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How do I structure a 30-mark extended essay answer? (OCR Geography A2 level)

The first thing to do is make a plan. Spend 5-10 minutes doing this to make sure you fully understand what the question is asking. Briefly write what you want to include in your introduction, main body an...

Answered by Charlotte L. • Geography tutor

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The line l is a tangent to the circle x^2 + y^2 = 40 at the point A. A is the point (2, 6). The line l crosses the x-axis at the point P. Work out the area of triangle OAP.

This will involve drawing a diagram to aid your answer. Where O is the origin, A is a point on the circle and P is a point on the x-axis. OA is the radius of the circle. Line l crosses through point A and...

Answered by Tutor51285 D. • Maths tutor

30953 Views

List 3 differences between a plant cell and an animal cell

Plant cells have choloroplasts and animal cells do not, plant cells have a vacuole and animal cells do not, plant cells have a cell wall while animal cells only have a membrane

Answered by Gal B. • Biology tutor

16638 Views

Would it matter if tigers became extinct? Why do lions have manes? Why do we have red blood cells?

Some of the best interview questions do not have a 'right' or a 'wrong' answer, and can potentially lead off in all sorts of different directions. It's much more about how people approach the problem/ques...

Answered by Tutor51285 D. • Oxbridge Preparation tutor

2800 Views

Q3. A third beaker, C, contains 100.0 cm^3 of 0.0125 mol/dm^3 ethanoic acid ( Ka = 1.74 × 10^−5 mol/dm^3 at 25 ºC). Write an expression for Ka and use it to calculate the pH of the ethanoic acid solution in beaker C.

A3. Ethanoic acid is a weak acid with the formula CH3COOH. It will dissociate into H+ and CH3COO- therefore the expression for Ka is [H+][CH3COO-]/[CH3COOH] The [H+] = [CH3COO-] and so the expression ...

Answered by Tutor51285 D. • Chemistry tutor

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