Definitions and Equations

Question 1

what are the standard conditions

Answer 1

100Kpa

298 K

Question 2

exothermic

Answer 2

gives energy out

delta negative - triangle H

Question 3

endothermic

Answer 3

absorbs energy

delta positive- triangle H

Question 4

bond making is

Answer 4

EXO

Question 5

bond breaking is

Answer 5

ENDO

Question 6

what is bond enthalphy

Answer 6

energy required to break bonds

Question 7

what is the enthalpy change equation( normal equation)

Answer 7

total energy absorbed- total energy released

BASICALLY reactants- products

Question 8

what is standard enthalpy of formation

Answer 8

the enthalpy change where 1 mole of a COMPOUND is formed from its elements in their standard states and under standard conditions

Question 9

what is standard enthalpy of combustion

Answer 9

the enthalpy change where 1 mole of a substance is completely burned in oxygen under standard conditions

Question 10

if its standard enthalpy of formation the arrows point

Answer 10

UP

• put the elements and the bottom

products- reactants

Question 11

if its standard enthalpy of combustion, the arrows point?

Answer 11

DOWN
crip
so
reactant- product

CO2+H2O

Question 12

what is Hesse’s law

Answer 12

the total enthalpy change of a reaction is INDEPENDENT of the route taken

Question 13

What is the enthalpy change of neutralisation?

Answer 13

Enthalpy change where an acid and alkali react to f

form one mole of water.