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What is an acid?

An acid is a substance which releases hydrogen ions (protons) when added to water. pH values of less than 7 are considered acidic, with 1 indicating it is a strong acid.
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Answered by Ellie W. • Chemistry tutor
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Outline the process of neuronal communication between two neurones

Ensure that your answer is precise, without too much waffle - this can confuse examiners and you'll lose easy marks! Take it step by step: First, the neurotransmitter , acetylcholine , is released from the p...
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Answered by Ellie W. • Biology tutor
3056 Views

How do I write a top French A-level essay?

To write a top essay in French, you need structure, vocabulary and complex structures. Try to use topic-related vocab for both AS topics and for A2 literature, and try to use complex structures in as many se...
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Answered by Owen T. • French tutor
20126 Views

Differentiate x^x

This can't be differentiated with the usual methods (chain rule, product rule). First we set y = x x , and our objective is to calculate dy/dx in terms of x. To turn this function into more familiar function...
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Answered by Joel T. • Maths tutor
13909 Views

Why does a feather fall at the same rate as a hammer on the Moon?

To calculate an object's weight, we have weight = mass * gravitational field strength (W = mg). From this, we see that an object with a greater mass (e.g. a hammer compared with a feather) has a greater weig...
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Answered by Joel T. • Physics tutor
10602 Views