Chemistry Neco Answers 2022

1a

i. ammonium iron(II) sulfate

ii. NaCl

aii) Loading…

bi)

The liquid air undergoes a process called fractional distillation. Fractional distillation uses the different boiling points of the main elements of air. As the liquid air is heated, the elements change from liquid to gas and separate from one another. Pump air through a filter to remove dust and other contaminants.

ii)

1. production of steel, plastics and textiles

2. rocket propellant

iii)

If the room is closed, all vapor generated by boiling will stay in the room, If it is at constant volume, the pressure will rise in it.

iv)

1. Phenol Red

2. Methyl Orange

ci)

An ion is an atom or group of atoms that carries a positive or negative electric charge as a result of having lost or gained one or more electrons.

ii)

HCI gas does not conduct electricity, but hydrochloric acid conducts electricity because in hydrochloric acid( aq), hydrogen ions are present to facilitate the movement of electrons whereas no such medium is present in gas

iii)

I. Noble Gases: Helium,Neon

II. Halogens: Flourine,Iodine

III. Alkaline earth metals: Magnesium,Calcium

iv)

They form bonds like those in the chlorine molecule: one single bond between atoms and three lone pairs of electrons per atom.

di)

Sol is a colloid (aggregate of very fine particles dispersed in a continuous medium) in which the particles are solid and the dispersion medium is fluid.

ii)Gel

iii)

1. To determine the acid solution concentration by titrating it with a basic solution of known concentration, or vice versa until there is neutralization.

2. To analyse the purity of medicines.

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