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A naturally occurring sample of the element boron has a relative atomic mass of 10.8 In this sample, boron exists as two isotopes. Calculate the percentage abundance of 10B in this naturally occurring sample of boron.

The answer is 20%. This is a failry common question and stomps many students. The easiest way to answer this question, in my opinion, is to see that this question is asking you to figure out the ratio of iso...
TA
Answered by Tony A. • Chemistry tutor
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What is an acid-base titration?

A titration is way to find an unknown concentration of a sample through a chemical reaction. The most common titration involves an acid and base to react. In order to set our experiment a standard is needed,...
GZ
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In terms of structure and bonding explain why the boiling point of magnesium is much higher than that of bromine?

Bromine is molecular, existing as Br2 molecules, wheras magnesium is metallic and therefore exists in a large macromolecular structure. In bromine there are strong INTERmolecular covalent bonds, but only wea...
EB
Answered by Edwina B. • Chemistry tutor
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Why is the enthalpy of hydration of a chloride ion more negative than that of a bromide ion, using your knowledge of the attractive forces involved.

Chloride ions have a greater charge density than bromide ions due to their smaller size, and therefore attracts the delta positive H in the water molecule more strongly. This would be approximately a 3 mark ...
AD
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How do you calculate an empirical formula

An empirical formula is the simplest ratio of atoms of each element in a compound. You will be given either the mass of each element in the compound or the % mass. 1. Divide each mass (or % mass) by the atom...
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Answered by Tanisha S. • Chemistry tutor
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