Protecting the atmosphere and hydrosphere
Answers are for parents and teachers.
1
Write the equation for the formation of nitric acid from NO₂.
4NO₂ + O₂ + 2H₂O → 4HNO₃
2
3000 kg of coal contains 3 % S. How many kg of SO₂ form on burning? (A(S) = 32, M(SO₂) = 64)
180
3
Why is CaCO₃ (limestone) destroyed by acid rain? Write the equation.
Acid reacts with the carbonate: CaCO₃ + H₂SO₄ → CaSO₄ + H₂O + CO₂↑.
4
Write three things you can do at home to save water and avoid polluting it.
Turn off the tap; do not pour waste and chemicals into water; use detergents in moderation.
5
Write the formulas of four gases that pollute the atmosphere.
SO₂, NO₂, CO, H₂S