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Complete the balanced equation for the overall reaction in a hydrogen fuel cell. _ H2 + ___ > _ H2O

Hydrogen fuel cells are really important as they can be used to power electrical cars, so it's something that a lot of scientists are looking into at the moment. We need to balance this equation, so we need ...
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Answered by Kyra B. • Chemistry tutor
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What best explains the success of the first crusade?

Overview : The success of the First Crusade can be best explained with multiple factors contributing, some with more effect than others. These factors include Spiritual devotion, Military tactics, strong lea...
Answered by • History tutor
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A and B are points on a circle, centre O. BC is a tangent to the circle. AOC is a straight line. Angle ABO = x°. Find the size of angle ACB, in terms of x. Give your answer in its simplest form. Give reasons for each stage of your working.

(This question is from the Edexcel Higher GCSE paper 2018) As BC is a tangent to the circle, we know that angle OBC must be a right angle (90 degrees)We also know that lines OA and OB are both the same lengt...
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Answered by Rachel T. • Maths tutor
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Outline the process of protein synthesis (8 marks).

Firstly, we need to understand what the question title is asking... ' Outline ' means to roughly describe and give a summary of the key points of a ' process ' which is a series of chronological stages. Prot...
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Answered by Natalie H. • Biology tutor
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How to structure an exam answer

First you must allocate time to feature spot the text after the reading time set, this can be about 5 minutes. Look for where ambitious terminology can be used, for example, if amelioration (language change ...
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