Chemical Energetics

Question 1

What is exothermic?

Answer 1

Reaction/process that releases energy into surroundings

Question 2

In an exothermic reaction will the reactant or product have more energy?

Answer 2

Reactant

Question 3

Examples of exothermic reactions/ processes?

Answer 3

Combustion of fuels
Reaction of acids w. Metal
Neutralisation of acids w. Bases
Production of energy from electrochemical cells

Question 4

What is endothermic?

Answer 4

Reaction/process which absorbs energy

Question 5

In an endothermic reaction/process, will the reactant or product have more energy?

Answer 5

Product

Question 6

Examples of endothermic reactions/processes

Answer 6

Thermal decomposition of carbohydrates
Electrolysis
First stages of photosynthesis

Question 7

What do energy level diagrams show?

Answer 7

Energy change of reaction in reactants to products

Question 8

On an energy level diagram what do the x and y axis show?

Answer 8

X= reactants and products
Y= energy change of reaction

Question 9

What type of energy is given out and absorbed in endo/exothermic reactions

Answer 9

Heat

Question 10

Do exothermic reactions have positive or negative reactant values?

Answer 10

Negative

Question 11

Do endothermic reactions have positive or negative reaction values?

Answer 11

Positive

Question 12

On an endothermic energy level diagram which way is the arrow pointing?

Answer 12

Up

Question 13

Is breaking bonds endo or exo?

Answer 13

Endothermic

Question 14

Is making bonds making endo or exo

Answer 14

Exothermic

Question 15

Define fuel

Answer 15

Any substance that releases energy when burned

Question 16

Advantages of using hydrogen as a fuel

Answer 16

Doesn’t pollute

Releases more energy per kilo gram than other fuels

Question 17

Disadvantages of using hydrogen as a fuel

Answer 17

Expensive

Difficult to store

Question 18

What type of energy do nuclear power stations use?

Answer 18

Heat

Question 19

In an exothermic reaction will the reactant or product have more energy?

Answer 19

Reactant

Question 20

Examples of exothermic reactions/ processes?

Answer 20

Combustion of fuels
Reaction of acids w. Metal
Neutralisation of acids w. Bases
Production of energy from electrochemical cells

Question 21

What is endothermic?

Answer 21

Reaction/process which absorbs energy

Question 22

In an endothermic reaction/process, will the reactant or product have more energy?

Answer 22

Product

Question 23

Examples of endothermic reactions/processes

Answer 23

Thermal decomposition of carbohydrates
Electrolysis
First stages of photosynthesis

Question 24

What do energy level diagrams show?

Answer 24

Energy change of reaction in reactants to products

Question 25

On an energy level diagram what do the x and y axis show?

Answer 25

``` X= reactants and products Y= energy change of reaction ```

Question 26

What type of energy is given out and absorbed in endo/exothermic reactions

Answer 26

Heat

Question 27

Do exothermic reactions have positive or negative reactant values?

Answer 27

Negative

Question 28

Do endothermic reactions have positive or negative reaction values?

Answer 28

Positive

Question 29

On an endothermic energy level diagram which way is the arrow pointing?

Answer 29

Up

Question 30

Is breaking bonds endo or exo?

Answer 30

Endothermic

Question 31

Is making bonds making endo or exo

Answer 31

Exothermic

Question 32

Define fuel

Answer 32

Any substance that releases energy when burned

Question 33

Advantages of using hydrogen as a fuel

Answer 33

Doesn't pollute | Releases more energy per kilo gram than other fuels

Question 34

Disadvantages of using hydrogen as a fuel

Answer 34

Expensive | Difficult to store

Question 35

What type of energy do nuclear power stations use?

Answer 35

Heat