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Describe the reasons why the rates of strontium and barium with water is different

Barium reacts quicker with water than strontium as it has a lower first ionisation energy than strontium as barium has a larger atomic radius and so their is more shielding for the outer electrons. although ...
ME
Answered by Mohamed E. • Chemistry tutor
13346 Views

Describe the stages in DNA transcription and translation

First DNA helicase unwinds the strand of DNA. Then, DNA polymerase binds to the anti-sense strand of the DNA and adds RNA nucleotides in a sequence complementary to the strand of DNA. The DNA polymerase cata...
IN
Answered by Iona N. • Biology tutor
3561 Views

find dy/dx at t, where t=2, x=t^3+t and y=t^2+1

We know from simple fraction rules that dy/dx=(dy/dt)/(dx/dt). dy/dt=2t, dx/dt=3t^2+1. Therefore, dy/dx=2x2/12+1=4/13
NO
Answered by Niamh O. • Maths tutor
6533 Views

How does Acetylcholine act on a neuronal synapse, and how is it re-uptaken?

- Ca2+ voltage gated channels are activated due to an action potential reaching the synapse - Acetylcholine rests in the pre-synaptic cleft - They are stored in vesicles - The calcium influx causes the vesic...
KR
Answered by Krishan R. • Biology tutor
3166 Views

A curve has equation x^2 + 2xy – 3y^2 + 16 = 0. Find the coordinates of the points on the curve where dy/dx =0

We would do this by differentiating everything individually so to differentiate x 2 we multiply the x 2 by the power which is 2 and then take the power down by 1 to make 2x. To differentiate 2xy we would use...
TK
Answered by Tom K. • Maths tutor
5533 Views