## Geometrical Isomerism

How many geometrical isomers are there of hex-2,4-diene, CH3CH=CHCH=CHCH3?

## Change Of State

Describe what happens to the temperature when a change of state from liquid to gas is taking place. Explain.

## Purity Analysis

What method(s) of analysis do we use to determine the purity of the substance?

## Hydrolysis of Halogenoalkanes

The hydrolysis of 1-chloropropane to produce propan-1-ol is much slower corresponding to hydrolysis of 1-iodopropane. Explain this observation.

## Solid Liquid & Gas

Describe the differences, in terms of the motion and arrangement between solid, liquid and gaseous particles.

## Kc

The equilibrium constant for the reaction H2(g) + I2(g) <-> 2HI(g) is 60 at 723K. What is the number of moles of HI in equilibrium with 2 mol of H2 and 0.3 mol of I2 at 723K?

## Rusting

At room temperature iron will rust in moist air.

Describe and explain how galvanizing iron prevents rusting.

## Boiling Points

Describe and explain the variation in boiling point of the gases Hydrogen Fluoride, Hydrogen Chloride, Hydrogen Bromide and Hydrogen Iodide.

## Experimental Chemistry

In general, how do we know which methods (Crystalisation or Evaporation to dryness) to obtain the pure crystal of a salt?

## Bond Energy

Water gas, a mixture of Carbon Monoxide and Hydrogen, is prepared by passing Steam over heated Carbon. Energy is absorbed during the process.

i) Is the process Endothermic or Exothermic?
ii) Construct a balanced equation for this reaction.
iii) Calculate the Enthalpy Change of reaction given that
C≡O 1072 kJ/mol
H-H 432 kJ/mol
O-H 467 kJ/mol