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nydimaria [60]
3 years ago
7

Which of the following represents an ion? a 4he b Na 2+ c Ca d Mg

Chemistry
1 answer:
liubo4ka [24]3 years ago
7 0

Na2+(answer  B)  represent ions.


<h3>Explanation</h3>

This is because it has a charge of 2+. ion is formed when an  atom gain or lose  electrons.  when an atom lose electrons it form ion which is positively  charged . On the other hand when atom gain electrons it forms ion of negatively charged. Na2+  has a charge of 2+ since it loses two electrons.

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3 years ago
Ethanol is added to gasoline because the oxygen it contains improves gasoline's burning efficiency. Its combustion reaction is g
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Answer:

A) Exothermic

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C) The molar mass of water is 18 g/mol, so the number of moles at 42.7 g is:

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5 0
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Answer:

See explaination

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Please kindly check attachment for the step by step solution of the given problem.

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