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Explain why graphite conducts electricity.

As carbon is in group 4 of the periodic table it has 4 electrons that it can share with other atoms to form covalent bonds. In the graphite structure, only 3 of these electrons are used for forming covalent ...
JF
Answered by Joshua F. • Chemistry tutor
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Calculate the mass of copper oxide required to produce 24.95 g of copper sulfate crystals (CuSO4.5H2O).

Given the equation for the reaction:CuO(s) + H2SO4(aq)-------> CuSO4(aq) + H2O(l) and the relative formula mass of the copper sulfate crystals Mr=249.5 and the relative atomic masses of O=16 and Cu=63.5Fr...
JH
Answered by Jessica H. • Chemistry tutor
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How do you calculate the amount of moles of a (solid) substance from its mass?

Use the equation:Moles = Mass ÷ Relative mass For example: How many moles are there in 10g of CaCO 3 ? ( to 3 significant figures) Find the relative mass of CaCO 3 by adding up the masses of the atoms that m...
AJ
Answered by Alanah J. • Chemistry tutor
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What happens to the reactivity going down group 7?

The reactivity decreases down group 7 as the atomic radius increases, as the distance between the outer shell electrons and nucleus increases. As a result less energy is required to remove the outer electron.
SS
Answered by Sarish S. • Chemistry tutor
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What happens when two atoms of potassium react with one atom of sulphur?

Bonding between this compound will be ionic as potassium is a metal and sulphur is a non-metal.Therefore electrons are transferred from potassium to sulphur as metals must lose electrons to gain a full outer...
AS
Answered by Amrit S. • Chemistry tutor
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