enthalpy change

Question 1

standard conditions

Answer 1

100kpa

298K

Question 2

Where is the activation energy drawn from

Answer 2

Reactants to the product

Question 3

Endothermic

Answer 3

Reactions that absorb energy from surroundings
product higher in energy than reactants
Bonds broken

Question 4

Standard enthalpy change of reaction

Answer 4

Enthalpy change of a reaction according to the molar quantities in the equation under standard conditions with all reactants and products in their standard state

Question 5

Standard enthalpy change of neutralisation

Answer 5

Enthalpy change when an acid and an alkali react to form 1 mole of water under standard conditions.

Question 6

Standard enthalpy change of formation

Answer 6

Enthalpy change when 1 mole of a compound is formed from its element under standard conditions

Question 7

Standard enthalpy change of combustion

Answer 7

Enthalpy change when 1 mole of a substance is completely burned in oxygen to make co2 and h20 in standard conditions.

Question 8

Bond disassociation

Answer 8

Energy needed per mole to break attractive forces in bonds

Question 9

What is calorimetry used for

Answer 9

Work out the enthalpy change in combustion

Question 10

What is hesse’s law

Answer 10

The total enthalpy change of a reaction is independent of the route taken

Question 11

Average bond enthalpy meaning

Answer 11

the energy needed to break one mole of a bond in a gaseous molecule

Question 12

Are bond enthalpies always endo or exo

Answer 12

endo

Question 13

What kind of structure do you work average bond enthalpy on

Answer 13

gaseous covalent molecules

Question 14

Average bond enthalpy equation

Answer 14

bond enthalpy in reactants - in products