Chemistry Quiz 2

Mortar is a material used in building construction to bond brick, stone, tile, or concrete blocks into a structure. It is a mixture of water, sand and slaked lime. Slaked lime (Hydrated lime) formed by adding quick lime and water gives a slurry material.

Soap is prepared by boiling caustic soda with Fats. Soap is prepared by hydrolyzing fat under alkaline (basic) conditions. The reaction is called saponification, and produces one molecule of glycerin and three molecules of soap, for each molecule of fat taken.

All steel contains at least some amount of carbon. After all, steel is defined as an alloy of iron and carbon. By adding carbon to it, the metal becomes stronger and harder. The percentage of carbon in steel ranges from 0.1 to 2. Depending on the carbon percentage, steel is classified into mild steel (0.02–0.05%), medium-carbon steel (0.05–1%) and high-carbon steel (1–2%).

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

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

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.

Most iron is found in minerals formed by the combination of iron with other elements. The purest form of iron is Wrought iron. It contain 99.5% iron, 0.25% carbon and 0.25% other impurities.

Chromium is a toxic heavy metal which is found in modern tannery industries.

Tetraethyllead (TEL) is an antiknock compound with the formula Pb(C₂H₅)₄. An antiknock agent is a gasoline additive used to reduce engine knocking and increase the fuel's octane rating by raising the temperature and pressure at which auto-ignition occurs.

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