Enthalpy Change

what is enthalpy change?

the heat energy transferred in a reaction at a constant pressure. KJ mol^-1

what are the standard conditions?

298 K/25 C. pressure of 1 bar/100 kPa. solutions 1 mol dm^-3

what is bond breaking?

endothermic so /\H is +

what is bond making?

exothermic so /\H is -

what is average bond enthalpy?

the energy needed to break one mole of bonds in the gas phase

what is the conversion from C to K

C + 273.15

what is standard enthalpy change of a reaction?

enthalpy change when reactions occur under standard conditions in the molar quantities in the reaction

what is the standard enthalpy change of formation?

enthalpy change when 1 mole of compound is formed from elements is standard states and conditions

what is the standard enthalpy change of combustion?

enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions.

what is the specific heat capacity equation?

q = mc/\T

what is /\T?

temperature change (C or K)

what is q?

heat lost or gained (joules)

what is m?

the mass of water - unless told otherwise (g)

what is c?

SHC of water aka 4.18 - unless told otherwise (J g^-1 K^-1)

what is standard enthalpy change of neutralization?

enthalpy change when 1 mol oh H+ react with 1 mol OH- to form 1 mol H2O in standard conditions with a conc of 1 mol dm-3