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How can crude oil be separated into different fractions?

Crude oil is a mixture of different hydrocarbons, of varying length. As they have different boiling points they can be separated.Crude oil is heated/vaporised from oil to gas.These vapours enter the fraction...
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Answered by Zohaib A. • Chemistry tutor
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In order to be successful in your writing exam you will need to know a variety of tenses, do you know all the preterite tense regular endings for AR/ER/IR verbs.

Verb ending in AR: Nadar (to swim). Before adding on the endings we take off the -ar ending and then depending on who is carrying out the action is the ending we add. Yo nad é Tu nadaste El/ella/Ud nad ó Nos...
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Answered by Lily C. • Spanish tutor
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Using your knowledge that tan(x) = sin(x) / cos(x) , how would you write 4/7tan(x)

Since tanx = sinx / cosx that means that the inverse of tan must = the inverse of sinx / cosx which is cosx / sinx . So we know that 1/tanx = cosx . Now all we have to do is apply the multiple 4/7 because 4/...
Answered by • Maths tutor
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A is the point with coordinates (5, 9) B is the point with coordinates (d, 15) The gradient of the line AB is 3 Work out the value of d.

A straight line equation is defined as y=mx+c where m is the gradient and c is the intercept. Since the gradient is already said to be 3 we can substitute this in to mean the equation for AB is y=3x+c. Since...
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Answered by Tarun A. • Maths tutor
10507 Views

How do I remember and use the VANDERTRAMP verbs

Firstly we need to learn how to remember them - I have a song which works for me. Secondly, after writing them out we will look at how they use the verb etre (not avoir) and then the past participle.
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Answered by Eloise D. • French tutor
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