Chemistry · May / June 2020 · Paper 41 · Question 2
0620
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Magnesium is a metal.
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2(a)[4]
metallic (bonding)
sea of electrons
positive ions
attraction between
2(b)(i)[3]
Mg octet of eight dots
O octet of six crosses and two dots.
correct charges on both ions
2(b)(ii)[2]
2Mg + O2 → 2MgO
M1 species
M2 balancing
2(c)(i)[2]
2Mg(NO3)2 → 2MgO + 4NO2 + O2
M1 product species
M2 balancing
2(c)(ii)[1]
(thermal) decomposition
2(c)(iii)[2]
magnesium carbonate
magnesium hydroxide
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