Chemical Energetics | 6

Question 1

Petroleum

Answer 1

Mixture of hydrocarbons

Question 2

Hydrocarbons

Answer 2

Compounds of hydrogen and carbon

Question 3

Fossil fuels

Answer 3

Formed rom dead plants and animals fossilized under high pressure

Release energy in the form of heat

Non - renewable

Question 4

Name renewable energy sources

Answer 4

Nuclear

Wind

Hydroelectric

Solar

Wave

Question 5

Exothermic reaction

Answer 5

Transfers thermal energy io its surroundings

Increases in the temprature of the surroundings

Energy is transferred to surroundings

Bond making (Products have less energy)

Question 6

Exothermic reaction example

Answer 6

Combustion , Respiration

Question 7

Enthalpy change

Answer 7

Transfer of thermal energy during a reaction

The Difference in energy between the reactants and products

Question 8

Endothermic Reaction

Answer 8

Transfers thermal energy from surroundings to itself

Leads to decrease in surrounding temprature

Bond breaking (products have more energy)

Question 9

Endothermic reaction example

Answer 9

Freezing , condensation

Question 10

Activation energy

Answer 10

Minimum energy that colliding particles must have in order to react