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The intermolecular interactions between halogen molecules are Van der Waals' forces. Explain how these Van der Waal's forces arise between halogen molecules.

Electrons are mobile or move in halogen molecules. Therefore, there can be an uneven distribution of electrons or electron density in halogen molecules (1 mark). This creates a temporary or instantaneous dip...
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Answered by Andrew L. • Chemistry tutor
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Find the derivative of y=e^(2x)*(x^2-4x-2).

Notice that y can be expressed as y=f(x)g(x), in which f(x)=e^(2x) and g(x)=x^2-4x-2.Through the product rule, we know that dy/dx=f'(x)g(x)+f(x)g'(x).Through the chain rule, we can solve f(x) by rewriting in...
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Answered by Samuel H. • Maths tutor
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Solve x^2+4x-5=0

Two approaches.1.Note that the equation is a quadratic equation, and can thus be solved per the quadratic formula, in which the solutions are given to be (-b+-sqrt(b^2-4ac))/2a.Plugging in the values from th...
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Answered by Samuel H. • Maths tutor
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Discuss the differences between operating systems designed for desktop computers and embedded systems.

Desktop:Supports a wide range of peripheralsRun a wide range of softwareManage securityNetworking protocols(etc)Embedded:Low hardware requirementsManage power consumptionNo/minimal UII/O(etc)
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Answered by Samuel H. • Computing tutor
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What are the consequences of drug use in sport on the sport itself?

The 'clean' athletes and new records set are questioned and not given credit they deserve. It creates bad publicity and a bad name for the sport, e.g Tour de France cycling after Lance Armstrong doping case....
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