enthalpy changes

Question 1

standard conditions

Answer 1

298k, 1 atm, 100kpa, standard states

Question 2

enthalpy change of different chemical reactions

Answer 2

exothermic = energy taken out = temeprature increases = enthalpy decreases visa versa for endo

Question 3

on an enthalpy profile where is the activation energy and enthalpy change for a endothermic reaction

Answer 3

activation energy is the energy requried (the peak) to get from reactants to products. enthalpy change is the energy change straight from reactants to products

Question 4

enthapy change formation

Answer 4

energy change when 1 mole of substance is formed from elements under standard conditions in its standard states

Question 5

enthalpy change combustion

Answer 5

enthalpy change when 1 mole of a substance is completly burnt in oxygen under standard states

Question 6

enthalpy change of neutralisation

Answer 6

enthalpy change when acid and base react to form one mole of water under standard states

Question 7

enthalpy change formula

Answer 7

bonds broken (reactants) - bonds formed (products)

Question 8

unit for q in q=mcchanget

Answer 8

joules

Question 9

average bond enthalpy

Answer 9

energy required to break one mole of covalent bonds in gaseous atoms.