3a. Energetics

Question 1

Exothermic reaction:

Answer 1

Chemical reaction in which heat energy is given out

Question 2

Endothermic:

Answer 2

CHemical reaction in which heat energy is taken in

Question 3

What is calorimetry?

Answer 3

The measurement of the amount of energy transfered in a chemical reaction

Question 4

Heat energy (Q) =

Answer 4

Q = mcΔT

Question 5

Molar enthalpy (ΔH), in KJ/mol =

Answer 5

amount of energy transferred (Q) in KJ / number of moles (n), in mol

Question 6

What comes before in a reaction, rectants or products?

Answer 6

Reactants

Question 7

Bond-breaking is ? process

Answer 7

Endothermic, energy is taken in to break the bonds so it is endothermic

Question 8

Bond-making is ? process

Answer 8

Exothermic, when making bonds energy is released so it is exothermic

Question 9

Enthalpy change (ΔH)

Answer 9

Enthalpy change, ΔH = Energy needed to break all the bonds - Energy released to make all the new bonds

Question 10

When the final result in an enthalpy change is a positive number, we say it was a?

Answer 10

Endothermic reaction