Chemistry Quiz 5

Aqua Regia (royal water) is used to dissolve noble metals. It is a mixture of nitric acid and hydrochloric acid in a ratio of 1:3. It can dissolve the noble metals gold and platinum, though not all metals.

Hydrolysis is a double decomposition reaction with water as one of the reactants. It is any chemical reaction in which a molecule of water breaks one or more chemical bonds.

Detergents are Sodium salts of sulphonic acids. A detergent is a surfactant with cleansing properties when in dilute solutions. Detergents are the sodium salts of long-chain alkyl hydrogen sulphate or a long chain of benzene sulphonic acid.

Pyrex glass is a variety of heat-resistant glass. Pyrex contains borosilicate and expands only about one-third as much as common glass (silicate) when heated. As a result, it is less apt to break when subjected to rapid temperature changes. Flint glass is optical glass that has relatively high refractive index and low Abbe number.

The gas that is used in the manufacture of vanaspati ghee is hydrogen. Hydrogenation is a process where manufacturers add hydrogen to a liquid fat, such as vegetable oil, to turn it into a solid fat at room temperature.

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.

Cement is usually a mixture of calcium silicate and calcium aluminate. cement is a powdery substance made with calcined lime and clay as major ingredients. The clay used provides silica, alumina, and iron oxide, while calcined lime basically provides calcium oxide.

Freon is a non-combustible gas that is used as a refrigerant in air conditioning applications. It is Dichlorodifluoromethane (CCl₂F₂). Dichlorodifluoromethane is a colourless gas usually sold under the brand name Freon-12.

Electroplating is the process of coating a metal with a thin layer of another metal by electrolysis to improve the metal's corrosion resistance. The metals commonly used for electroplating are nickel, chromium, cadmium, copper, gold, palladium, platinum, ruthenium, silver, tin and zinc.

Inflammable gas is a gas that burns in the presence of an oxidant when provided with a source of ignition. inflammable gasses can include methane, acetylene, ammonia, hydrogen, propane, and propylene. The risk of a fire starting increases in relation to the amount of gas present.