MCQ

CH5 - CHEMICAL ENERGETICS

The first stage in the industrial production of nitric acid from ammonia can be represented by the following equation.4NH$_3$(g) + 5O$_2$(g) ⇌ 4NO(g...

2009 Winter

Theory

CH5 - CHEMICAL ENERGETICS

(a) (i) Use the data to calculate $\Delta H^\circ_{\text{reaction}}$ for the formation of CH$_3$Cl. CH$_4$ + Cl$_2$ $\rightarrow$ CH$_3$Cl + HCl (...

2009 Winter

Theory

CH5 - CHEMICAL ENERGETICS

(a) Show by means of an equation what is meant by the lattice energy of calcium chloride.................................................................

2009 Winter

Theory

CH5 - CHEMICAL ENERGETICS

(a) Describe and explain qualitatively the trend in the solubilities of the sulfates of the Group II elements. (b) The major ore of barium is barytes...

2009 Winter

Theory

CH5 - CHEMICAL ENERGETICS

(a) What is meant by the term bond energy ?    (b) Describe and explain what is observed when a red-hot wire is plunged into separate sampl...

2009 Winter

MCQ

CH5 - CHEMICAL ENERGETICS

Some bond energy values are listed below. [Table_1: ] These bond energy values relate to the following four reactions. P Br_2 \rightarrow 2Br Q ...

2010 Summer

MCQ

CH5 - CHEMICAL ENERGETICS

Given the following enthalpy changes,$I_2(g) + 3Cl_2(g) \rightarrow 2ICl_3(s) \quad \Delta H^\circ = -214 \text{ kJ mol}^{-1}$$I_2(s) \rightarrow I_2(...

2010 Summer

MCQ

CH5 - CHEMICAL ENERGETICS

Some bond energy values are listed below.[Table_1]These bond energy values relate to the following four reactions.P \( \text{Br}_2 \rightarrow 2\text{...

2010 Summer

MCQ

CH5 - CHEMICAL ENERGETICS

Given the following enthalpy changes,$$I_2(g) + 3Cl_2(g) \rightarrow 2ICl_3(s) \quad \Delta H^\circ = -214 \text{ kJ mol}^{-1}$$$$I_2(s) \rightarrow I...

2010 Summer

Theory

CH5 - CHEMICAL ENERGETICS

Hydrazine, N$_2$H$_4$, can be used as a rocket fuel and is stored as a liquid. It reacts exothermically with oxygen to give only gaseous products. Th...

2010 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Copper and titanium are each used with aluminium to make alloys which are light, strong and resistant to corrosion. Aluminium, $Al$, is in the third p...

2009 Summer

Theory

CH10 - GROUP 2

Magnesium will react on heating with chlorine, or oxygen, or nitrogen to give the chloride, or oxide, or nitride respectively. Each of these compounds...

2009 Summer

Theory

CH15 - HYDROCARBONS

Concern over the ever-increasing use of fossil fuels has led to many suggestions for alternative sources of energy. One of these, suggested by Profess...

2009 Summer

Theory

CH22 - ANALYTICAL TECHNIQUES

(a) Complete the following reaction scheme which starts with ethanol.In each empty box, write the structural formula of the organic compound that woul...

2009 Summer

Theory

CH22 - ANALYTICAL TECHNIQUES

(a) When F is formed in step I no other compound is produced. Suggest a structural formula for F, which contains one –OH group.(b) Compound G has tw...

2009 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

(a) Complete the electronic configuration of aluminium and of titanium, proton number 22.\[\begin{array}{|c|c|} \hline \text{Al} & 1s^2 \\ \hline \tex...

2009 Summer

Theory

CH10 - GROUP 2

(a) (i) Write an equation, with state symbols, for the second ionisation energy of calcium...............................................................

2009 Summer

Theory

CH15 - HYDROCARBONS

Concern over the ever-increasing use of fossil fuels has led to many suggestions for alternative sources of energy. One of these, suggested by Profess...

2009 Summer

Theory

CH22 - ANALYTICAL TECHNIQUES

(a) Complete the following reaction scheme which starts with propanone. In each empty box, write the structural formula of the organic compound that w...

2009 Summer

Theory

CH22 - ANALYTICAL TECHNIQUES

Ethanol, CH$_3$CHO, can be converted into compound U by the following sequence.(a) When T is formed in step I, no other compound is produced.Suggest a...

2009 Summer