Point 6 of 6 — The Greenhouse Effect, the Carbon Footprint and Sustainable SolutionsQuestion bank: 0 questions (0 with pictures)
06Worked examples
Why does CO₂ absorb infrared while N₂ does not? — CO₂ is a linear molecule whose asymmetric stretch and bending change its dipole moment, so it interacts with the radiation; N₂ is symmetric homonuclear and its vibration produces no dipole change.
A country produces 12 million tonnes of cement. With about 0.8 t CO₂ per tonne of clinker, estimate the process emission. — ≈ 9.6 Mt CO₂, mostly from calcination, not from fuel.
A family replaces 40 halogen bulbs of 60 W by 9 W LEDs running 5 h a day. Find the annual cut if the grid emits 0.45 kg CO₂/kWh. — Saving = 40 × 51 W × 5 h × 365 = 372 kWh ⟹ ≈167 kg CO₂ a year.
Explain how melting Arctic sea ice accelerates warming. — Bright ice reflects most sunlight; when it is replaced by dark ocean, absorption rises, the water warms, more ice melts — apositive albedo feedback.
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