arab republic of egypt 〕2〔 ministry of education general...

〔 بقية األسئلة فى الصفحة الثالثة 〕

〔 بقية األسئلة فى الصفحة الثانية 〕

〔2〕

طبعى وي

ل اليدوص

ألق ل

طابى وم

ربص الع

ى النعل

جع ُرو

ى

عل

سئوليةم

جنة الفنية ،

الل

〔 األسئلة فى أربع صفحات 〕

〔باللغة اإلنجليزية 〕 كـيميـاءلـا

ARAB REPUBLIC OF EGYPT

Ministry of Education

General Secondary Education Certificate Examination, 2015

〕 New System – second Session 〔

Chemistry Time: 3 hours

〕E.N / 15〔〕E.N / 15〔 ح /ثث.ع / 〔/ ج 50〕تـابـع ح /ثث.ع / 〔/ ج 50〕

خريـ

التا

التوقيــــــــع

ســـــمال

ا

خري

التا


ســـــمال

ا

يسلم الطالب ورقة امتحانية باللغة العربية مع الورقة المترجمة . -1 : تنبيه مهم

لن تقدر ويتم تقدير اإلجابة األولى فقط . تعددكررة عن أسئلة االختيار من متاإلجابات الم -2

105

{ Write all the chemical equations balanced, mention the conditions of the reaction }

Answer four questions only from the following

Question (1) ( 15 marks )

First: Choose the correct answer from each of the following statements:

1- The number of moles in 292.5 gm. of sodium chloride is …….. mole.

( Na = 23 - Cl = 35.5 )

a ) 15 b ) 5

c ) 0.2 d ) 0.5

2- If 1 mole of potassium sulphate is dissolved in water and it was completely

Ionized, the number of potassium ions in the solution equals …….. ion.

a ) 1 b ) 2

c ) 1 × 6.02 × 1023 d ) 2 × 6.02 × 1023

3- Among the relatively slow reactions is …….. .

a ) Solution of silver nitrate with a solution of sodium chloride.

b ) Oil with caustic soda to form soap and glycerin.

c ) A magnesium ribbon with diluted hydrochloric acid.

d ) Sodium hydroxide solution with a solution of hydrochloric acid.

4- A solution has pH less than 7 is …….. .

a ) Pure water. b ) Sea water.

c ) Vinegar. d ) Ammonia solution.

5- The reduction process that takes place in the dry cell is for…….. substance.

a ) Zinc. b ) Ammonium chloride.

c ) Zinc chloride. d ) Manganese dioxide.

6- The standard electrode potential for hydrogen equals ……. .

a ) Zero b ) 1

c ) −1 d ) 0.1

Second: 1- Vinyl acetylene is considered as one of the unsaturated aliphatic

hydrocarbons which is characterized by the presence of one double bond and another one of triple bond, Its structure is represented by the following:

a ) How many moles of hydrogen, are required to convert it to a saturated compound?

b ) What is the name of the produced compound on adding hydrogen, according to IUPAC system?

c ) What is the type of hybridization of carbon atoms (1,2) represented in the figure?

2- Mention one use for each of the following: a ) Sodium benzoate. b ) Teflon.

3- Illustrate with complete labeled drawing how to obtain aluminum from bauxite, then write the oxidation-reduction equations and the overall reaction.

Question (2) ( 15 marks ) First:

1- What is meant by each of the following?

a ) Ionic equilibrium. b ) Chemical analysis. c ) Ampere. 2- Write the name of the following compounds according to IUPAC system:

a ) b )

Second: 1- Arrange the following steps to prepare carbolic acid from sodium

benzoate and write the chemical equations: a ) Halogenation. b ) Hydrolysis. c ) Dry distillation.

2- How does each of the following changes affect the concentration of hydrogen gas in the following system at its equilibrium state?

∆H = 41.1 K.J (g)+ CO(g) O2H 2(g)+ CO 2(g)H

a ) Addition of more carbon dioxide gas. b ) Addition of more water vapour. c ) Increasing temperature. d ) Decreasing the vessel volume.

3- Draw only the labeled apparatus used to prepare ethyne gas in laboratory.

H H H

| | |

H – C – C – C ؤ C – C – H

| | |

Cl H H

O2N

NO2

NO2

CH3

طبعى وي

ل اليدوص

ألق ل

طابى وم

ربص الع

ى النعل

جع ُرو

ى

عل

سئولية م

جنة الفنية ،

الل

〔 بقية األسئلة فى الصفحة الرابعة 〕

〔 انتـهـت األســئـلـة 〕

〔3〕

〔4〕

〔/ ج 50〕 تـابـع ح /ثث.ع / 〔/ ج 50〕تـابـع 〕E.N / 15〔〕E.N / 15〔 ح /ثث.ع /

خريـ

التا


ســـــمال

ا

خري

التا


ســـــمال

ا


First: Write the scientific term which refers to each of the following

statements:

1- Small volume cell, commonly used in ear phones and clocks.

