Chemistry Quiz 2

¹⁴C₆ is used in dating archaeological findings up to about 60,000 years old. Radiocarbon dating (carbon-14 dating) is a method used for dating archaeological findings by using the properties of radiocarbon (¹⁴C₆), a radioactive isotope of carbon.

Mercury vapour and argon is the most commonly used substance in fluorescent tubes. A tube is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. Argon gas is used in fluorescent tubes to stop the oxygen from corroding the hot tungsten filament.

Carbon dioxide is a major greenhouse gas. Earth's greenhouse gases trap heat in the atmosphere and warm the planet. The main gases responsible for the greenhouse effect include carbon dioxide, methane, nitrous oxide, and water vapor (which all occur naturally), and fluorinated gases (which are synthetic).

Gypsum is a mineral and is hydrated calcium sulphate in chemical form. It slows down the hydration process of cement once it is mixed with water. It is mainly used for preventing the rapid setting of cement.

Aspirin is chemically known as acetylsalicylic acid. It is a common drug for relieving minor aches, pains, and fevers. People also use it as an anti-inflammatory or a blood thinner.

The density of a gas is directly proportional to pressure and indirectly proportional to temperature. Thus, the density of a gas is maximum at low temperature and high pressure.

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.

Caesium is a chemical element with the symbol Cs and atomic number 55. It is a soft, silvery-golden alkali metal. Caesium ionizes easily when heated or exposed to light because it is strongly photoelectric (easily loses electrons when struck by light). Cesium 133 is the element most commonly chosen for atomic clocks.

Ammonal is an explosive made up of aluminium powder and ammonium nitrate. The mixture is often referred to as Tannerite, which is a brand of ammonal.

Vulcanization of rubber is carried out by adding Sulphur. It is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulphur, which results in three-dimensional cross-linking of the chain rubber molecules (polyisoprene) bonded to each other by sulphur atoms.