Energetics

Question 0

Bond breaking

Answer 0

Exothermic

Question 1

Exothermic reactions

Answer 1

Reactions which give out heat energy (delta h= negative)

Question 2

Definition of exothermic

Answer 2

More energy is need to break the bonds than form them

Question 3

Endothermic

Answer 3

Reactions which take in energy from the surroundings (delta h= positive)

Question 4

Bond making

Answer 4

Endothermic

Question 5

Endothermic definition

Answer 5

More energy needed to make bonds than break them

Question 6

Energy level diagrams for Exothermic reactions

Answer 6

The reactants are higher than the products

Question 7

Energy level diagrams for endothermic reactions

Answer 7

Products are higher than the reactants

Question 8

Calculating energy released

Answer 8

Mass x specific heat x temperature increase

Question 9

Calculating energy per gram

Answer 9

Energy released/mass of fuel used

Question 10

In an endothermic reaction have the chemicals gained or lost energy

Answer 10

Gained

Question 11

In an exothermic reaction have the chemicals gained or lost energy

Answer 11

Lost

Question 12

Example of an endothermic reaction

Answer 12

Dissolving salts in water

Question 13

^H

Answer 13

Change in energy

Question 14

H is the symbol for

Answer 14

Enthalpy

Question 15

Atomic bond

Answer 15

Two atoms bonded by their electrostatic force

Question 16

When heated most chemicals

Answer 16

Decompose

Question 17

Equation linking heat given out, mass, specific heat capacity and temperature change

Answer 17

Q=mc^T