Energetics, Group Chemistry, Halogenoalkanes and Alcohols

WCH12Unit 25 topics · 15 questions

Key equations

The relationships this unit leans on most. Check your formulae or data booklet for which ones the exam gives you.

$Q = mc\Delta T$: energy transferred; $m$ is the mass of the solution or water heated
$Δ H = - \frac{}{}$

2.4Introduction to kinetics and equilibria3 questions

Δ H = - \frac{Q}{n}

per mole of the limiting reactant; negative when the mixture warms

$\Delta_r H = \sum \Delta_f H(\text{products}) - \sum \Delta_f H(\text{reactants})$

Hess's law with enthalpies of formation

$\Delta H = \sum(\text{bonds broken}) - \sum(\text{bonds made})$

estimate from mean bond enthalpies

$\text{rate} = \dfrac{\Delta[\text{X}]}{\Delta t}$: change in concentration over time