2- Type of electric cells from which we obtain electric current as a result of

spontaneous oxidation-reduction reaction.

3- The volumes of gases involved in a reaction and the gases produced are

exist in fixed ratios.

4- A system which is apparently a stationary on the visible level, but in reality

it is a dynamic system on the invisible level.

5- A substance used in a small quantity to change the rate of the chemical

reaction without itself being changed or change the equilibrium state.

Second:

1- What is the quantity of electricity (coulombs) necessary to separate 5.6 gram

of iron from a solution of iron(III) chloride where the cathode reaction is:

Fe3+ + 3e− → Fe0 ( Fe = 55.86 )

2- Illustrate by a chemical equation how to obtain an artificial detergent from

aromatic sulphonic acid compounds.

3- a) what is meant by functional groups in organic compounds?

b) Write the functional group for each of the following organic

compounds:

(Alcohols – Aldehydes – Ketones – Carboxylic acids – Amines)

Write the chemical formula for an example of each of the previous

compounds.


First: Write the scientific explanation for each of the following:

1- The density of CO2 gas is more than that of hydrogen gas.

2- The solution of Iron (III) chloride has an acidic effect on litmus dye.

3- It is possible to apply the law of mass action on weak electrolytes.

4- Cyclo propane is more active than normal propane.

Second:

1- A 0.1 gram of a mixture of solid substance containing sodium hydroxide and

sodium chloride was titrated with 0.1 molar hydrochloric acid. The complete

reaction (end point) takes place by the consumption of 10 ml of the acid,

calculate the percentage of sodium hydroxide in the mixture.

2- Write the symbolic equations and the condition of reaction which

illustrate the following reactions:

a ) Alkylation of benzene.

b ) Saponification for ethyl benzoate.

c ) Nitration of benzene.


First:

1- What is the role of the following scientist in chemistry?

a ) Avogadro.

b ) Ostwald.

c ) Wöhler.

2- Compare between each of the following:

a ) Complete and reversible reactions.

b ) Organic and inorganic compounds.

3- Calculate the mass of oxygen in 0.1 gram of adrenaline hormone, Its

molecular formula is (C9H13NO3) given that (C=12 , O=16 , N=14 , H=1).

Second:

1- By using the following table determine:

Acetic acid Formic acid Oxalic acid

Ethyl formate Methyl acetate Ethyl acetate

a ) Two isomeric compounds.

b ) Two compounds that give acetamide on ammonolysis.

c ) Two compounds that give effervescence with NaHCO3

d ) Compound that is named according to IUPAC ethyl methanoate.

2- Secondary cells are considered as storage energy batteries.

Explain this statement, and write the equation for charging the car battery.

1

Question (1) (15marks)

First: 6 marks (1×6 = 6)

1- b) 5

2- d) 2×6.02×10 23.

3- b) Oil with caustic soda to form soap and glycerin.

4- c) Vinegar.

5- d) Manganese dioxide.

6- a) Zero.

Second: 9 marks

1- 3 marks (1×3=3)

a) The number of hydrogen moles required = 3 hydrogen moles (3 molecules)

Due to breaking of pi bond of double bond and two pi from triple bond and for each

broken bond two atoms of hydrogen are added (molecule) = 1 mole. (1 mark)

b) The name of the compound produced after conversion according to IUPAC

Is (butane)it is a saturated hydrocarbon compound that contains 4 carbon atoms.

(1 mark)

c) The type of hybridization for carbon(C1) is (sp), but the hybridization for carbon (C2)

is (sp2) . (1 mark)

2- Two marks (1×2=2)

a) Sodium benzoate is used as a preservation substance for food, because it prevents the

growth of fungi on food.(p:178)

b) Teflon: it is used in lining cooking utensils and surgical threads.(P:122).

