GCSE Chemistry - Alkanes: properties & combustion #52

The video tutorial covers the properties and combustion of alkanes, a homologous series of hydrocarbons. It explains how the length of the carbon chain affects properties like boiling point, volatility, and flammability. The tutorial also details the process of combustion, highlighting its exothermic nature and the importance of balancing chemical equations. Key examples include the combustion of propane and nonane, demonstrating how to write and balance these reactions. The video emphasizes the role of hydrocarbons as fuels and the conditions required for complete combustion.

Which property of alkanes increases as the carbon chain lengthens?

• Color

• Volatility

• Boiling point

• Flammability

What is the main reason shorter alkanes are more flammable?

• They are more viscous.

• They have a higher boiling point.

• They have more carbon atoms.

• They evaporate more easily.

What are the products of complete combustion of hydrocarbons?

• Carbon dioxide and water

• Methane and water

• Carbon monoxide and water

• Hydrogen and oxygen

In the complete combustion of propane, how many water molecules are formed?

• Two

• Three

• Five

• Four

How many oxygen molecules are needed for the complete combustion of propane?

• Five

• Six

• Four

• Three

For the combustion of nonane, how many carbon dioxide molecules are produced?

• Ten

• Nine

• Eight

• Seven

What is the total number of oxygen atoms required for the complete combustion of nonane?

• Twenty-six

• Twenty-four

• Thirty

• Twenty-eight