Chemistry WAEC GCE 2022
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The West African Examination Council (WAEC) Has Scheduled The Waec GCE Chemistry 2022 Paper To Kick Of today 13th December 2022 by 9:30am.
This brings the attention of candidates writing the exam in to searching for Chemistry WAEC GCE 2022, Waec gce chemistry 2022, Waec gce chemistry expo 2022, Waec gce chemistry question 2022, Waec gce chemistry answer 2022, Waec chemistry 2022 and etc.
Chemistry WAEC GCE 2022
In this section, you will read the steps and requirements needed for you to get Chemistry WAEC GCE 2022 Questions And Answers before exam.
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(1a)
A solution of ammonia is basic, hence it turns red litmes blue.
(1bi)
Methylmethanoate.
(1bii)
A catalyst, concentrated tetraoxosulphate(vi) acid must be used to speed up the reaction.
(1ci)
CaC₂(s) + H₂0(l) —> C₂H₂(g) + CaO(s)
(1cii)
It is used in the production of oxy-acetylene flame used for welding.
(1d)
(i) Motarity
(ii) Masses
(iii) Saturation level.
(1e)
(i) Rusting requires moisture but burning does not.
(ii) Burning requires heat while rusting does not.
(1fi)
The K₂Cr₂O7 is reduced.
(1fii)
Hydrogen gas is geven off with the formation of iron(11) Chloride (green).
(1gi)
(i) Carbon(1V)Oxide, CO₂
(ii) Steam,
(iii) Heat energy
(1gii)
CxHy + (x + Y/A) —-> xC0₂ + y/₂ H₂0.
CH4 + 20₂ —-> CO₂ + 2H₂0
(1h)
Law of constant composition which states that equal volumes of all gases contain equal quantities of Particles at constant temperature and pressure.
(4ai)
(i) Carbon : A filter with granular activated Carbon is used to remove Certain chemical mostly Organic chemicals from water Carbon is used to remove com chemicals which gives Odors or taste to the water Such as Hydrogen Sulfide.
(ii) chlorine is added to water during treatment in order to kill Parasites bacterias and Viruses and the Process a Called chlorination
(4aii)
(i)Sedimentation: Sedimentation is one of the steps water treatment plants use to separate out solids from the water. During sedimentation, flocs settle to the bottom of the water because they are heavier than water.
(ii)Filtration: Once the flocs have settled to the bottom of the water, the clear water on top is filtered to separate additional solids from the water. During filtration, the clear water passes through filters that have different pore sizes and are made of different materials (such as sand, gravel, and charcoal).
(iii) Disinfection: After the water has been filtered, water treatment plants may add one or more chemical disinfectants (such as chlorine, chloramine, or chlorine dioxide) to kill any remaining parasites, bacteria, or viruses.
(4bi)
When humans burn fossil fuels, sulfur dioxide (SO2) and nitrogen oxides (NOx) are released into the atmosphere. Those air pollutants react with water, oxygen, and other substances to form airborne sulfuric and nitric acid. Winds may spread these acidic compounds through the atmosphere and over hundreds of miles.
(4bii)
When acid rain and dry acidic particles fall to earth, the nitric and sulfuric acid that make the particles acidic can land on statues, buildings, and other manmade structures, and damage their surfaces.
(4ci)
Allotropy is defined as the existence of an element in two or more forms in the same physical state.
CHEMISTRY OBJ
1-10: DABBBBABDC
11-20: BADBCCACAC
21-30: BAACBACAAA
31-40: BDADBAACBA
41-50: BACCBBACBC
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