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How does sodium chloride (salt/grit) lower the freezing point of water?

Water is a highly ordered material. When something dissolves in water, some of these O-H bonds are broken. This requires heat energy. The water molecules can then form attractive interactions to solute io...

OO
7317 Views

How should I structure my history essay?

Structure is key to gaining top marks at A-Level History. First, it is very important that you have a strong, short introduction which sets out your line of argument and the key debate surrounding the que...

TD
3812 Views

Work out the value of 2a^2 + b^3 when a = 5 and b = –3

It is best to approach this question in parts, then combine the parts to find your solution. This question may be split into parts, as follows: Firstly, if a = 5, then a2 = 52 = 5 x ...

TD
Answered by Tutor51449 D. Maths tutor
13466 Views

Integrate x^2sin(x) between -pi and pi

It is possible to solve this question using integration by parts. However, we note that sin(x) is an odd function, meaning that sin(-x) = -sin(x). Thus x2sin(x) is also an odd function. This me...

HL
6452 Views

Explain the Rule of Law doctrine.

1) Definition of the Doctrine

The Rule of Law (ROL) is one of the three central doctrines of the English constitution, alongside the Separation of Powers and Parliamentary Sovereignty. It wa...

AJ
Answered by Arron J. Law tutor
20368 Views

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