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Why can graphite conduct electricity but not diamond?

In graphite, each carbon atom is covalently bonded to three other carbon atoms. One of the four outer shell electrons of each carbon atom is therefore not engaged in bonding, and becomes delocalised. These d...
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Answered by Tierney A. • Chemistry tutor
93599 Views

What is the multi-store model of memory?

Atkinson and Shiffrin (1968) proposed a model of memory that consists of three stores: the sensory store, short-term memory and long-term memory. The sensory store receives information about the world from t...
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Answered by Sarah T. • Psychology tutor
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Solve the Simultaneous equations '2x-3y=24' and '6x+2y=-5'

To solve you must make sure there are the same number of either x's or y's in both equations. We will call '2x-3y=24' equation 1, and '6x+2y=-5' equation 2. If you multiply equation 1 by 3 then you get '6x-9...
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Answered by Elena S. • Maths tutor
7868 Views

What is the difference in 'Est' and 'Et' when writing in French?

This seems like a very easy grammatical aspect but a lot of people have trouble with it. When speaking both these words sound the same which is why it can be very tricky when writing and using these. The bes...
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Answered by Isham S. • French tutor
60524 Views

Factorise x^2-7x+12

First write down all the factor pairs of 12 (1,12) (-1,-12) (3,4) (-3,-4) (6,2) (-6,-2). From these factors, find a pair that, when added together, is equal to -7. In this case the correct pair would be -3 a...
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Answered by Harry D. • Maths tutor
10598 Views