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How does MRI work?

MRI stands for magnetic resonance imaging and uses the application of a magnetic field and radio frequency photons to manipulate the spin state of protons (hydrogen nuclei). Hydrogen is one of the most abund...
SV
Answered by Sebastian V. • Biology tutor
10415 Views

How do I calculate the percentage by mass of a metal within an impure substance?

For this question we will look at Sodium Sulphite (Na 2 SO 3 ) and its titration against Potassium Permanganate (KMnO 4 ). This requires acidic conditions. In this example we need to know several things: Tha...
SV
14928 Views

Passé Composé/Adverb endings (é/ée etc.)

In French, a lot of people get confused with when to put 'é' or 'ée' at the end of either a passé composé or as an adverb: 'elle a décid é de lui dire la vérité' / 'la vérité est ce qu'elle a décid ée de lui...
LM
Answered by Laura M. • French tutor
10255 Views

What is the basis of an NMR spectrum?

Nuclear Magnetic Resonance (NMR) is a spectroscopic technique used to detect certain nuclei in a molecule. 1 H and 13 C are the most commonly identified nuclei , however nuclei with an odd mass number can ex...
JT
Answered by Joanna T. • Chemistry tutor
4265 Views

How do I differentiate y = ln(sin(3x))?

So we initially have the relationship y = ln(sin(3x)). As the left hand side is a function of the variable y and the right hand side is a function of the variable x i.e they are implicitly related, we need t...
IW
Answered by Ifan W. • Maths tutor
21262 Views