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How are the human lungs specialised for gas exchange?

Gas exchange is when oxygen is transferred from the air in the lungs to the blood and carbon dioxide is transferred from the blood to the air in the lungs. It occurs in the alveoli of the lungs.The lungs ...

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Answered by Anna D. • Biology tutor
25402 Views

When do I use the subjunctive tense?

It's better to think of the subjunctive as a mood rather than a tense. As a general rule, it is used to express a feeling of uncertainty in a sentence.

 

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JO
Answered by Jordan O. • Spanish tutor
4311 Views

When should I use qui/que/ce qui/ce que?

Qui, que, ce qui and ce que are all relative pronouns. This means that they link a noun with a relative clause. 

SJ
Answered by Shannon J. • French tutor
20969 Views

What is a racemic mixture?

To explain a racemic mixture it is firstly necessary to explain what an enantiomer is.

Enantiomers are stereoi...

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Answered by Katie G. • Chemistry tutor
24629 Views

What is the difference between a weak and strong acid?

To answer this question it is easiest to firstly define both a weak and strong acid.

A strong acid is an acid that completely dissociates into its component ions in solution.

A weak ac...

KG
Answered by Katie G. • Chemistry tutor
7384 Views

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