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Simplify: y+y-x×x

y+y=2y x×x=x 2 therefore, y+y-x×x=2y-x 2
KG
Answered by Kieran G. • Maths tutor
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Why is Fluorine in the group 7 of the periodic table? Which element, Fluorine or Chlorine, has a higher electronegativity? Explain your answer.

Group 7 of the periodic table contains all the elements known as halogens. They all have 7 valence electrons (hence group 7!) in their outer shell (insert diagram or prop to show what the outer shell signifi...
CS
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4.00 g metal carbonate, MCO3 reacts with acid to liberate a gas that occupies 0.5878 dm3 at 25˚C and 2.0 x 105 Pa. Identify the group 2 metal, M. Info: R = 8.314 J K-1 mol-1

First it is important to recognise that this is an ideal gas equation question – the exam boards love these so try to get used to spotting if you have the necessary quantities. This is a multi-step problem, ...
ID
Answered by Isabel D. • Chemistry tutor
5777 Views

A circle has radius 6, what is its area?

Area=pi x r 2 r=6, hence Area =36pi
AS
Answered by Anna S. • Maths tutor
5588 Views

Highlight the main differences in the style of painting from the Renaissance and Baroque periods.

Many stylistic features changed from the fifteenth to the seventeenth century. In order to fully understand these changes, it is first important to understand the motivation of each period. The Renaissance w...
GS
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