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

MCQ

CH3 - CHEMICAL BONDING

Which molecule contains six bonding electrons?

2017 Summer

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

The mass spectrum of a sample of lithium shows that it contains two isotopes, $^6\text{Li}$ and $^7\text{Li}$.The isotopic abundances are shown in the...

2017 Summer

MCQ

CH1 - ATOMS, MOLECULES & STOICHIOMETRY

A sports medal has a total surface area of 150 cm$^2$. It was evenly coated with silver by electrolysis. Its mass increased by 0.216 g.How many atoms ...

2017 Summer

MCQ

CH2 - ATOMIC STRUCTURE

Which property of an atom does not affect its first ionisation energy?

2017 Summer

MCQ

CH3 - CHEMICAL BONDING

Which molecule has the largest overall dipole?

2017 Summer

MCQ

CH4 - STATES OF MATTER

The complete combustion of 2 moles of a straight chain alkane produces 400 dm^3 of carbon dioxide measured at 301 K and 1 \times 10^5 Pa. Carbon dioxi...

2017 Summer

MCQ

CH5 - CHEMICAL ENERGETICS

Which expression gives the standard enthalpy change of combustion of methane?

2017 Summer

MCQ

CH6 - ELECTROCHEMISTRY

Solutions containing chlorate(I) ions are used as household bleaches and disinfectants. These solutions decompose on heating as shown. $$3ClO^- \righ...

2017 Summer

MCQ

CH6 - ELECTROCHEMISTRY

When $K_2MnO_4$ is dissolved in water, the following reaction occurs:$aMnO_4^{2-}(aq) + bH_2O(l) \rightarrow cMnO_4^{-}(aq) + dMnO_2(s) + eOH^{-}(aq)$...

2017 Summer

MCQ

CH7 - EQUILIBRIA

Methanol can be produced from hydrogen and carbon monoxide.$2H_2(g) + CO(g) \rightleftharpoons CH_3OH(g)$What is the expression for $K_p$ for this rea...

2017 Summer