The carbon group. Carbon
Answers are for parents and teachers.
1
Find the oxidation states of carbon in CO, CO₂ and CaC₂.
CO: +2; CO₂: +4; CaC₂: –1 (Ca +2, 2x = –2).
2
Why is activated carbon a better adsorbent than ordinary charcoal?
Steam treatment clears its pores and greatly increases the absorbing surface.
3
Balance Fe₂O₃ + C → Fe + CO₂.
2Fe₂O₃ + 3C → 4Fe + 3CO₂↑
4
How many moles of CO₂ form when 48 g of carbon burns?
4
5
Why is burning coal in a closed room dangerous? What rule should be followed at home?
CO forms and binds hemoglobin, causing poisoning; only adults should operate stoves, and rooms must be ventilated.