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Compare the structure between graphite and diamond

KeypointsEach diamond carbon is covalently bonded to 4 other carbonsEach graphite carbon is covalently bonded to 3 other carbonsDiamond is very hard due to its tertrahedral structureGraphite is made up of la...
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Answered by Hamza A. • Chemistry tutor
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C is a circle with equation x^2 + y^2 = 16. The point P = (3,√7) is on C. Find the equation of the tangent to C at the point P.

First, we note the centre of the circle is at the origin (0,0). Then we calculate the gradient of the line OP, the line connecting the origin to P. The gradient = change in y / change in x = (√7 - 0) / (3 - ...
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Answered by Daniel C. • Maths tutor
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How can I prepare for an unseen poetry question?

Preparing to write an essay on an unseen poem can seem challenging, especially as you cannot predict what the poem will be, or even what theme it will have or what period of time it will come from. However, ...
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Answered by Verity S. • English tutor
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y is inversely proportional to x. y = 0.04 when x = 80. Find the value of y when x = 32.

If y is inversely proportional to x. We know that y=k/x for some constant k. We need to find this constant before continuing. Looking at the information given to us in the question we know for one example th...
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Answered by Tyler T. • Maths tutor
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solve the simultaneous equations 8x + 2y = 48 , 14x + 6y = 94

Step 1) Rearrange the first equation to make y the subject: 8x + 2y = 48 , 2y = 48 - 8x , y = 24 - 4x. step 2) Sub y = 23 - 4x into the second equation: 14x + 6(24 -4x) = 94 , 14x + 144 - 24x = 94 Step 3) so...
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Answered by Harrison S. • Maths tutor
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