Form 4 Chemistry imtixaanka qaranka 2018 iyo jawaabihiisa
Imtixaanka qaranka Fasalka 4aad ee 2018 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.
- 44 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
This paper consists of 12 printed pages. There are 2 sections: PART 1: 20 Multiple Choice Questions (40 marks), PART 2: 10 Structured Questions (60 marks). Answer all questions in the spaces provided. No extra paper is allowed.
PART 1: 20 MULTIPLE CHOICE QUESTIONS (40 MARKS)
For each question in this section, circle the correct answer
- 12 dhibcood
The type of bonding in ethane is:
- A.sp
- B.sp^2
- C.sp^3
- D.dsp^3
- 22 dhibcood
Which of the following organic compounds is saturated?
- A.butene
- B.butane
- C.2-bromopentene
- D.3-ethyl-2-methylpentenced
- 32 dhibcood
Which compound is a structural isomer of the compound shown below? CH3-CH(CH3)-CH3
- A.butane
- B.Methane
- C.pentane
- D.Hexane
- 42 dhibcood
The name of the following structure is: CH3-CH(CH3)-CH2-CH3
- A.3-methylbutane
- B.2-methylpentane
- C.2-methylpropaane
- D.2-methylbutane
- 52 dhibcood
The structure of of 2,2-dibromopropane is;
- A.CH3-CBr2-CH3 (both Br on the middle carbon)
- B.CH2Br-CHBr-CH3
- C.CH3-CHBr-CH2Br
- D.CHBr2-CH2-CH3
- 62 dhibcood
Which formula represents an aromatic compound:
- A.C3H4
- B.C4H10
- C.C6H6
- D.C6H10
- 72 dhibcood
Which of the following is NOT an allotrope of carbon?
- A.diamond
- B.graphite
- C.Backyball
- D.Silicon
- 82 dhibcood
Which of the following compounds is an alcohol?
- A.CH3-O-CH3
- B.CH3-OH
- C.CH3-CHO
- D.CH3-COOH
- 92 dhibcood
To which family of organic compound does CH3 - COOH belong?
- A.Organic acid
- B.Ether
- C.Ketone
- D.Aldehyde
- 102 dhibcood
The general formula of alcohol is:
- A.R-CHO
- B.R-O-R
- C.R-OH
- D.R-COOH
- 112 dhibcood
The name of the compound is CH3-C(=O)-H
- A.propanal
- B.propanone
- C.ethanol
- D.ethanal
- 122 dhibcood
The structural formula of propanoic acid is:
- A.H-COOH
- B.CH3-CH2-COOH
- C.CH3-COOH
- D.CH3-COOCH3
- 132 dhibcood
Amino acids are the building blocks of:
- A.Lipids
- B.proteins
- C.carbohydrates
- D.Vitamins
- 142 dhibcood
The function of lipids in the body is:
- A.growth
- B.functions as catalyst
- C.storage of energy
- D.defence
- 152 dhibcood
Molecular formula of glucose is
- A.C4H6O3
- B.C5H6O5
- C.C3H6O3
- D.C6H12O6
- 162 dhibcood
Oxidation is a process in which electrons are:
- A.lost
- B.gained
- C.shared
- D.accepted
- 172 dhibcood
The oxidation number of nitrogen in HNO3 is
- A.1+
- B.3+
- C.5+
- D.5-
- 182 dhibcood
The oxidation number of an element in its free state is:
- A.0
- B.2+
- C.2+
- D.3+
- 192 dhibcood
In the equation 2Mg + O2 -> 2MgO, the element Mg is
- A.oxidizing agent
- B.reducing agent
- C.electron acceptor
- D.catalyst
- 202 dhibcood
The nuclear notation of Ni is
- A.58 over 28 Ni (mass number 58, atomic number 28)
- B.59 over 28 Ni (mass number 59, atomic number 28)
- C.60 over 29 Ni (mass number 60, atomic number 29)
- D.1 over 7 Ni (mass number 1, atomic number 7)
PART 2: STRUCTURED QUESTIONS (60 MARKS)
- B1a2 dhibcood
QUESTION 1. a) Define alkane.
- B1b2 dhibcood
QUESTION 1. b) What is the difference between alkanes and alkenes? (Insert your differences in the table below: Alkane | Alkene)
- B1c2 dhibcood
QUESTION 1. c) Give two examples of each (alkane and alkene).
- B2a2 dhibcood
QUESTION 2. Draw the structures of the following compounds. 2-methylbutene
- B2b2 dhibcood
QUESTION 2. Draw the structures of the following compounds. 2-iodopentane
- B2c2 dhibcood
QUESTION 2. Draw the structures of the following compounds. 3-bromobenzene
- B3a2 dhibcood
3. a) Define aromaticity
- B3b2 dhibcood
3. b) Draw the structure of of 1,2-dimethylbenzene
- B3c2 dhibcood
3. c) Name the following compound. [A benzene ring with an NO2 group attached.]
- B4a3 dhibcood
4. a) What is an isomer?
- B4b3 dhibcood
4. b) Draw the three isomers of pentane
- B5a2 dhibcood
5. a) Define alcohols
- B5b4 dhibcood
5. b) What is the difference between primary alcohols and secondary alcohols
- B66 dhibcood
6. Fill in the blanks in the following table (columns: Compound, General formula, Functional Group). Row 1: Ketone, _____, _____. Row 2: _____, R-CHO, _____. Row 3: _____, _____, -COOH.
- B7a2 dhibcood
7. a) What is the general formula of ethers?
- B7b2 dhibcood
7. b) Name the following two ethers: i) CH3-O-CH3 ii) C2H5-O-CH3
- B7c2 dhibcood
7. c) What are the uses of ethers?
- B8a3 dhibcood
8) a) What are the three types of lipids?
- B8b3 dhibcood
8) b) State the functions of phospholipids?
- B9a2 dhibcood
9. a) Name the three different categories of carbohydrates.
- B9b2 dhibcood
9. b) Complete and balance the following equation. C6H12O6 (Glucose) + C6H12O6 (Fructose) ->
- B9c2 dhibcood
9. c) What is the difference between glucose and fructose?
- B10a3 dhibcood
10. a) Define chemical equilibrium.
- B10b3 dhibcood
10. b) State the three reaction possibilities of a reaction.
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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