Chemistry Questions and Answers

Rust is an iron oxide, a usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.

To purify the distillate of impurities like unreacted ethanol, acids, water and ethoxyethane.

Adding anhydrous calcium chloride and leave it to stand for a day to remove any water present

in the mixture.

Resonance involves two forms of a compound.
Isomerism involves two or more forms of an element.
Reforming involves the rearrangement of molecule.

This deals with a two forms of a molecule where the chemical connectivity is the same but the electrons are distributed differently around the structure.

H₂CO₃ is an example of a weak acid while H₂SO₄ and HNO₃ are examples of a strong acid.

CO₂ combines with water to give a weak trioxocarbonate (IV) acid.

CO₂ + H₂O → H₂CO₃

Permanent hardness in water= Mg & Ca Sulphate.
Temporary hardness in water= Mg & Ca Carbonate.

Temporary hardness of water is caused by Magnesium and calcium hydrogencarbonate. It is formed when rainwater containing dissolved CO₂ flows over deposit of CaCO₃

i.e CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂

It is also called weak iodine solution. Tincture solutions are characterized by the presence of alcohol.

Aluminium hydroxide is used in the dyeing industry as a mordant. It combines with a dye and thereby fixes it in a material.

The shape of the S-orbital is spherical.

Constituents of duralumin are: Al, Cu, Mg, Mn.
Constituents of Alnico are: Al, Ni and Co

In 1909, the alloy of duralumin was discovered by Alfred Wilon consisting of 94% Al, 4% Cu, 1% Mg and 1% Mn(Manganese)
Alnico is an acronym referring to a family of iron alloys which in addition to iron are composed primarily of Al, Ni and Co.

Alkanones also known as ketones have the general formula RCOR'