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Explain the trend in ionisation energies for the group one metals?

The first ionisation energy of an element is the minimum energy required to remove a single electron from one mole of an element in its gaseous state. As you go down the group the first electron becomes easi...
DC
Answered by Dan C. • Chemistry tutor
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What is meant by horizontal and vertical integration and how can they profit a firm?

Firms may grow through integration - vertically or horizontally. Both strategies ultimately increase a firm's competitive position. Vertical integration refers to the supply chain and how a company can grow ...
MP
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If y = ln (x+1) sin x , find dy/dx

u = ln (x+1) v = sin x du/dx = 1/(x+1) dv/dx = cos x Therefore, by the product rule, dy/dx = [sin x / x+1] + [ln (x+1) cos x]
EC
Answered by Edward C. • Maths tutor
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X, a gas, has a mass of 0.270g and is present in a gas syringe with a volume of 105.0cm^3 at 97C and 100kPa. Calculate the Mr of X. (5 marks)

This is a classic A-level question which uses the formula:PV=nRT First, this equation (which needs to be learnt, it is not given in the exam papers) must be rearranged to:n=PV/RTWhat all these letters in the...
JB
Answered by Jack B. • Chemistry tutor
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Describe and explain some of the adaptations xerophytes have against living in extreme dry conditions.

Xerophyte adaptations include: Curled leaves - create a micro-climate of more humid surrounding air, hence less water is lost to the dry surroundings. Small hairs on leaves - slow surrounding air flow, there...
MJ
Answered by Marlon J. • Biology tutor
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