Enthaply Change Defintions

Question 1

How do use calculate enthaply change of combustion

Answer 1

Reactants - products

Question 2

How do u calculate enthaply change of formation

Answer 2

Products - reactants

Question 3

What is enthaply change of formation

Answer 3

Enthaply change when one mole of a compound is formed form its elements with all substances in their standard states

Question 4

What’s enthaply change of combustion

Answer 4

Enthaply change one one mole of a compound is burnt completely in oxygen under standard conditions and all reactants and products being in their standard states

Question 5

What is bond dissociation enthaply

Answer 5

This is the change in enthaply that is required to break a covalent bond with all species being in a gaseous state

Question 6

What’s mean bond enthaply

Answer 6

The average value of bond energy needed to break a given type of bond over a range of compounds

Question 7

How do u work out bond enthalpies

Answer 7

Bonds broken- bonds forms

Question 8

Give examples of exothermic reactions

Answer 8

They give out energy,and energy is released as bond are formed

Oxidation
Combustion

Question 9

What are endothermic reactions are give examples

Answer 9

They absorbed energy,bonds are broken

Thermal decomposition
Photosynthesis