Search our library of homework questions

Top answers

All subjects

All levels

When vaporised, isotopes of an element can be separated in a mass spectrometer. Name the three processes that occur in a mass spectrometer before the vaporised isotopes can be detected. State how each process is achieved. (6 marks)

Once the sample is vaporised, high energy electrons are fired at the sample which knocks off a loosely held electron. (1) This step is known as election impact ionisation. (2) Due to the presence of a cha...

Answered by Madalina F. • Chemistry tutor

4169 Views

Curve C has equation y=(9+11x)/(3-x-2x^2). Find the area of the curve between the interval (0, 1/2). State your answer in exact terms.

The word "area" should highlight that it is an integration question to the student. The interval asked for is (0,1/2) and so the curve should be integrated between that interval.The first task i...

Answered by Isha A. • Maths tutor

2704 Views

Expand and simplify 4x(x+3) - (2x-3)2

When dealing with such a question, an expansion question, the first part of the equation to look at is the brackets.Looking at the question above, one can see that there are two pairs of brackets - it wou...

Answered by Tofi O. • Maths tutor

8456 Views

Where should I apply?

consider what you are applying with. what are your predicted grades like? how strong are your GCSE results? How well did your UKCAT go? are you sitting the BMAT? These alone will give you a good indicatio...

Answered by Sylvia M. • Medical School Preparation tutor

1234 Views

Solve the simultaneous equations: 2x+2y = 10 and 7x + 4y = 26

The first step with any simultaneous equation is to cancel out one of the variables. Here, 2y is a factor of 4y (it fits into 4y twice) so we can multiply the 1st equation by 2 to give us 4x+4y = 20.This ...

Answered by Sylvia M. • Maths tutor

4636 Views