3- 4 marks (one mark for drawing and one mark for each equation):

At cathode

2Al3+ + 6e− reduction

2Al

At anode

3O2- oxidation

3

2 O2 + 6e−

The overall reaction

2Al 3+ + 3O2- 2Al + 3

2 O2

( 06) ىـالدرجة العظم

( 06الدرجة الصغرى )

( 5) اتــدد الصفحـع

[56 ]

ثانىالدور ال

) نظام حديث (

جمهورية مصر العربية مـة والتعليـوزارة التربي الدراسة الثانوية العامةامتحان شهادة إتمام م 1625لعام [ باالنجليزية الكيمياءنموذج إجابة ]

2

1625 [ باالنجليزية الكيمياءنموذج إجابة ] / ح ثث.ع / [ 56] تابع


First: 5 mark

1- 3 marks (1×3=3)

a) Ionic equilibrium: it is a state of equilibrium arising between molecules of a weak

electrolyte and ions resulting from it. (p:45)(1 mark)

b) Chemical analysis: it includes qualitative and quantitative analysis:

Examination aims to identify the constituents of the substance, determination of

concentration or quantity of the constituents of the sample. (P:15)(1 mark)

c) Ampere: it is the quantity of electricity which if it is passed for one second in a

solution of silver ions,1.118 milligram of silver is precipitated. (1 mark)(P:82)

2- Two marks each one has one mark:

a) 5 chloro -2pentyne.(P:123) b) 2,4,6 tri nitro toluene.(P:136)

Second:10 marks.

1- 4.5Marks (3 marks for equations and one and half marks for arrangement).

1) Dry distillation (½ mark)

(1 mark)

2) Halogenation (½ mark)

(1 mark)

3) Hydrolysis (½ mark)

(1 mark)

2- 4 marks (1×4=4)

The effect of changes on the concentration of hydrogen in the equilibrium system

(school’s book P:58)

a) Addition of more CO2 : disturbance takes place and the reaction goes forward to

consume the excess amount of CO2 and the concentration of hydrogen reduces.

b) Addition of more water vapour : disturbance takes place and the reaction goes

reversible to consume the excess amount of H2O and so the concentration of

hydrogen increase.

c) Increasing the temperature : the reaction absorbs energy the reaction goes to forward

to consume the increasing in heat and so the concentration of hydrogen decrease.

d) Decreasing the vessel volume (increasing pressure) The number of volumes in

reactants = number of volumes resulted from reaction, so no effect for increasing

pressure and the concentration of hydrogen does not change.

3- (one and half mark) P:260

C6H5COONa + NaOH C6H6 + Na2CO3 CaO

إ

C6H6 + Cl2 C6H5Cl + HCl

FeCl3

Indirect sunlight

C6H5Cl + NaOH C6H5OH + NaCl 300○ C

300 P

3



First: 5 marks 1 × 5

1- Mercury cell (1 mark) (p:75)

2- galvanic cells (1 mark) (P:75)

3- Gay-Lussac law (1 mark) (P:9)

4- system in equilibrium state (1 mark) (P:31)

5- Catalyst (1 mark) (P:41)

Second:(10 marks)

1- 2 marks

Equivalent mass of iron = atomic mass/valency = 55.86/3 = 18.62 gm (½ mark)

The deposition of 18.62 gm of iron needs 96500 coulomb

And deposition of 5.6 gm of iron needs X coulomb (½ mark)

Quantity of electricity = mass of deposited substance × 96500 / equivalent mass of

deposited substance (½ mark)

= 5.6 × 96500 / 18.62 = 29022.5 coulomb. (½ mark)

2- 2 marks (one mark for equation and one mark for structure)

the molecule of detergent consists of tail which is a long carbon chain, It is hydrophobic.

The other part is hydrophilic head and it is an ionized group and is directed towards

water. (P:139)

3- (6 marks) a) one mark, b) 5 marks)

a) The functional group in organic compounds: it is a group of atoms combine together

by a certain way to form a part of the molecule. However, its activity overcomes all

the other properties of the whole molecule. (p:147) (1 mark)

b) 5 marks 0.5 × 10

Compound Functional group Example

Alcohols the hydroxyl (– OH) CH3OH – C2H5OH

Aldehydes Aldehyde (– CHO) HCHO – CH3CHO – C6H5CHO

Ketones Ketone ( C = O) ( CH3)2C=O

Carboxylic acids Carboxyl (– COOH) HCOOH – CH3COOH – C6H5COOH

Amines Amine (– NH2) CH3NH2 – C2H5NH2

One example is enough to gain one mark

+ NaOH + H2O SO3H R SO3−Na+ R

4



First (8 marks) 2× 4

1- Because the molecular mass of CO2 (44 gm) is more than that of H2 (2gm) and the two

masses equipy equal volumes at( S.T.P) and the denisity = mass/volume, so the density

of carbon dioxide is more than the density of oxygen.

