Describe and explain factors affecting the strength of metallic bonding

Explain why 2,2-dichloro-3-methylpentane is a structural isomer of 2,2-dichlorohexane

Explain, in terms of electronegativity, why the boiling point of H2S2 is lower than that of H2O2

What is electronegativity?

In the upper atmosphere it is more likely for CBrF3 to produce bromine atoms than it is for CClF3 to produce chlorine atoms. Suggest one reason for this

Bromotrifluromethane is formed when trifluromethane reacts with bromine
CHF3 + Br2 --> CBrF3 + HBr
This reaction is a free radical substitution similar to that of methane with chlorine
Write an equation for each of the following steps in the mechanism for the reaction of CHF3 with Br2
(i) initiation step
(ii) first propagation step
(iii) second propagation step
(iv) a termination step

State one condition necessary for the initiation of a free radical subsitution

State Le Chatelier's principle

Suggest why graphene is an excellent conductor of electricity

Predict the type of crystal structure of solid zinc fluoride and explain why its melting point is so high

What is an oxidising agent?

How can aqueous ammonia be used to distinguish between chloride, bromide and iodide ions?

State and explain the bond angle in the BF4- ion

State what is meant by the term activation energy

Explain why a catalyst has no effect on the position of equilibrium

Give two features of a reaction at equilibrium

Explain why barium is more reactive than calcium

Water forms hydrogen bonds which influences its properties. Explain what is meant by hydrogen bonding and explain two anomalous properties of water resulting from hydrogen bonding

Explain how Van der Waal's forces are formed

Why does electronegativity decrease down a group?

The boiling point of group 7 elements increases down the group. Explain this trend

What is ionisation energy

Why does electronegativity increase across a period?