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What are the 2 methods used to manufacture ethanol? What are the advantages and disadvantages of both?

The hydration of ethene: Ethene and steam are passed over a catalyst - concentrated phosphoric acid (H 3 PO 4 ) - at 300 O C and 60-70 atmospheres. This process is fast, continuous and gives a pure product b...
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Answered by James P. • Chemistry tutor
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How is the the small intestine adapted for absorption?

The Ileum is long (up to 7m!) and has a very high surface area due to the presence of many villi and microvilli . A single villus is made up of many cells, each with lots of microvilli, and have many blood v...
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Answered by James P. • Biology tutor
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I buy a car from a dealership for £3500. The car depreciates in value for every year I own it. What is the value of the car after I have owned it for 18 months if it depreciates at a rate of 5 percent?

This is a compound interest problem. Here we have to put 18 months in terms of years. There are 12 months in a year, so 18 months is a year and 6 months. 6 months is half a year, so 18 months represents a ye...
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Answered by Lauren M. • Maths tutor
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In triangle XYZ: XZ = 10 cm; YZ = 8 cm; cos Z = 1/8. Calculate the length of XY.

We can use the cosine rule to determine the lenght of XY. XY 2 = 10 2 +8 2 -2 10 8 cos ZXY 2 = 100+64-180 (1/8) = 144XY = 12
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Answered by Vencel H. • Maths tutor
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Explain why Hitler was able to create a dictatorship in the period February 1933 to August 1934. You may use the following in your answer: the Reichstag Fire; the Night of the Long Knives. You must also use information of your own. (12)(Edexcel past Q)

It is important to recognise immediately that this question is asking you WHY Hitler was able to create a dictatorship. Detailing or describing important factors with no explicit link to the question means y...
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Answered by William B. • History tutor
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