Chemistry Quiz 4

Brass is a metal alloy primarily composed of copper and zinc. The composition of brass is generally 67% copper and 37% zinc. By varying the amount of copper and zinc, brass can be made harder or softer.

A blast furnace is a type of metallurgical furnace used for smelting to produce industrial metals, generally pig iron. Blast furnace slag is a nonmetallic coproduct produced in the process. It consists primarily of silicates, aluminosilicates, and calcium-alumina-silicates.

Hydrogen peroxide is a chemical compound with the formula H₂O₂. It is used as an oxidizer, bleaching agent, and antiseptic. When an old oil painting is coated with hydrogen peroxide, it oxidised lead sulphide to form lead sulphate. The colour of the painting will retain it.

White phosphorus is a highly reactive clement. It is stored underwater for safekeeping to prevent it from catching fire spontaneously in the air. Red phosphorus is more stable than white phosphorus.

Galena is a lead sulfide mineral with a chemical composition of PbS. It is the primary ore of lead and is often mined for its silver content.

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.

Combustion is a chemical process. It is a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.

Ester has a fruity smell due to its volatile nature caused by its chemical composition and conformations. The aroma of an ester is produced when alcohol combines with a carboxylic group (carbon bonded with oxygen atoms). Esters smell partly because they exhibit weak intermolecular forces.

Matter is any substance that has mass and takes up space by having volume. Pure matter can be either Elements or Compounds. Carbon dioxide is a pure matter. Examples of pure matter include carbon, oxygen, iron, table salt and water. Air is a homogeneous mixture. Brass and Steel are alloys, therefore it is a mixture.

The metal, which is a constituent of vitamin B₁₂ is Cobalt. Cyanocobalamin (commonly known as Vitamin B₁₂) is a highly complex, essential vitamin, owing its name to the fact that it contains the mineral, cobalt.