Different car engines are designed to use different fuels - Edexcel - GCSE Chemistry - Question 4 - 2012 - Paper 1

To show that carbon dioxide is produced, you can follow these steps:

1. Bubble or pass the gas produced from burning propane through limewater.
2. Observe the reaction: limewater will turn milky or cloudy, indicating the formation of calcium carbonate precipitate due to the presence of carbon dioxide.

Incomplete combustion of propane can lead to the formation of carbon monoxide, which is a toxic and poisonous gas. This gas can interfere with the ability of blood to carry oxygen, creating a suffocation hazard for humans and wildlife. Additionally, it contributes to air pollution and can form soot, which can damage health and the environment.

The answer is:

• A ethanol X
• B hydrogen
• C LPG
• D petrol

Ethanol can be produced as a biofuel.

Biofuels are derived from renewable biological materials, such as plant matter or animal waste, making them more sustainable. In contrast, fossil fuels are formed from ancient organic materials that have been subjected to heat and pressure over millions of years, leading to a finite supply. Biofuels can potentially reduce greenhouse gas emissions compared to fossil fuels.

Fuel A, which is a gas with a high energy content (142 MJ) compared to Fuel B (47 MJ), would be best for powering a car, despite its limited availability. The high energy output of Fuel A makes it more efficient, providing better performance for vehicles.