Chemistry Quiz 3

The fuel used in an atomic reactor is Uranium. Uranium is the most widely used fuel by nuclear power plants for nuclear fission.

Excessive exposure to polycyclic aromatic hydrocarbons (PAHs) often results in lung cancer.

Calcium carbide (CaC₂) reacts with water to give acetylene (IUPAC name ethyne) gas and calcium hydroxide. CaC₂+2H₂O→Ca(OH)₂+C₂H₂(acetylene)

Pyroligneous acid, also called wood vinegar or wood acid, is a dark liquid produced by the destructive distillation of wood and other plant materials. The principal components of pyroligneous acid are 10% acetic acid, acetone and methanol.

Graphite is used in pencil lead because it is soft and leaves an impression on the paper and cleans easily between the layers. It has layered structure layers are held by van der Waal forces.

Oxalic acid is manufactured using sawdust. The heating of sawdust with Potassium hydroxide (KOH) results in the production of oxalic acid.

Aqua regia (royal water) is a mixture of concentrated nitric and hydrochloric acids, usually one part of the former to three parts of the latter by volume. This mixture was given its name by the alchemists because of its ability to dissolve gold. It is a red or yellowish liquid.

The gas used in the artificial ripening of fruits is Acetylene (C₂H₂). Calcium carbide (CaC₂) is used for artificially ripening fruit. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is similar in its effects to the natural ripening agent, ethylene. Note: ethylene (C₂H₄) is the natural ripening agent of plants.

Acetic acid (CH₃COOH) is the chemical name of vinegar. A dilute solution of acetic acid produced by fermentation and oxidation of natural carbohydrates is called vinegar; a salt, ester, or acylal of acetic acid is called acetate.

Amorphous silica and Carbon black are used as fillers in the tyre of rubber. Their presence in rubber is essential to achieve longer‐wearing products, increased tyre strength and longevity.