12 questions in Air, water and the environment at Form 5 · BGCSE
Most triedMost missedNewest- About what percentage of air is nitrogen?
- Which test shows that a liquid is water?
- Acid rain is mainly caused by…
- Water containing dissolved carbon dioxide reacts with limestone, CaCO₃, forming hard water as shown by the equation. H₂O(l) + CO₂(g) + CaCO₃(s) → Ca(…
- Nitrogen dioxide is one of the pollutants found in car exhaust fumes.
- Pollutant gases such as carbon monoxide and oxides of nitrogen are produced by a car engine and are emitted through the exhaust pipe.
- Carbon dioxide, nitrogen and oxygen are all present in clean air.
- A student is given two samples of water: pure water, labelled Y, and rain water containing dissolved calcium hydrogencarbonate, labelled Z.
- Carbon monoxide is a poisonous gas emitted from car exhausts. It can be detected using the reaction: CO + Pd²⁺ (orange) + H₂O → CO₂ + Pd (black) + 2H…
- A sample of water from a limestone area needed a large quantity of soap to form lather. After heating, the same amount of the sample formed lather ea…
- The increasing number of vehicles in cities like Gaborone add several pollutants to clean air from their exhausts.
- The flow chart shows a method of liquefying air: air → fine filtering → pass through potassium hydroxide → pass through anhydrous calcium chloride → …