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why do metallically bonded structures conduct electricity

In order for metals to bond they need to loose electrons to ensure that they have a full outer shell and become positively charged. The positive cations (metal ions) are attracted to the negatively charge...

Answered by Lauren P. • Chemistry tutor

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By expressing cos(2x) in terms of cos(x) find the exact value of the integral of cos(2x)/cos^2(x) between the bounds pi/4 and pi/3.

cos(2x)=cos²(x)-sin²(x)=2cos²(x)-1
Therefore:cos(2x)/cos²(x)=(2cos²(x)-1)/cos²(x)=2cos²(x)/cos²(x) - 1/cos

Answered by Hugo F. • Maths tutor

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Evaluate the usefulness of Source C as evidence of the subjugation of the Scots by Edward I in 1296. (6 marks).

Source C is an extract from the Chronicle of Walter of Guisborough. This makes the source useful, as chronicles were generally factually based accounts of historical events in chronological order, which c...

Answered by Megan R. • History tutor

2911 Views

What is the basic Economic problem, and how does Economics as a discipline approach this?

The basic economic problem is usually defined as there being a situation of scarce resources but an unlimited or infinite number of wants and demands for these resources. Economics as a discipline seeks t...

Answered by Alexander M. • Economics tutor

2254 Views

How do I write a personal statement?

A personal statement is an opportunity to illustrate your personality and skills to the universities you are applying to. Essentially the main question that you are answering here is “Why should we (the u...

Answered by Arietta C. • Personal Statements tutor

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