2- When dissolving iron (III ) chloride in water, Fe(OH)3 is formed which is a weak alkali

and no hydrochloric acid is formed because it is a strong acid which leads to

disturbance of equilibrium and the water is ionized to produce H+ to compensate the

hydroxyl according to Le-Chatelier principle and the concentration of hydrogen ions

increases and producing pH<7

FeCl3 → 3Cl− + Fe3+

3H2O 3 H+ + 3OH−

By addition

H2O + FeCl3 → 3H+ + 3Cl− + Fe(OH)3

3- Because the weak electrolyte are not completely ionized. so the ionic equilibrium takes

place between the molecules and the ions which leads to the possibility of applying the

law of mass action.

4- Because the angles between the bonds in cyclo propane equals 60○ which leads to weak

overlap between the atomic orbitals, therefore the bonds between carbon atoms are

weak – so it is very active. While in n-butane there is a strong overlap between orbitals

forming the strong sigma bonds which is difficult to be broken and so it is chemically

inactive.

Second:(7 marks)(P:84)

1- two marks and half

Number of moles of hydrochloric acid used =10×0.1/1000 = 0.001 mole (½ mark)

It is known that 1 mole of sodium hydroxide reacts with 1 mole of hydrochloric acid,

therefore the number of moles of sodium hydroxide = 0.001 mole.(½ mark)

1 mole of sodium hydroxide = 1 + 16 + 23 = 40 gm (½ mark)

The mass of sodium hydroxide in the mixture = 40×0.001= 0.04 gm. (½ mark)

% sodium hydroxide in the mixture = 0.04×100 / 0.1= 40% (½ mark)

2- four and half marks (1 mark for each equation and ½ mark for condition)

a) (p:271)

b) (p:321)

c) (p:271)

N.B. (any correct equation gives the same type of reaction takes the same degree).

+ CH3Cl + H2O AlCl3

anhydrous

CH3

+ HO − NO2 + H2O H2SO4 conc.

50○ C

NO2

C6H5COOC2H5 + NaOH C6H5COONa + C2H5OH heat

5



First:9 marks

1- 3 marks(1×3=3)

a) Avogadro: he conclude that each mole of any gas contains the same number of

molecules at (S.T.P) and introduced this relationship by a law of Avogadro.(p:9)

b) Ostwald: He described the relationship between the degree of ionization of weak

electrolyte alpha α and c concentration for solution ( C ) mole/liter (P:45)

c) WÖhler: destroyed the vital force theory when preparing urea from two inorganic

compounds (silver cyanate and ammonium chloride) (P:95)

Second:4 marks(2x2=4)

1- (P:31) one mark for any correct answer.

Irreversible reactions Reversible reactions

They produced in one direction because

one of the products escapes from the

system. Ex:

AgNO3+NaCl → NaNO3 +AgCl↓

They produced in the forward and backward

directions. Ex: CH3COOH+C2H5OH CH3COOC2H5+H2O

2- (P: 98)

Organic compounds inorganic compounds

most of them are insoluble in water but

soluble in organic solvents such as

benzene . Low melting and boiling point.

most of them are soluble in water-high

melting and boiling points.

3- Two marks (evaluation book P: 205)

Mass of one mole of adrenaline hormone =( 108 +13 + 14 + 48 ) = 183 gm (1 mark)

183 gm of adrenaline hormone contains ( 48 gm) of oxygen

0.1 gm of adrenaline hormone contain (X gm) of oxygen (½ mark)

(X) Mass of oxygen = 0.1× 48/183 = 0.026 gm (½ mark)

Secondly:6 marks

1- 4 marks (evaluation book P:205)

a) Ethyl formate - methyl acetate (two isomeric compounds (1 mark) (P:183)

b) Methyl acetate-Ethyl acetate Two compounds form acetamide (1 mark)(P:185)

c) Acetic acid-formic acid-oxalic acid react with effervesces with sodium bicarbonate

(1 mark) (two acids are enough) (P:175)

d) Ethyl formate. (1 mark)

2- Two marks

Because the battery is working during charging as an electrolytic cell, where a no

spontaneous chemical reaction takes place by passing electric current which comes

from external source in the form of chemical energy. (P:77)(1 mark)

The equation of charging the car battery :

(1 mark)

اإلجابة ى نموذجانته

+ CH3Cl + H2O AlCl3

ال مائى

CH3

++ 4H -24+ 2SO 2(S)+ PbO (S)Pb O 2+ 2H 42PbSO

charging

arab republic of egypt 〕2〔 ministry of education general...

Documents