Top answers

Proton NMR Made Easier

Proton or 1 H NMR can look complicated but with practice; there are techniques that can make the peak assignment a little easier.1. Make sure you count the proton environments correctly, if the molecule disp...
ML
Answered by Martin L. • Chemistry tutor
4870 Views

What is a stationary point on a curve? How do I calculate the co-ordinates of a stationary point?

A stationary point simply means a point in a curve where the gradient is equal to 0.For example, in the June 2015 C3 Paper it is asked:Find the exact values of the coordinates of the stationary points of the...
ML
Answered by Martin L. • Maths tutor
6614 Views

What is the role of ATP in muscle contraction?

ATP is responsible for cocking (pulling back) the myosin head, ready for another cycle. When it binds to the myosin head, it causes the cross bridge between actin and myosin to detach. ATP then provides the ...
TD
Answered by Thomas D. • Biology tutor
67767 Views

How is the lung adapted for gaseous exchange?

The lung consists of one cell thick bronchioles , which feed into round structures called alveoli , which are round in shape and also one cell thick. The bronchioles and alveoli are surrounded by capillaries...
TD
Answered by Thomas D. • Biology tutor
11550 Views

A curve is defined by the parametric equations x = 3 - 4t, and y = 1 + 2/t. Find dy/dx in terms of t.

At first glance, this looks quite tricky, as usually when we are asked to find dy/dx, we have one equation, but here we have 2.So in this case, we need to use the statement that dy/dx = (dy/dt) * (dt/dx)Then...
WM
Answered by Wesley M. • Maths tutor
11266 Views