Energy Changes

Question 1

Describe an exothermic reaction

Answer 1

When energy is lost as heat into the surrounding/dissipated into the surroundings

Question 2

An example of an Exothermic Reaction would be:

Answer 2

• Combustion - Fuels
• Oxidation
• Neutralizing

Question 3

What is an endothermic reaction?

Answer 3

A reaction that requires energy to begin, heat is applied to supply this energy. Eg. Bunsen Burner

Question 4

What is activation energy?

Answer 4

The minimum energy required for the reactant particles to begin colliding and reacting

Question 5

An endothermic reaction example would be:

Answer 5

• Melting

Question 6

What are bond energies?

Answer 6

The amount of energy to break a mole of a covalent bond

Question 7

How many bonds is 1mol

Answer 7

6.02x10^23

Question 8

Breaking bonds is a ____________ Reaction

Answer 8

Endothermic because it requires energy

Question 9

Forming Bonds is a ____________ Reaction

Answer 9

Exothermic reaction because it releases energy

Question 10

How do we find if a overall reaction is endothermic or exothermic?

Answer 10

Find the difference in energy of the reactants and the products

Question 11

If the result of a breaking bonds calculation is negative, is the reaction endothermic or exothermic?

Answer 11

Exothermic, Energy is lost into the atmosphere when making the products

Question 12

View the Notes on Bond energies to see examples

Question 13

If the energy of the reactants is less than that of the products, the reaction is ____________

Answer 13

endothermic

Question 14

If the energy of the reactants is greater than that of the products, the reaction is ____________

Answer 14

Exothermic, going dooooooown, dissipating heat

Question 15

What is a fuel cell?

Answer 15

An electrical cell supplied with fuel and oxygen, that uses energy from the reaction to produce electricity.

Question 19

What are the electrodes in fuel cells made from?

Answer 19

Porous carbon.