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Teachers Notes: Problem 1:
2Mg(s) + O2(g) → 2MgO(s), synthesis reaction
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Problem 2:
3Mg(s) + N2(g) → Mg3N2(s), synthesis reaction
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Problem 3:
2 Mg(s) + CO2(s) → 2 MgO(s) + C(s), single-replacement reaction
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Problem 4:
Mg(s) + H2O(g) → MgO(s) + H2(g) , single-replacement reaction
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Problem 5:
No water should be used to put out a magnesium fire. When heated water becomes steam, which reacts with magnesium producing hydrogen. The hydrogen can explode and produce balls of fire.
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Problem 6:
No a carbon dioxide fire extinguished would not work because
magnesium still burns in the presence of carbon dioxide.
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Problem 7:
MgCl2 (s) → Mg (s) + Cl2(g), decomposition
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