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Form 4 Chemistry imtixaanka qaranka 2022 iyo jawaabihiisa

Imtixaanka qaranka Fasalka 4aad ee 2022 ee Form 4 Chemistry, su'aal su'aal. Ku gal adigoo waqti leh sida imtixaanka dhabta ah, kadibna arag jawaabta iyo sharaxa su'aal kasta.

42 su'aalood, 100 dhibcood
120 daqiiqo

Gal imtixaankan

120 daqiiqo, 100 dhibcood. Su'aalaha doorashada waa laguu saxayaa; jawaabaha qoraalka adiga ayaa ku saxaya qodobada sixitaanka.

Akoon bilaash ah ayaa loo baahan yahay si aad u bilowdo, si jawaabahaaga iyo natiijooyinkaaga loo kaydiyo.

Tilmaamaha ardayga

Answer all questions in the ANSWER BOOKLET.

PART I: Circle the letter of the correct answer (60 MARKS)

1
The chemical elements that make up carbohydrates are
- A.CarBon, hydrogen, nitrogen
- B.Hydrogen, oxygen, phosphor
- C.Sulphur, carbon, hydrogen
- D.Carbon, hydrogen, oxygen.
3 dhibcood
2
Select the functional group of carboxylic acid from the following
- A.R-O-R
- B.R-COOH
- C.R-COOR
- D.R-COR
3 dhibcood
3
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
3 dhibcood
4
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
3 dhibcood
5
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
3 dhibcood
6
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.
3 dhibcood
7
The Sucrose sugar consists of .......
- A.Glucose and Galactose
- B.Glucose and Lactose
- C.Glucose and Glycogen
- D.Glucose and Fructose
3 dhibcood
8
The nitrogenous base Adenine is always pair with...
- A.Guanine
- B.Thymine
- C.Cytosine
- D.Uracil
3 dhibcood
9
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
3 dhibcood
10
The RNA molecule is made up;
- A.singlE strand
- B.double helix
- C.Double strand
- D.circular strand
3 dhibcood
11
Which of the following is monosaccharide;
- A.Sucrose
- B.Fructose
- C.Lactose
- D.Glycogen.
3 dhibcood
12
Which of the following indicates the nuclear reaction;
- A.Translocation
- B.Transmutation
- C.Transmission
- D.Translation
3 dhibcood
13
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
3 dhibcood
14
The type's reaction in which heat energy absorbed is;
- A.exothermic reaction
- B.equilibrium reaction
- C.endothermic reaction
- D.dynamic reaction
3 dhibcood
15
Select the organic compound from the following;
- A.Na2SO2
- B.K2CO3
- C.CaCl2
- D.C3H7O
3 dhibcood
16
The general formula of alkane is;
- A.CnH2n+2
- B.CnHn+3
- C.CnH2n-1
- D.CnH2n+1
3 dhibcood
17
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
3 dhibcood
18
Applying the formula (2^(n-4) + 1), the number of possible isomers in pentane is;
- A.2
- B.3
- C.4
- D.5
3 dhibcood
19
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
3 dhibcood
20
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
3 dhibcood

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

F1
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.)
1 dhibcood
F2
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.)
1 dhibcood
F3
_____ 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.)
1 dhibcood
F4
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.)
1 dhibcood
F5
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.)
1 dhibcood
F6
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.)
1 dhibcood
F7
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.)
1 dhibcood
F8
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.)
1 dhibcood
F9
_____ 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.)
1 dhibcood
F10
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.)
1 dhibcood

PART III: Answer All of The Following Questions (30 Marks)

Marks per question are not printed; 3 marks each assumed.

Q1a
Define these terms: a. Functional group
1.5 dhibcood
Q1b
Define these terms: b. Lipids
1.5 dhibcood
Q2
Draw the structural formula of; 2-methyl-1-pentanol.
3 dhibcood
Q3
Give IUPAC name for this structure; CH2(OH)-CH(Br)-CH(Cl)-CH(CH3)-CH2-CH3
3 dhibcood
Q4
What are the structural difference between DNA and RNA?
3 dhibcood
Q5
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?
3 dhibcood
Q6
State types of radioactive particles.
3 dhibcood
Q7
Write the equilibrium constant expression (Kc) for the reaction: N2O4(g) <=> 2NO2(g).
3 dhibcood
Q8a
Classify the following hydrocarbons into saturated or unsaturated; a. CH2=CH-CH3
1.5 dhibcood
Q8b
Classify the following hydrocarbons into saturated or unsaturated; b. CH3CH2CH2CH2CH3
1.5 dhibcood
Q9
Name and draw the structural formula for the first two members of alkanes.
3 dhibcood
Q10
Calculate the PH of hydronium [H3O+] = 2.3 x 10^-2
3 dhibcood

Imtixaanka waxaa diyaarisay Federal Ministry of Education, Culture and Higher Education (MoECHE), Somalia. Waxaa lagu wadaagay bilaash si ardaydu ugu diyaargaroobaan. Jawaabaha iyo sharaxyada waxaa qoray macallimiinta Sheerxirfad.

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