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Expand the brackets: (2m-3)(m+1)

To expand the brackets we consider each bracket separately, (2m-3) which is multiplied by (m+1). Consider first the first identity in each bracket:2m x m = 2m 2 Then consider the first identity and the last ...
HM
Answered by Hannah M. • Maths tutor
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Name a suitable chemical used to convert propanol to propanoic acid?

Acidified Potassium Manganate(VII). Propanoic acid (which is a carboxylic acid) can be made by oxidising propanol (which is an alcohol). In this case, oxidation involves adding an oxygen atom and removing tw...
KG
Answered by Kate G. • Chemistry tutor
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Explain why Francium is the most reactive Group 1 element in terms of its electronic structure.

All group 1 elements have 1 electron in their outer shell, making this the electron that is involved in reactions. As you move down a group in the periodic table the number of shells increases, which means t...
JF
Answered by Jordan F. • Chemistry tutor
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How should I divide up my time during the exam?

Use the number of marks as a guide - if the paper is worth 80 marks and you're given 1.5 hours, I'd allocate 1 minute per mark which would give you 10 minutes (or more if you're quick) to check over your ans...
RR
Answered by Ruth R. • Maths tutor
6075 Views

The point P has coordinates (3,4). The Point Q has the coordinates (a,b). A line perpendicular to PQ is given by the equation 3x+2y=7. Find an expression for b in terms of a.

As we appreciate the rule 1: gradient of line PQ multiplied by the gradient of the line perpendicular to it equals -1. Formula: m x mn=-1We use this to find the gradient of line PQ:Firstly, we find the gradi...
RT
Answered by Richard T. • Maths tutor
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