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Explain the trend in reactivity of the elements in Group 7.

The Halogens decrease in reactivity as you descend through the group. The atoms increase in size and Mr as you go down the group. Therefore their outer electrons are further away from the positive charge of ...
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Answered by Kirsten S. • Chemistry tutor
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In terms of electrons, what happens when magnesium atoms react with oxygen atoms to produce magnesium oxide?

Magnesium loses two electrons which are transferred to the oxygen atom (so oxygen gains two electrons). In this way, both magnesium and oxygen will acheive a stable full outer shell of electrons. The electro...
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Answered by Reka K. • Chemistry tutor
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What is an isotope?

Atoms of the same element with different numbers of neutrons
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Answered by Bella S. • Chemistry tutor
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How many moles are in 6g of carbon?

moles = mass/mrn = 6/12n= 0.5
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Answered by Lucy O. • Chemistry tutor
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Magnesium reacts with hydrochloric acid to form a salt. What volume of 0.2dm(-3) HCL is required to react with 4g of Magnesium? Give answer in cm(3).

First draw out the equation. Mg + HCL = MgCl 2 + H 2 Now balance this equation Mg + 2HCl = MgCl 2 + H 2 Next we need to work out the moles of Mg. We know that we have 4g and Mg has a molar mass of 24. Mass/m...
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Answered by Katie C. • Chemistry tutor
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