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

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

MCQ

CH15 - HYDROCARBONS

The presence of 11-cis retinal, $C_{20}H_{28}O$, in cells in the eye is important for vision.The structure of retinal includes an aldehyde group, a cy...

2009 Winter

MCQ

CH15 - HYDROCARBONS

What is the least number of carbon atoms in a non-cyclic alkane molecule that has a chiral centre?

2009 Winter

MCQ

CH15 - HYDROCARBONS

Bromine reacts with ethene to form 1,2-dibromoethane. What is the correct description of the organic intermediate in this reaction?

2009 Winter

MCQ

CH15 - HYDROCARBONS

Which equation represents a valid propagation step in the free radical reaction between ethane and chlorine?

2009 Winter

Theory

CH15 - HYDROCARBONS

(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

CH15 - HYDROCARBONS

(a) All the carbon atoms in benzene lie in the same plane. This means that they are coplanar, but this is not the case with cyclohexane.By rotating th...

2009 Winter

MCQ

CH15 - HYDROCARBONS

When gaseous chemicals are transported by road or by rail they are classified as follows.flammable        &nbs...

2010 Summer

MCQ

CH15 - HYDROCARBONS

When heated with chlorine, the hydrocarbon 2,2-dimethylbutane undergoes free radical substitution.In a propagation step the free radical $X^\cdot$ is ...

2010 Summer

Theory

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

Some intercontinental jet airliners use kerosene as fuel. The formula of kerosene may be taken as $C_{14}H_{30}$.(a) To which homologous series of com...

2011 Summer

Theory

CH15 - HYDROCARBONS

(a) (i) What is meant by the term `cracking` and why is it carried out?..................................................................................

2011 Summer

Theory

CH10 - GROUP 2

(a) State the formula of each of the calcium compounds U to Y.   U V W X Y (b) Compound Y may be converted into compound V. Out...

2011 Summer

Theory

CH18 - CARBONYL COMPOUNDS

Ketones are widely used as solvents and as intermediates in the chemical industry.Ketones contain the reactive keto group, $\text{C=O}$.(a) Propanone,...

2011 Summer

Theory

CH5 - CHEMICAL ENERGETICS

(a) When calcium carbide is reacted with water, ethyne and calcium hydroxide are formed. Construct a balanced equation for this reaction. (b) (i) Wh...

2011 Summer

Theory

CH7 - EQUILIBRIA

Ethanoic acid can be reacted with alcohols to form esters, an equilibrium mixture being formed.$$\text{CH}_3\text{CO}_2\text{H} + \text{ROH} \rightlef...

2011 Summer

Theory

CH16 - HALOGEN DERIVATIVES

(a) Use relevant bond energies from the Data Booklet, and the equation below to calculate a value for the bond energy of the C–F bond.CH$_2$ = CH$_2...

2011 Summer

Theory

CH10 - GROUP 2

(a) State the formula of each of the barium compounds R to W.R .................................... S ....................................T .............

2011 Summer

Theory

CH6 - ELECTROCHEMISTRY

(a) (i) Describe, with the aid of a fully labelled diagram, the industrial electrolysis of brine in a diaphragm cell. State what each electrode is mad...

2011 Summer

Theory

CH19 - CARBOXYLIC ACIDS AND DERIVATIVES

Although there are many different types of food eaten around the world, animal fats and/or vegetable oils are commonly used in cooking.Animal fats and...

2011 Summer