Giant Ionic Compounds: Giant ionic compounds have strong ionic bonds- electrostatic attractions between oppositely- charged ions. Must overcome to melt. Lattice Enthalpy: Lattice enthalpy is the enthalpy change that accompanies formation of one mole of an ionic...
Factors Affecting Lattice Enthalpy: Add up ionic radius/ charge if given a range of elements and compounds. When ions in two different groups, need to talk about both ionic charge and ionic size e.g. Mg2+ and Na+. Don’t write Na, write Na+. Don’t forget the...
Factors Affecting Hydration Enthalpies: Hydration enthalpies affected by ionic size and ionic charge in same way as lattice enthalpy. Effect of Ionic Size: Ionic size increase down a group. - MN+ is has a smaller ionic radius than Y+. - Attraction between ion and...
Entropy: The greater the entropy, the greater the disorder. Units of entropy are JK-1mol-1 . 0K = no energy so minimum disorder. States of Matter: Generally changing from solids -> liquids -> gas by melting and boiling, increases entropy increase in disorder,...
Feasibility: Reaction can only occur if products have lower overall energy than reactants, then feasible or spontaneous. Gibbs’ Equation: The overall change during chemical reaction called free energy change- ∆G. Enthalpy change refers to heat transfer between...