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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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Rank the following acids according to acid strength, strongest to weakest: HF, HCl, HBr. Explain your reasoning.

Answer: HBr, HCl, HF Firstly, we must understand what is meant by "acid strength". Simply put, it's the concentration of "free" hydrogen ions (H+) in solution. Acids dissociate (liberate ...
EK
Answered by Edgar K. • 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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Why is a water molecule non-linear?

Valence Shell Electron Pair Repulsion Theory (VSEPR) states that lone pairs repel other lone pairs more so than they do bonded pairs. In water, the oxygen atom has two lone pairs. These two lone pairs repel ...
HM
Answered by Harry M. • Chemistry tutor
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