GCSE Chemistry - Alkanes: properties & combustion #52

The video discusses alkanes, a type of hydrocarbon, focusing on their properties and combustion reactions. Alkanes have varying boiling points, volatility, and flammability based on their carbon chain length. Shorter alkanes are more volatile and flammable, making them effective fuels. The video explains combustion reactions, highlighting complete combustion, which produces carbon dioxide and water, releasing energy. It also covers balancing combustion equations using examples like propane and nonane. The key takeaway is that alkanes' properties depend on chain length, affecting their use as fuels.

What happens to the boiling point of alkanes as the carbon chain length increases?

• It decreases.

• It fluctuates randomly.

• It remains constant.

• It increases.

Which property of shorter alkanes makes them more suitable as fuels?

• Higher flammability

• Lower density

• Lower volatility

• Higher viscosity

What is produced during the complete combustion of hydrocarbons?

• Carbon monoxide and water

• Carbon dioxide and water

• Oxygen and hydrogen

• Methane and water

In a balanced equation for the combustion of propane, how many CO2 molecules are formed?

• Five

• Four

• Three

• Two

How many water molecules are produced in the complete combustion of propane?

• Two

• Three

• Four

• Five

For the combustion of nonane, how many oxygen molecules are required to balance the equation?

• 12

• 14

• 18

• 16

What is a key takeaway about the properties of alkanes?

• Longer alkanes are more volatile.

• All alkanes are solid at room temperature.

• Shorter alkanes have higher boiling points.

• Shorter alkanes are more flammable.