AQA GCSE Chem Organic Chemistry MCQs FT+HT

Which of these is a finite resource?

• biofuel

• cotton

• crude oil

• wood

What name is given to molecules which contain only carbon and hydrogen atoms?

• carbohydrates

• carbonhydrogenates

• hydrocarbons

• hydrogencarbonates

What is the general formula for an alkane?

• 
• 
• 
• 

Why can fractional distillation be used to separate crude oil?

• crude oil does not burn

• crude oil only contains a small number of hydrocarbons

• each fraction has a different boiling point

• some hydrocarbons in crude oil are solids

What is the trend in the boiling point of hydrocarbons as the size of the hydrocarbon molecule increases?

• the boiling point decreases

• the boiling point increases

• the boiling point stays the same

• there is no clear relationship between the boiling point and the size of the molecule

What are the products of the complete combustion of methane?

• carbon dioxide and hydrogen

• carbon dioxide and oxygen

• carbon dioxide and water

• carbon dioxide only

Which useful products are made from chemicals extracted from crude oil?

• lubricants

• polymers

• solvents

• all the above

What is the name of the process by which large hydrocarbon molecules are broken down into smaller hydrocarbon molecules?

• combustion

• cracking

• fractional distillation

• reduction

Which reagent is used to test for the presence of alkenes?

• Benedict’s reagent

• bromine water

• iodine

• universal indicator

What colour change is observed in the test for an alkene?

• blue to red

• brown to black

• green to red

• orange to colourless