Chemistry Quiz 6

H₂ will effuse out of the football bladder most quickly. The rate of effusion for a gas is inversely proportional to the square root of its molecular mass (Graham's Law). The gas with the lowest molecular weight will effuse the fastest. here H₂ is The lightest, hence it effuses fastest.

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.

Zinc is used to galvanise iron. Galvanizing is a process of coating iron or steel with zinc in order to provide greater protection against corrosion for the iron or steel base.

Oxygen is the most abundant element in the human body accounting for approximately 65% of a person's mass. Each water molecule consists of two hydrogen atoms bonded to one oxygen atom, but the mass of each oxygen atom is much higher than the combined mass of the hydrogen.

The mercury and sodium street lamps light up because of atomic emission. An electric discharge takes place when electricity is passed through sodium vapors at low or high pressure. As a result, the valence electron present in sodium atoms becomes excited and emits light. The mercury vapor lamp works by creating an electric current to mercury vapor within a sealed glass jacket.

The process involved in the industrial production of vegetable ghee is reduction. Vegetable ghee is made from cooking oil by hydrogenation. Hydrogenation reaction of unsaturated fatty acids is basically the reaction where the hydrogen gets added in the double bond of the alkene or alkyne in presence of nickel. Nickel acts like a catalyst in solid-state.

Hard steel contains 0.5 to 1.5 percent carbon. Typically there is less than 0.40% carbon in most steels, though it is possible to have as much as 2%. Once the carbon content exceeds 0.65%, additional carbon can enhance the steel's hardenability and improve performance.

Water can lie separated from alcohol-water mixture by fractional distillation. This technique relies on the fact that the compounds in the mixture have different boiling points. Since ethanol boils at a lower temperature (78.5°C) than water, the alcohol vaporizes while most of the water remains a liquid.

Melamine (C₃H₆N₆) is a polymer used in making plastic crockery. Melamine is used for making crockery because it resists fire and can tolerate heat better than other plastics.

Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. It can be removed by using a water softener which works on the principle of ion exchange in which calcium and magnesium ions are exchanged with sodium or potassium ions, reducing the concentration of hardness minerals to tolerable levels.