Search our library of A Level questions

Top answers

All subjects

A Level

Why does propanol have a higher boiling point than propanone, propanal or methyl ethanoate?

Molecules of propanol have a hydrogen directly bonded to a NOF atom (oxygen in this case), which means that they can hydrogen bond with eachother. The oxygen in the other three molecules is only bonded to...

Answered by Katharine W. • Chemistry tutor

38999 Views

suggest and explain two ways the cell-surface membranes of the cells lining of the uterus may be adapted to allow rapid transport of nutrients

The membrane is folded therefore has a larger surface area for transport of nutrients by active transport and diffusion. Also, the membrane has a lot of protein carries in the membrane that are used for ...

Answered by Anna S. • Biology tutor

11573 Views

Two types of long term memory are procedural and episodic. Explain two differences

While procedural memory is mainly related to motor skills, episodic memory stores memories of life events meaning they have different purposes. Another difference is that episodic memory is declarative me...

Answered by Anna S. • Psychology tutor

2777 Views

How revolutionary was the 1905 revolution in Russia

The 1905 revolution was period of unrest in Russia characterised by mass strikes and mutinies; it has often been described as a precursor to the revolution of 1917. For a revolution to have taken place, m...

Answered by Louis V. • History tutor

3628 Views

Use your knowledge of the movement of water to explain why honey has antibacterial properties

Honey has a lower water potential than the water inside bacterial cells due to its high ionic content.Water moves by osmosis from areas of higher water potential to areas of lower water pote...

Answered by Sanskriti S. • Biology tutor

3806 Views