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There are two isotopes of element A. Information about the two isotopes is shown in Table 4. Table 4 Mass number of the isotope 6 7 Percentage abundance 92.5 7.5 Use the information in Table 4 to calculate the relative atomic mass of element A. Give your

92.5/100 x 6 = 5.557.5/100 x 7= 0.5255.55 + 0.525 = 6.075= 6.08 (2dp)
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Answered by Natasha C. • Chemistry tutor
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Describe why diamond is hard and graphite is soft?

Diamond and graphite both only have carbons and have covalent bonding involved.Diamond has a giant covalent lattaice and each carbon atom is bonded to 4 other carbon atoms.Graphite on the other hand is forme...
MS
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What is a mole and the calculations used to find the number of moles?

A mole in chemistry is a unit of amount. Similar to saying a dozen is 12, a mole is 6.022x10^23 atoms, conveniently called Avogadro's number. If we take one mole of carbon atoms, this is equal to a mass of 1...
TD
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How can potassium form an ionic compound with sulphur?

An ionic compound is formed from positive and negative ions which have balanced and opposite charges.K has 1 electron in it's outer shell. S has 6 electrons in it's outer shell. S needs 2 more electrons to f...
MT
Answered by Molly T. • Chemistry tutor
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Explain why diamond cannot conduct electricity but graphite can.

In the atomic structure of diamond, each carbon is bonded to four other carbons using all of its outer electrons, leaving none free to carry a charge. In graphite not all of the electrons are used in bonding...
LB
Answered by Lucy B. • Chemistry tutor
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