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Explain why an atom has no overall charge.

An atom is comprised of protons, neutrons, and electrons. Protons have positive charge and the number of protons is dictated by the proton number, which is the same as the number of electrons, which have neg...
JC
Answered by James C. • Chemistry tutor
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Write down the equation for the Gibbs Free Energy change of a reaction. Hence explain why, for a spontaneous endothermic reaction, there must be an increase in the total entropy.

Gibbs Free Energy change: (delta)G = (delta)H - T(delta)S For a spontaneous chemical reaction, (delta)G must be negative. An endothermic reaction has a positive (delta)H value therefore, in order for the rea...
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Answered by James C. • Chemistry tutor
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What does reversible mean?

Reversible is a term used for certain reactions that never reach a final stage. So imagine we have A and B reacting together to form C, and we say that this reaction is reversible. So at a point in time, in ...
AT
Answered by Antonis T. • Chemistry tutor
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What is the rate of a reaction and how can you determine it experimentally?

The rate of a reaction is the rate at which reagents are used up and product are formed. Reaction rates depend on concentration. A typical rate law is rate=k*[A] m *[B] n . To find the values of m and n we w...
AC
Answered by Antonia C. • Chemistry tutor
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5.95g of potassium bromide was dissolved in 400cm3 of water. 1) calculate its molarity, 2)its concentration in g/dm3.

0.125 M 2) 14.875 g/dm3
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Answered by Natalie F. • Chemistry tutor
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