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Form 4 Chemistry imtixaanka qaranka 2024/2025 iyo jawaabihiisa

Imtixaanka qaranka Fasalka 4aad ee 2024/2025 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.

69 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. Read each question carefully before answering. Write your answers on the exam paper. Time: 2 hours.

SECTION A: Circle the Correct Answer (40 Marks)

1
Which branch of science relates to all branches of science?
- A.Physics
- B.Geography
- C.Biology
- D.Chemistry
1 dhibcood
2
Which one of the following compounds has the maximum number of hydrogen atom
- A.Butene
- B.Butyl
- C.Butane
- D.Buytne
1 dhibcood
3
Which part of the atmosphere contains the ozone (O3) layer?
- A.Troposphere
- B.Stratosphere
- C.Thermosphere
- D.Mesosphere
1 dhibcood
4
The molar mass of CaCO3 given atomic mass of (Ca = 40 C = 12 O = 16)
- A.98 g/mole
- B.89 g/mole
- C.101 g/mole
- D.100 g/mole
1 dhibcood
5
The figure below states a change of state of matter. What process occurs the part labeled at X
- A.Condensation
- B.Melting
- C.Evaporation
- D.Freezing
1 dhibcood
6
Which of the following does NOT belong to conditions for a reaction to occur?
- A.Collision
- B.Power
- C.Energy
- D.Orientation
1 dhibcood
7
The IUPAC name for product formed when CH3-CH2-CH2-O-K + CH3-CH2-Br is
- A.Ethoxy ethane
- B.Methoxy ethane
- C.Ethoxy propane
- D.Methoxy propane
1 dhibcood
8
The PH of a solution was determined to be 3.5, The [H3O+] ion of that solution is:
- A.1.5 × 10^-4 M
- B.3.2 × 10^-4 M
- C.5.1 × 10^-4 M
- D.2.3 × 10^-4 M
1 dhibcood
9
The horizontal rows of the periodic table
- A.Triad
- B.Group
- C.Trends
- D.period
1 dhibcood
10
The figure below represent the structural formula of glucose, it has molecular formula C6H12O6, what will be its configuration
- A.α -sugar
- B.D- sugar
- C.β -sugar
- D.L-sugar
1 dhibcood
11
The figure below show that the penetrating ability of radioactive emissions by using the detector labeled part at Z is
- A.Alpha
- B.Beta
- C.Gamma
- D.Neutron
1 dhibcood
12
The chemical formula of aluminum sulphate is
- A.Al2 SO4
- B.Al3 SO4
- C.Al2(SO4)3
- D.Al SO4
1 dhibcood
13
If a nucleotide was obtained to have 30% of adenine nucleotides, how many guanine will have
- A.40%
- B.10%
- C.30%
- D.20%
1 dhibcood
14
The quantity of electricity requires to deposit one mole of Magnesium ion
- A.1 F
- B.2F
- C.3F
- D.4F
1 dhibcood
15
Which one of the following changes will increase the rate of chemical reaction
- A.Decrease temperature
- B.Removing of catalyst
- C.Increase temperature
- D.Decreasing amount of reactant
1 dhibcood
16
A Student has balloons filled with three different gases. The symbols for the gas inside are written on each balloon. To which group of the periodic table do the gases belong? (The balloons show He, Ar and Ne.)
- A.Group 5
- B.Group 6
- C.Group 7
- D.Group 8
1 dhibcood
17
By the evaluating the molecular weight of the below alcohols, which alcohol has the highest boiling point
- A.Pentanol
- B.butanol
- C.propanol
- D.methanol
1 dhibcood
18
Which carbon allotrope represent by the picture below
- A.Diamond
- B.Bucky ball
- C.Graphite
- D.Giant
1 dhibcood
19
The chemical symbol of Tungsten is
- A.Tg
- B.Tn
- C.W
- D.M
1 dhibcood
20
