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2.11g of MgCl2 is added to 30cm3 of water. Find the concentration of chloride ions in the solution.

M r of MgCl 2 = 24.3 + 2(35.5) = 95.3 Moles added = 2.11/95.3 = 0.02214 Mol of cl - added = 2 0.02214 = 0.04428 Conc = 0.04428/(30 10 -3 ) = 1.48 moldm -3
JS
Answered by James S. • Chemistry tutor
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How does blood flow through the heart?

The heart is the muscle responsible for pumping blood around the body. It has four chambers: an atrium and ventricle on the left, and an atrium and ventricle on the right. Atrioventricular and semilunar valv...
MB
Answered by Moriom B. • Biology tutor
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Give one advantage and one disadvantage of laboratory experiments.

A question like this is likely to be worth 2-4 marks. In order to answer the question fully, you will need to state the advantage or disadvantage and then explain your reasoning. An advantage of laboratory e...
RD
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Use the binomial series to find the expansion of 1/(2+5x)^3 in ascending powers of x up to x^3 (|x|<2/5)

We want to rearrange the expression to the form (1+y)^n so we can use the general result: (1+y)^n=1+ny+[n(n-1)/2]y^2+[n(n-1)(n-2)/3!]y^3+... 1/(2+5x)^3 = (2+5x)^-3 = [2(1+5x/2)]^-3 = (2^-3)(1+5x/2)^-3 using ...
SJ
Answered by Saskia J. • Maths tutor
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Describe one of the differences between the criminal law and civil law systems

One of the main differences between the two systems would be regarding the parties to the case. In a civil law claim, there would be a claimant and a defendant (both generally individuals or companies) where...
JM
Answered by Jared M. • Law tutor
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