DF Flashcards
Is bond making/breaking endothermic or exothermic?
Breaking - endothermic
Making - exothermic
What is standard enthalpy change of neutralisation?
1 mol of H+ reacts with 1 mol OH- to form 1 mol of H2O
1moldm-3 conc
What is a homologous series?
Compounds that differ by -CH2
Why would temperature change be inaccurate for endothermic processes?
Heat taken in
Why do diesels produce less hydrocarbons?
Less volatile / higher bp
Why could enthalpy change of combustion be different to a book value?
Bond enthalpy is an average
Not in standard states
What is enthalpy change of combustion?
1 mole completely burned in oxygen
What is enthalpy of formation?
1 mole of compound formed from its elements
Which way do the arrows go on a
Formation cycle
Combustion cycle?
Outwards
Inwards (to CO2 + H2O)
Chain isomer
Different arrangement of carbon skeleton (branching)
Positional isomer
Different position of functional group
Functional group isomer
Different functional group
Conditions + product of hydrating alkenes
300c
60 atm
Steam + acid catalyst
Alcohol
What causes photochemical smog?
Unburnt HC (C) and NOx
What causes acid rain?
SO2
NOx