Top answers

What is the position of chemical equilibrium and how can it change? (A-Level/high GCSE)

A dynamic chemical equilibrium refers to a reversible chemical reaction, where the forward and reverse reactions are happening at the same rate. This results in the concentrations of reactant and product bei...
JC
Answered by James C. • Chemistry tutor
34072 Views

Why do nerve impulses travel faster in myelinated neurons?

The myelin sheath is a fatty layer made up of the hugely expanded plasma membrane of schwann cells which surround the axon of neurons. The axon is unprotected where the sheath of one cell meets the next and ...
DP
Answered by Dolcie P. • Biology tutor
5492 Views

Deduce a formula (in terms of n) for the following sum: sum (2^i * i) where 1<=i<=n, n,i: natural numbers ( one can write this sum as: 1*2^1+ 2*2^2+ .. +n*2^n)

Let S = sum i* 2 i (i=1,2..n) We multiply this by 2 and we obtain:2S = sum (i 2 i+1 ) = sum [(i+1-1) * 2 i+1 ]= sum[ (i+1) 2 i+1 ] - sum 2 i+1 i=1,2..n ( ) sum (i+1) 2 i+1 = 2 2 2 + .. n 2 n + (n+1)* 2 n+1 =...
AS
Answered by Alexandru S. • MAT tutor
2303 Views

How should I approach writing a personal statement?

The key to writing a personal statement is to make it personal. Avoid using flowery language that you wouldn't use in everyday life, keep it professional sounding but make sure its your own voice. Make sure ...
ES
1989 Views

How does long shore drift work?

Long shore drift is the process by which sediment is moved along a beach in the direction of the prevailing wind. Sediment is sand, gravel and other small particles that make up a beach and seabed. The preva...
ES
Answered by Ella S. • Geography tutor
6011 Views