Chemistry Quiz 4

Glass is a supercooled liquid. When glass is made, the material (often containing silica) is quickly cooled from its liquid state but does not solidify when its temperature drops below its melting point. At this stage, the material is a supercooled liquid, an intermediate state between liquid and glass.

A parachute is usually made of a light, strong fabric. Terylene - A type of polyester fabric that is now being used as a material for parachutes as it is very strong and heat resistant.

The long-range potential of nuclear energy in India depends on its reserves of uranium. As of November 2020, 22 reactors – 7382 MWe (gross) – of nuclear capacity were fuelled by indigenous uranium and being operated close to their rated capacity.

The product used for manufacturing of Industrial alcohol is Molasses. Ethanol is the major product obtained from molasses by means of anaerobic fermentation using microorganisms.

Rocket engines and boosters carry both fuel and an oxidizer. For solid fuel, the components are aluminium and ammonium perchlorate. For liquid fuel, the components are liquid hydrogen and liquid oxygen. When combined, the fuels release water, which allows the rocket to leave the ground.

The most abundant inert gas in the atmosphere is Argon (Ar). The most abundant gas in the atmosphere is N₂, which makes up about 78% of air. O₂ is the second most abundant gas at about 21%. The inert gas Ar is the third most abundant gas at 0.93%. There are also trace amounts of CO₂, Ne, He, CH₄, Kr, H₂, NO, Xe, O₃, I₂, CO, and NH₃ in the atmosphere.

Oxalic acid solution is widely used to remove rust stains on cloth. When removing rusts, it converts most insoluble iron compounds into a soluble complex ion.

Ammonium sulphate ((NH₄)₂SO₄) is an inorganic salt with a number of commercial uses. The most common use is as a soil fertilizer since the chemical contains 21% nitrogen and 24% sulphur.

Magnalium is an aluminium alloy with 5% magnesium and 95% aluminium.

Percentage of lead in lead pencils is 0. Lead pencils aren't actually made from lead. It is made of a mixture of graphite and clay. Graphite is the part that makes the dark mark on the paper. The clay is there because graphite on its own is too soft to write.