The reaction below shows a reaction at equilibrium. HCl(g) + NaOH(aq) ⇌ NaCl(aq) + H2O(l). Find the equilibrium constant Kc and then analyze the direction which shift the reaction if their concentrations are [HCl] = 3.2M [NaOH] = 4.3m [NaCl] = 6M and [H2O] = 2M
- A.0.22 left
- B.0.44 right
- C.0.22right
- D.0.44 left
1 dhibcood
21
The structures below states that some organic compounds, which structure illustrates carboxylic acid
- A.Structure A
- B.Structure B
- C.Structure C
- D.Structure D
1 dhibcood
22
How many electrons are shared to form a double bond?
- A.8
- B.8
- C.4
- D.2
1 dhibcood
23
Calculate the oxidation number of Sulfur in H2SO4
- A.+6
- B.+8
- C.-8
- D.-6
1 dhibcood
24
The reaction between carboxylic acid and alcohol is called _____
- A.Neutralization
- B.Radiation
- C.Esterification
- D.Precipitation
1 dhibcood
25
If C2H4 reacts with HBr. What is the molecular formula of the product?
- A.C2H3Br
- B.C2H2Br
- C.C2H4Br
- D.C2H5Br
1 dhibcood
26
When salt is added to water, a solution is formed as shown in the diagram below. What term is used to describe the water
- A.Solute
- B.Solvent
- C.Salination
- D.Saponificatin
1 dhibcood
27
All are conditions required the chemical reaction to reach the equilibrium state EXCEPT
- A.Open system
- B.Closed system
- C.Constant Temperature
- D.Equal rates both directions
1 dhibcood
28
The structure of a common household substance is given below:
- A.C6H7Cl
- B.C8H8Cl
- C.C8H9Cl
- D.C7H8Cl
1 dhibcood
29
What is the valence electron configuration of group 15?
- A.ns^2np^2
- B.ns^2np^1
- C.ns^2np^4
- D.ns^2np^3
1 dhibcood
30
The expression of equilibrium concentrations for a reaction below is: 2SO2(g) + 3O2(g) ⇌ 2SO3(g)
1 dhibcood
31
The table below shows compounds A to E, where R represents a CH3 group and R' represents a C2H5 group. Which structures are alcohols
- A.Structure B and C
- B.Structure D and E
- C.Structure A and C
- D.Structure C and E
1 dhibcood
32
Organic compounds which contain oxy (- O -) as a functional group.
- A.Alcohol
- B.Phenol
- C.Ether
- D.ester
1 dhibcood
33
The splitting of the nucleus of an atom into lighter nucleus
- A.Nuclear fusion
- B.Nuclear fission
- C.Decay
- D.Half life
1 dhibcood
34
The number of possible isomers for octane with molecular formula of (C8H18)
- A.5
- B.9
- C.18
- D.35
1 dhibcood
35
235/92 U + 1/0 n → x/30 Z + 160/y Sn + 4(1/0 n). The value of X in the nuclear equation above is
- A.72
- B.27
- C.173
- D.137
1 dhibcood
36
Which of the following elements belong to Alkali metal elements
- A.Barium
- B.Cesium
- C.Calcium
- D.Radium
1 dhibcood
37
The mechanism of this reaction consists two elementary steps: step 1: 2NO(g) + O2(g) → N2O2(g); step 2: N2O2(g) + O2(g) → 2NO2(g). The intermediate species that appears in the mechanism of reaction is
- A.NO2
- B.N2O
- C.NO
- D.N2O2
1 dhibcood
38
Which of the following is an example of exothermic reactions?
- A.Decomposing of stone
- B.Heating of butter
- C.Explosion
- D.Evaporation
1 dhibcood
39
The isotope shown 218/84 Po determine its number of neutrons
- A.134
- B.84
- C.218
- D.136
1 dhibcood
40
The diagram below shows a section of periodic table and symbols of first 20 elements. Which two elements belongs to group 13 elements
- A.Li and Be
- B.B and Al
- C.O and S
- D.K and C
1 dhibcood

