AQA (9-1) Topic 7

1

Identify the missing reactants/products for complete and incomplete combustion:

❌ combustion:
fuel + oxygen → carbon dioxide + ❌

❌ combustion:
fuel + ❌ → ❌ and water

water

hydrogen

oxygen

carbon

air

Complete

Incomplete

carbon monoxide

carbon dioxide

1

Which of the following is not a hydrocarbon?

1

( Fractional distillation, Distillation, Crystallisation ) is the process of separating crude oil into its different compounds. Crude oil is a ( mixture, compound, selection ) of ( compounds, mixtures ), and is pretty useless by itself.

1. Crude oil is ( heated, cooled ) as it enters the fractionating column.
2. The crude oil is evaporated/vaporised, and begins to ( rise, sink ).
3. The top of the column is ( cooler, hotter ) than the bottom.
4. As the gases rise they begin to condense as they reach their ( boiling, melting ) point.
5. The different molecules will condense into ( fractions, halves, quarters ) of molecules with similar boiling points.
6. The ( longer, shorter ) the hydrocarbon chain, the higher the boiling point - so will collect near the bottom of the column. 

1

Four unknown alkanes had their viscosities compared, and they are listed below. Pick the chemical that would be described as the "thickest" liquid, or the one that flows most slowly. (The higher the number, the greater the viscosity)

1

A hydrocarbon is a molecule that contains only hydrogen and carbon atoms. Alkanes and alkenes are two homologous series of hydrocarbons. Select below which compounds are ALKANES.

1

The test for alkenes is to add bromine water to an alkene, and it will turn from an orange colour to colourless.

1

Which of the following is not something chemicals in a homologous series have in common:

1

Because alkanes only contain bonds between atoms, we describe them as saturated compounds.

1

Cracking involves the breaking down of larger, ❌ hydrocarbon molecules (❌) into smaller, more useful ones: an shorter saturated ❌, and ❌ alkene.

saturated

unsaturated

alkanes

alkenes

alkane

alkene

an unsaturated

a saturated

1

The process of cracking is a thermal decomposition.

1

Select all the ways below that hydrocarbons can be cracked.

1

❌ is used in domestic heating and cooking
❌ is used to surface roads and roofs
❌ is used as fuel for aircraft
❌ is used as fuel for cars
❌ is used as fuel for large ships and power stations
❌ is used as fuel for some cars and trains

gas

bitumen

kerosene

petrol (gasoline)

fuel oil

diesel oil

GCSE (AQA) Chemistry Test sobre AQA (9-1) Topic 7, creado por https:// revisechemistry.uk el 03/03/2018.