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

CH3 - CHEMICAL BONDING

The Pauling electronegativity values of elements can be used to predict the chemical properties of compounds.Use the information in Table 1.1 to answe...

2023 Spring

Theory

CH10 - GROUP 2

The Group 2 elements Mg to Ba are all silvery-white reactive metals.(a) (i) Draw a labelled diagram to show the bonding and structure of the Group 2 m...

2023 Spring

Theory

CH15 - HYDROCARBONS

(a) (i) Define addition reaction.........................................................................................................................

2023 Spring

Theory

CH16 - HALOGEN DERIVATIVES

(a) (i) State the reagent and conditions used to form E in reaction 1....................................................................................

2023 Spring

Theory

CH2 - ATOMIC STRUCTURE

(a) The most common zinc mineral contains zinc(II) sulfide, ZnS.(i) Complete the electrons in boxes diagram in Fig. 1.1 to show the electronic configu...

2023 Spring

Theory

CH6 - ELECTROCHEMISTRY

Hypophosphorous acid is an inorganic acid.The conjugate base of hypophosphorous acid is $\text{H}_2\text{PO}_2^-$.(a) Give the formula of hypophosphor...

2023 Spring

Theory

CH12 - AN INTRODUCTION TO THE CHEMISTRY OF TRANSITION ELEMENTS

Vanadium is a transition element in Period 4 of the Periodic Table.(a) Define transition element.........................................................

2023 Spring

Theory

CH20 - NITROGEN COMPOUNDS

Ethylamine and phenylamine are primary amines.Fig. 4.1These two compounds are synthesised by different methods.(a) Several methods can be used to form...

2023 Spring

Theory

CH14 - AN INTRODUCTION TO ORGANIC CHEMISTRY

(a) Tulobuterol contains a benzene ring in its structure.Describe and explain the shape of benzene.In your answer, include:• the bond angle between ...

2023 Spring

Theory

CH22 - ANALYTICAL TECHNIQUES

(a) (i) Suggest a compound that could be used as the stationary phase in this experiment.................................................................

2023 Spring