Oxides of carbon
Answers are for parents and teachers.
1
Balance CO + O₂ → CO₂; how does carbon's oxidation state change?
2CO + O₂ → 2CO₂; C goes from +2 to +4 (it is oxidised).
2
How many grams of iron come from reducing 80 g Fe₂O₃ with CO? (Fe₂O₃ + 3CO → 2Fe + 3CO₂)
56
3
What rules prevent carbon monoxide poisoning in a house with a coal stove?
Check the chimney, ventilate the room, do not leave the stove closed overnight, and let adults handle it.
4
Write the reactions CaO + CO₂ and 2KOH + CO₂.
CaO + CO₂ → CaCO₃; 2KOH + CO₂ → K₂CO₃ + H₂O.
5
Why can CO₂ collect in low places such as deep pits?
It is heavier than air (44 vs about 29 g/mol), so it sinks; nobody should go into such places alone.