Form 4 Chemistry national exam 2022 with answers
The 2022 Form 4 national exam paper for Form 4 Chemistry, question by question. Take it timed like the real exam, then see the answer and explanation to every question.
- 42 questions, 100 marks
- 120 minutes
Take this paper
120 minutes, 100 marks. Multiple choice is marked for you; you mark your written answers against the marking points.
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Instructions to candidates
Answer all questions in the ANSWER BOOKLET.
PART I: Circle the letter of the correct answer (60 MARKS)
- 13 marks
The chemical elements that make up carbohydrates are
- A.CarBon, hydrogen, nitrogen
- B.Hydrogen, oxygen, phosphor
- C.Sulphur, carbon, hydrogen
- D.Carbon, hydrogen, oxygen.
- 23 marks
Select the functional group of carboxylic acid from the following
- A.R-O-R
- B.R-COOH
- C.R-COOR
- D.R-COR
- 33 marks
An example of an alcohol is
- A.CH3-CH2-C(=O)-CH2-CH
- B.CH3-CH2-CH(OH)-CH3
- C.CH3-CH2-O-CH2-CH2-CH3
- D.CH3-CHO
- 43 marks
Identify in IUPAC the name of this alcohol: HO-CH2-CH(OH)-CH2-OH
- A.1,2,3-propanetriol
- B.1,3-propanediol
- C.1,2,3,4-propanetetriol
- D.1,2,3-butanetriol
- 53 marks
Express the correct answer for the following equilibrium constant. Kc for P4(s) + 6Cl2(g) <=> PCl3(l)
- A.1/[Cl2]^6
- B.2/[Cl2]^6
- C.1/[Cl2]^4
- D.0.5/[Cl2]^6
- 63 marks
Identify the correct name of this organic compound CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-OH;
- A.Octanal
- B.Octanol
- C.Octanone
- D.Octane.
- 73 marks
The Sucrose sugar consists of .......
- A.Glucose and Galactose
- B.Glucose and Lactose
- C.Glucose and Glycogen
- D.Glucose and Fructose
- 83 marks
The nitrogenous base Adenine is always pair with...
- A.Guanine
- B.Thymine
- C.Cytosine
- D.Uracil
- 93 marks
Describe the correct name that implies to this structure: CH2(OH)-CH(Br)-CH(Cl)-CH2-CH2-CH(Cl)-CH3
- A.1-bromo-3,6-dichloro heptanol.
- B.3,6-dichloro heptanol
- C.2-bromo-3,6-trichloro-1-heptanal
- D.2-bromo-3,6-dichloro-1-heptanol
- 103 marks
The RNA molecule is made up;
- A.singlE strand
- B.double helix
- C.Double strand
- D.circular strand
- 113 marks
Which of the following is monosaccharide;
- A.Sucrose
- B.Fructose
- C.Lactose
- D.Glycogen.
- 123 marks
Which of the following indicates the nuclear reaction;
- A.Translocation
- B.Transmutation
- C.Transmission
- D.Translation
- 133 marks
On increasing concentration of one or more reactants, more products will be generated until;
- A.Equilibrium
- B.Expansion
- C.Completion of reaction
- D.Closed system
- 143 marks
The type's reaction in which heat energy absorbed is;
- A.exothermic reaction
- B.equilibrium reaction
- C.endothermic reaction
- D.dynamic reaction
- 153 marks
Select the organic compound from the following;
- A.Na2SO2
- B.K2CO3
- C.CaCl2
- D.C3H7O
- 163 marks
The general formula of alkane is;
- A.CnH2n+2
- B.CnHn+3
- C.CnH2n-1
- D.CnH2n+1
- 173 marks
If one hydrogen atom is removed from the alkane, the formed group is called;
- A.Halo group
- B.FunctioNal group
- C.Alkyl group
- D.Amino group
- 183 marks
Applying the formula (2^(n-4) + 1), the number of possible isomers in pentane is;
- A.2
- B.3
- C.4
- D.5
- 193 marks
Identify the structure corresponding to this name; 2,2-dimethyl pentanal.
- A.CH3-CH(CH3)-CH(CH3)-CH-CH3
- B.CH3-CH2-CH2-C(CH3)2-CHO
- C.CH3-CH2-CH2-C(CH3)2-CH2-OH
- D.CH3-CH(CH3)-CH-CH2-CH3
- 203 marks
Determine the correct answer for the following expression. If the reaction is 4Li(s) + O2(g) -> 2LiO2(s). After 3 minutes, 6 gram of lithium has been used, the rate of reaction will be.
- A.0.4 mol/s
- B.0.5 mol/s
- C.0.0248 mol/s
- D.0.0048 mol/s
PART II: Use the information in the box below to fill the gaps (10 Marks)
Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor
- F11 mark
Aromatic hydrocarbon further classified into _____ (Words in the box: Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor.)
- F21 mark
Structural formula of the organic acid is _____ (Words in the box: Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor.)
- F31 mark
_____ occurs when nuclei combine, split and emit radiations (Words in the box: Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor.)
- F41 mark
Hydrogenation of alkenes (addition of hydrogen) produces _____ (Words in the box: Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor.)
- F51 mark
Structurally, branched chain alkanes consist of two parts, Parent chain and _____ (Words in the box: Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor.)
- F61 mark
Organic chemistry can be defined as the study of _____ (Words in the box: Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor.)
- F71 mark
the substance which allow electric current to follow through it is referred to _____ (Words in the box: Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor.)
- F81 mark
Electrolyte can further be divided into two types strong electrolyte and _____ (Words in the box: Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor.)
- F91 mark
_____ is a substance that dissolves in water to give hydroxide ion (OH-). (Words in the box: Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor.)
- F101 mark
If the Hydroxyl group (-OH) on the chiral carbon in the fisher projection of monosaccharides is on the right, the sugar is referred to as _____ (Words in the box: Carbon compounds, Benzanoid, Nuclear reaction, Non-benzanoid, Alkane, Weak electrolyte, Base, R - COOH, side chain, D- Sugar, Conductor.)
PART III: Answer All of The Following Questions (30 Marks)
Marks per question are not printed; 3 marks each assumed.
- Q1a1.5 marks
Define these terms: a. Functional group
- Q1b1.5 marks
Define these terms: b. Lipids
- Q23 marks
Draw the structural formula of; 2-methyl-1-pentanol.
- Q33 marks
Give IUPAC name for this structure; CH2(OH)-CH(Br)-CH(Cl)-CH(CH3)-CH2-CH3
- Q43 marks
What are the structural difference between DNA and RNA?
- Q53 marks
If the Kc = 1.0, [CO2] = 2.0M, [H2] = 2.0M, [CO] = 1.0M and [H2O] = 1.0M, for the reaction: CO(g) + H2O(g) <=> CO2(g) + H2(g). What is the Q value for this reaction and which direction will the reaction shifts?
- Q63 marks
State types of radioactive particles.
- Q73 marks
Write the equilibrium constant expression (Kc) for the reaction: N2O4(g) <=> 2NO2(g).
- Q8a1.5 marks
Classify the following hydrocarbons into saturated or unsaturated; a. CH2=CH-CH3
- Q8b1.5 marks
Classify the following hydrocarbons into saturated or unsaturated; b. CH3CH2CH2CH2CH3
- Q93 marks
Name and draw the structural formula for the first two members of alkanes.
- Q103 marks
Calculate the PH of hydronium [H3O+] = 2.3 x 10^-2
Paper set by the Federal Ministry of Education, Culture and Higher Education (MoECHE), Somalia. Shared free of charge to help students prepare. The answers and explanations are written by Sheerxirfad teachers.
