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Explain why potassium is more reactive than sodium, giving the balanced chemical symbol equation for the reaction of potassium and water.

K + H 2 O --> KOH + H 2 Both potassium and sodium possess one electron in their outer shell. Both elements readily give up this unpaired electron and so for this reason are considered very reactive elemen...
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Answered by Liam F. • Chemistry tutor
66881 Views

What uses does the word 才 cai2 have and in which contexts can it be applied?

Expressing Lateness with "cai"Subj. + Time Word + 才 + Verb我 等 了 两 个 小时 才 买到 票。Expressing Small Quantity with "cai"才 ( + Verb) + Measure Word + Noun我们 有 这么 多 人，你 才 点 了 三 个 菜。Expressing &qu...
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Answered by Jack H. • Mandarin tutor
2995 Views

How is nature presented in Shakespeare’s ‘Macbeth’?

Think about the natural landscapes we see in 'Macbeth'. How do the witches make their spells? Is there a particular significance to the ingredients? It might be a good idea to introduce your essay by talking...
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Answered by Emily D. • English tutor
4474 Views

If x^2 + y^2 = 20 and y=10 - 2x, find x and y.

First work out y 2 using the second equation, making sure to do this using the FOIL technique. Then substitute this into the first equation to get 5x 2 - 40x - 80 = 0. All the terms in this can be divided by...
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Answered by Sara T. • Maths tutor
9651 Views

When analysing poetry, how do we approach a text without feeling overwhelmed?

There's no one right answer to this, but if you're stuck on a poem, a simple method of analysis and unpicking might be of help. Firstly, take a moment to read the whole poem before you begin analysing. It wi...
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