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How do you analyse a primary source?

The easiest way to analyse a primary source (a source from the time period you are studying) is to remember the 4 Ws:

WHAT: What type of source is this? A letter, a picture, a diar...

Answered by Jennie S. • History tutor

2436 Views

Explain why graphite is able to conduct electrcity and diamond is not

Carbon in graphite has three bonds, where as the carbon atoms in diamond form four bonds to one another. As carbon has 4 electrons in its outer shell, this means graphite has one free electron which is ab...

Answered by Qasim J. • Chemistry tutor

8718 Views

Give the reagents and conditions needed to convert a secondary alcohol into a ketone. Name the process which occurs during the conversion.

Reagents: Potassium dichromate and concentrated sulfuric acid (catalyst) Conditions: Heat under reflux The process which happens when a secondary alcohol is converted to a ketone is called oxidation.

Answered by Lucy S. • Chemistry tutor

5157 Views

How do you expand brackets? eg. (2x+3)(3x+4)

Use the FOIL method for: (2x+3)(3x+4)

First e.g. multiply first two numbers (2x and 3x)

Outside e.g. 2x and 4

Answered by Naba C. • Maths tutor

5572 Views

Solve this simultaneous equation: 5x+6y=3 and 2x-3y=12.

Firstly, I will provide a mark scheme and then a full explanation underneath. 5x+6y=3. (1) 2x-3y=12. (2). (5x+6y=3)+(2(2x-3y=12)). (5x+6y=12)+ (4x-6y=24). 9x=27. x=3. Put x is (1) 5(3)+6y=3=15+6y=3. 6y=-1...

Answered by Ashni M. • Maths tutor

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