chemistry last minute cram

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How does the boiling point change as the number of carbon atoms in hydrocarbons increases?

The more C atoms the higher the bpt/temperature

When ethane (C4H6) burns in a plentiful supply of air, carbon dioxide and water are formed. Give a chemical equation for this reaction. (2)

2C₄H₆ + 7O₂ -> 4CO₂ + 6H₂O

When air supply is limited, incomplete combustion occurs. Explain why a gas formed by incomplete combustion can cause a problem for humans. (2)

Carbon monoxide is the gas produced

It limits the capacity of haemoglobin to carry oxygen

Natural gas is a good fuel because… (1)

It produces no waste gases on complete combustion

What is a homologous series? (2)

Family of organic compounds with similar features and chemical properties due to having the same functional group.

State two characteristics, other than having the same general formula, of members of a homologous series. (2)

Any two from:

Same/similar chemical properties

Trend in physical properties

Same functional group

Explain why graphite can 1) conduct electricity 2) is soft and slippery

Each carbon forms 3 bonds

For each carbon there is 1 delocalised electron

Mobile electrons can carry charge through the structure

Graphite is composed of lots of layers of graphene

Weak intermolecular forces between each layer

Layers easily slide over each other.

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