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

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

Theory

CH22 - ANALYTICAL TECHNIQUES

A large number of organic compounds are soluble in both water and non-aqueous solvents such as hexane. If such a compound is shaken with a mixture of ...

2009 Summer

Theory

CH22 - ANALYTICAL TECHNIQUES

The structural formulae of six different compounds, A – F, are given below. Each compound contains four carbon atoms in its molecule.$$ \text{CH}_3\...

2009 Winter

Theory

CH22 - ANALYTICAL TECHNIQUES

Three organic compounds, G, H, and J, each have the empirical formula $CH_2O$. The numbers of carbon atoms in their molecules are shown in the table.[...

2009 Winter

Theory

CH22 - ANALYTICAL TECHNIQUES

(a) Complete the following reaction scheme which starts with 1-bromobutane. In each empty box, write the structural formula of the organic compound th...

2009 Winter

Theory

CH22 - ANALYTICAL TECHNIQUES

This question is about the modern techniques of analysis which may be used to determine molecular structures.(a) In X-ray crystallography X-rays are d...

2009 Winter

Theory

CH22 - ANALYTICAL TECHNIQUES

(a) Analysis of the bodies of birds of prey show that the pesticide residues accumulate in the fatty tissues of the birds. This is because of the high...

2009 Winter

MCQ

CH2 - ATOMIC STRUCTURE

What could be the proton number of an element that has three unpaired electrons in each of its atoms?

2010 Summer

MCQ

CH2 - ATOMIC STRUCTURE

Use of the Data Booklet is relevant to this question.The elements radon (Rn), francium (Fr) and radium (Ra) have consecutive proton numbers in the Per...

2010 Summer

MCQ

CH4 - STATES OF MATTER

Which gas closely approaches ideal behaviour at room temperature and pressure?

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 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

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Ammonium nitrate, NH$_4$NO$_3$, can decompose explosively when heated. NH$_4$NO$_3$ $\rightarrow$ N$_2$O + 2H$_2$O What are the changes in the oxidati...

2010 Summer

MCQ

CH20 - NITROGEN COMPOUNDS

The Haber process for the manufacture of ammonia is represented by the following equation. \( \text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\tex...

2010 Summer

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Use of the Data Booklet is relevant to this question. 2.920 g of a Group II metal, $X$, reacts with an excess of chlorine to form 5.287 g of a compou...

2010 Summer

MCQ

CH4 - STATES OF MATTER

Which mass of gas would occupy a volume of 3 dm$^3$ at 25°C and 1 atmosphere pressure? [1 mol of gas occupies 24 dm$^3$ at 25°C and 1 atmosphere pre...

2010 Summer

MCQ

CH7 - EQUILIBRIA

The table gives the concentrations and pH values of the aqueous solutions of two compounds, X and Y. Either compound could be an acid or a base.[Table...

2010 Summer