 8

Change the conditions of a reversible reaction the position of equilibrium will shift to counter act the change

Question 9

Decreasing the temperature of an exothermic reaction does what?

Answer 9

Equilibrium moves in the exothermic direction

Question 10

Increasing the temperature of an endothermic reaction does what?

Answer 10

Equilibrium moves in the endothermic direction

Question 11

Increasing the pressure does what to equilibrium?

Answer 11

Equilibrium position moves to the least number of molecules

Question 12

Decreasing the pressure, does what to equilibrium?

Answer 12

Equilibrium moves to the most number of molecules

Question 13

What does concentration do to the equilibrium?

Answer 13

Whichever side increases concentration, equilibrium shifts to other side to counter act

Question 14

What is the definition of a chemical reaction?

Answer 14

A process where reactants transform into products through the breaking and forming of bonds.

Question 15

What is the definition of the rate of a reaction

Answer 15

The speed at which reactants are converted into products.

Question 16

What are the factors that affect the rate of reaction?

Answer 16

Temperature, concentration, surface area, and catalysts

Question 17

What effect does increasing temperature have on the rate of a chemical reaction?

Answer 17

It increases the rate of reaction.

Question 18

What does surface area do to the rate of reaction

Answer 18

Increases rate of reaction

Question 19

What is a catalyst?

Answer 19

A substance that increases the rate of a reaction without being consumed in the process.

Question 20

True or False: Catalysts change the position of equilibrium in a reversible reaction.

Answer 20

False

Question 21

Fill in the blank: A higher concentration of reactants generally leads to a _____ rate of reaction.

Answer 21

faster

Question 22

What is the role of surface area in reactions?

Answer 22

Increasing surface area allows more particles to collide, increasing the rate of reaction.

Question 23

What happens to the rate of reaction as reactants are consumed?

Answer 23

The rate of reaction decreases.

Question 24

True or False: Increasing the pressure only affects reactions involving gases.

Answer 24

True

Question 25

What is an electromagnetic wave?

Answer 25

transverse waves. Their vibrations or oscillations are changes in electrical and magnetic fields

Question 26

What is dynamic equilibrium?

Answer 26

A state in a reversible reaction where the rates of the forward and reverse reactions are equal.

Question 27

Multiple Choice: What happens to the equilibrium position if the concentration of reactants is increased? A) Shifts to the left B) Shifts to the right C) No change D) None of the above

Answer 27

B) Shifts to the right

Question 28

What does Le Chatelier's Principle state?

Answer 28

If a system at equilibrium is subjected to a change, the system will adjust to counteract that change.

Question 29

True or False: A decrease in temperature favors the exothermic direction of a reversible reaction.

Answer 29

True

Question 30

Fill in the blank: The _____ of a reaction is influenced by the nature of the reactants.

Answer 30

rate

Question 31

What is meant by the term 'activation energy'?

Answer 31

The minimum energy required for a reaction to occur.

Question 32

Multiple Choice: Which of the following can lower the activation energy of a reaction? A) Heat B) Catalysts C) Increased concentration D) All of the above

Answer 32

B) Catalysts

Question 33

What is the effect of a catalyst on the activation energy?

Answer 33

It lowers the activation energy required for the reaction.

Question 34

True or False: The presence of a catalyst affects the energy of the reactants and products.

Answer 34

False

Question 35

What is the relationship between reaction rate and collision frequency?

Answer 35

Higher collision frequency typically increases the reaction rate.

Question 36

Fill in the blank: In a chemical reaction, the _____ must collide with sufficient energy to react.

Answer 36

reactants

Question 37

What can be concluded about the effect of concentration on the rate of reaction?

Answer 37

Higher concentration increases the number of collisions, thus increasing the rate.

Question 38

Explain, in the collision theory. How temperature affects rate of reaction?

Answer 38

There is an increase in energy - activation energy is reached quicker, particles move faster. and that will increase the reaction rate.

Question 39

Explain, in the collision theory. How concentration affects rate of reaction?

Answer 39

The chances for collisions between molecules are increased because there are more molecules so things are reacting more frequently. Increasing rate of reaction

Question 40

Explain, in the collision theory. How pressure affects rate of reaction?

Answer 40

The particles in the gas state become more crowded meaning they react more frequenly

Question 41

Explain, in the collision theory. How catalysts affects rate of reaction?

Answer 41

Lower activation energy so collisions happen quicker