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How do you work out the oxidation number of a atom in a compound?

To work out an oxidation state of an atom you need to assign the electrons on the atoms outer shell to the most electronegative atom.O>N>C>H. Electrons in the outer shell of two of the same atoms ar...
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Answered by Charles H. • Chemistry tutor
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Explain the variation of atomic radius along a period and along a group of the Periodic Table

The atomic radius is mostly influenced by the electron cloud and its interaction with the nucleus.Along a period, the atomic number increases, which indicates that the number of electrons also increases, giv...
MC
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Formic acid (CH2O2) is used as an antibacterial on livestock feed. A sample of formic acid has been found to have a pH = 3, and data shows it has a Ka = 1.6E-4 M. What is the concentration of the sample?

This question tests your knowledge on weak acids, pH, Ka and equilibrium. (Note: E notation has been used, E-3 is x10 -3 ). Formic acid is a weak acid and so does not fully dissociate, the degree of dissocia...
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Answered by Kieran O. • Chemistry tutor
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What is the difference between intramolecular and intermolecular forces for covalently bonded molecules?

Intramolecular forces are the forces that hold atoms together or arrange atoms in specific position relative to other atoms within one molecular entity . For example, water, whose chemical notation is H 2 O,...
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Answered by Thomas H. • Chemistry tutor
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What evidence is there for delocalisation in benzene?

X-ray diffraction shows all carbon-carbon bonds in benzene are the same length (140 pm), between the lengths of a single (147 pm) and double bond (135 pm). This suggests that Kekule's alternating single and ...
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Answered by William B. • Chemistry tutor
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