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What is chirality/optical isomerism?

Chirality (or optical isomerism) is a physical property of a molecule which has a non-superimposable mirror image. In other words, a molecule which, when reflected cannot be rotated in any way to make the...

Answered by Matthew W. • Chemistry tutor

13347 Views

When do you use the imperfect and when do you use the preterite?

Trying to differentiate between the use of these two tenses can often prove challenging for Spanish students. However, there are some key points that may help ...

Answered by Summer S. • Spanish tutor

3823 Views

How can algebraic expressions be simplified?

In algebra, long expressions can be simplified which makes them easier to solve.

We can simplify alebraic expressions by collecting together "like terms".

Wh...

Answered by Fraser M. • Maths tutor

12000 Views

What is the difference between "ce" and "se"?

Nothing can distinguishes se and ce when you hear them. However, they have completely different meanings:

- you will always find

Answered by Domitille S. • French tutor

19087 Views

Explain how the eye responds to different light levels.

Light is a sensory stimulus detected by the eye. Rods and cones located in the retina of the eye respond to light. The pupillary reflex is responsible for controlling the amount of light hitting the r...

Answered by Dominic S. • Biology tutor

20900 Views