GCSE|Edexcel| Chemistry P2H (Nov 2021)

Reorder the following in increasing order of particle size.

• nanoparticle

• ethene molecule

• starch molecule

• sodium atom

Explain a possible risk associated with nanoparticulate materials.

Explain the advantage of using catalysts made of nanoparticles rather than larger particles.

Explain how Figure 2 shows that dissolving ammonium chloride in water is an endothermic process.

Complete the reaction profile in Figure 2 and label the activation energy.

Diesel oil is a mixture of hydrocarbons that can be obtained from crude oil.

State the name of the process used to separate diesel oil from crude oil.

Diesel oil contains alkanes. These alkanes are part of an homologous series.

Which statement about compounds in this homologous series is true?

• they have the same chemical formula

• they have the same empirical formula

• they have the same general formula

• they have the same general formula

When fuels such as diesel oil are burned, the high temperatures produced can cause nitrogen and oxygen in the air to form the pollutant nitrogen dioxide.

Complete the balanced equation for the reaction.