Search our library of homework questions

Top answers

All subjects

All levels

Explain how chromatography is used to separate components in a mixture.

Chromatography separates components in a mixture according to their solubility in the mobile phase and their adsobance to the stationary phase. The mobile phase is the part of the chromatography set up th...

Answered by Immy C. • Chemistry tutor

19757 Views

GSCE: How is a delta formed? (5 marks)

A delta is formed in the lower course of a river when the river reaches the sea, or another still body or water such as a large lake. The river slows down and loses energy as there is now no limiting chan...

Answered by Caitlin B. • Geography tutor

16596 Views

Explain why the price elasticity of demand for two products may vary.

Price elasticity depends on several other components:

Availability of substitutes

The proportion of a consumer's disposable income which the products account for

TB
Answered by Thomas B. • Economics tutor
2433 Views

How do I integrate ln(x), using integration by parts?

This is a common question among A-Level Maths students, as integration by parts requires 2 things: 1. Something to integrate ; 2. Something to differentiate. In ln(x), we can immediately see that ln(x) is...

Answered by Mustafa K. • Maths tutor

3509 Views

How do alveoli create a surface for efficient gas exchange?

This kind of question is extremely common in A level biology, they want you to explain a system and apply your knowledge of biological principals to it.

To understand alveoli we need to understand ...

Answered by Matthew C. • Biology tutor

7736 Views