Top answers

Explain why cis- alkenes typically have a lower boiling point than trans alkenes.

Define cis and trans alkenes: Carbon to carbon single bonds can freely rotate to give a carbon chain that can take on a number of shapes (this is to do with the overlap of p - orbitals to form pi bonds) howe...
BB
4795 Views

A reflex occurs the iris of the human eye in response to changes in light levels - describe how these changes occur, referring to the changes in light level in your answer.

I would most likely present a figure of a dilated & undilated pupal and hopefully this will begin their thought process. To receive full marks for this answer, I will be looking for the below points:• pu...
BS
Answered by Brandon S. • Physics tutor
2771 Views

What is red-shift and how does it work?

When we see light, the colour of light that we see is determined by the wavelength of the light. Violet light has the shortest wavelength, and red light has the longest wavelength. Red shift happens when we ...
TD
2817 Views

A newspaper runs a competition in which every entrant guesses an integer between 0 and 100 inclusive, the winner of the competition is the person who's guess is closest to 2/3rds of the average integer guessed, what number do you guess?

If I was helping prepare a student for an oxbridge interview I would begin by reminding them not to rush into the answer, explaining that tutors want to see your logical thinking process, and that rushing in...
DO
1775 Views

Explain the difference between a longitudinal and transverse wave.

Imagine we have a wave that is travelling from left to right. This is the wave's direction of motion, or what is sometimes called the direction of "energy propagation". In a transverse wave the par...
RG
Answered by Ross G. • Physics tutor
7211 Views