SECTION B: Structured Questions (60 Marks)

41a
The diagram shows a reaction sequence: butane → (X) → ethene → (Y) → ethanol → (Z) → carbon dioxide and water. Name the processes labeled at: a) Y
3 dhibcood
41b
The diagram shows a reaction sequence: butane → (X) → ethene → (Y) → ethanol → (Z) → carbon dioxide and water. Name the processes labeled at: b) Z
3 dhibcood
42a
Describe the general formula of a) Alkane
1 dhibcood
42b
Describe the general formula of b) Benzene
1 dhibcood
43
A sample gas occupies a volume of 1 liter at a pressure of 1 atm, At what pressure will its volume be 0.5 liter? (assuming temperature is constant)
4 dhibcood
44a
The table below which is collected at a set of temperature: Experiment 1: [A] = 0.20M, [B] = 0.20M, Rate = 0.4 M/s; Experiment 2: [A] = 0.20 M, [B] = 0.040M, Rate = 0.8 M/s; Experiment 3: [A] = 0.40 M, [B] = 0.20M, Rate = 1.6 M/s. a) Determine the rate law?
3 dhibcood
44b
The table below which is collected at a set of temperature: Experiment 1: [A] = 0.20M, [B] = 0.20M, Rate = 0.4 M/s; Experiment 2: [A] = 0.20 M, [B] = 0.040M, Rate = 0.8 M/s; Experiment 3: [A] = 0.40 M, [B] = 0.20M, Rate = 1.6 M/s. b) Calculate the value of rate constant?
3 dhibcood
45a
Identify the following elements as metals, non-metals and metalloids. a. Silicon
1 dhibcood
45b
Identify the following elements as metals, non-metals and metalloids. b. Mercury
1 dhibcood
45c
Identify the following elements as metals, non-metals and metalloids. c. Carbon
1 dhibcood
45d
Identify the following elements as metals, non-metals and metalloids. d. Gold
1 dhibcood
46
What are types of physical forms of radiation?
2 dhibcood
47a
Reactions can be classified into exothermic and endothermic reaction. In the figure below is reaction profile (the products are at a higher energy than the reactants). a) What is type of reaction indicate above reaction profile
2 dhibcood
47b
Reactions can be classified into exothermic and endothermic reaction. In the figure below is reaction profile (the products are at a higher energy than the reactants). b) Describe the sign of ΔH the reaction you mentioned in "a"
1 dhibcood
48
Sodium atom reacts with chlorine molecule gas to forma sodium chloride. Write balanced chemical equation of above reaction
4 dhibcood
49a
Amino acids combine to form proteins, when four amino acids are linked they form tetra peptides. The figure shows the tetrapeptide H2N-Cys-His-Glu-Met-COOH with the amino acids labelled Cytosine (C), Histidine (H), Glutaric acid (E) and Methionine (M) from left to right. a) By using the above figure which amino acid is N-terminal
2 dhibcood
49b
Amino acids combine to form proteins, when four amino acids are linked they form tetra peptides. The figure shows the tetrapeptide H2N-Cys-His-Glu-Met-COOH with the amino acids labelled Cytosine (C), Histidine (H), Glutaric acid (E) and Methionine (M) from left to right. b) By using the above figure which is C-terminal
2 dhibcood
50a
Calculate the pH of each of the following a. [OH-] = 1.5 × 10^-5
3 dhibcood
50b
Calculate the pH of each of the following b. [H3O+] = 2.3 × 10^-2
3 dhibcood
51
What is the equilibrium constant, Kc, if the equilibrium concentrations are as follows: PCl5 is 0.096 M, PCl3 is 0.024 M and Cl2 is 0.024 M. PCl5(g) ⇌ PCl3(g) + Cl2(g)
4 dhibcood
52i
Salt bridge is U shaped tube filled with a mixture of agar-agar which plays an important roles in Galvanic cell. Name the labeled parts (i) Q and S (ii) by using the figure below. i. Q
1 dhibcood
52ii
Salt bridge is U shaped tube filled with a mixture of agar-agar which plays an important roles in Galvanic cell. Name the labeled parts (i) Q and S (ii) by using the figure below. ii. S
1 dhibcood
53a
The following table shows the boiling points of alkanes, aldehydes, ketones and alcohols: Pentane CH3CH2CH2CH2CH3 36 °C; Butanal CH3CH2CH2CHO 76 °C; 2-butane CH3CH2COCH3 80 °C; 1-butanol CH3CH2CH2CHOH 118 °C. Use the table to answer these questions: a. Explain why aldehydes and ketones have lower boiling points than alcohols?
2 dhibcood
53b
The following table shows the boiling points of alkanes, aldehydes, ketones and alcohols: Pentane CH3CH2CH2CH2CH3 36 °C; Butanal CH3CH2CH2CHO 76 °C; 2-butane CH3CH2COCH3 80 °C; 1-butanol CH3CH2CH2CHOH 118 °C. Use the table to answer these questions: b. Predict which one has a higher boiling point pentane or butanal? Justify your answer.
2 dhibcood
54a
Indicate whether the reaction rate increase or decrease: a. Adding of catalyst in reaction
1 dhibcood
54b
Indicate whether the reaction rate increase or decrease: b. Decreasing temperature
1 dhibcood
54c
Indicate whether the reaction rate increase or decrease: c. Decreasing the concentration of reactant
1 dhibcood
54d
Indicate whether the reaction rate increase or decrease: d. Reducing size of solid reactant
1 dhibcood
55
The half life of the polonium-210 is 138.4 days. How many milligrams of polonium-210 remains after 692 days if the starting with 8mg of isotope?
5 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.

Imtixaanada kale ee hore ee Form 4 Chemistry

Dhammaan cutubyada Form 4 Chemistry

Gal imtixaankan

Tilmaamaha ardayga

SECTION A: Circle the Correct Answer (40 Marks)

SECTION B: Structured Questions (60 Marks)

Imtixaanada kale ee hore ee Form 4 Chemistry

Waxaan aqbalnaa