أهم 100 سؤال فى مراجعة مادة الكيمياء لغات الجزء الخامس ثالث ثانوي
منتديات الأجيال التعليمية :: الملتقى الدراسي العام :: منتدى الامتحانات :: امتحانات الصف الثالث الثانوي
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أهم 100 سؤال فى مراجعة مادة الكيمياء لغات الجزء الخامس ثالث ثانوي
من طرف حنين الصمت الجمعة 10 مايو 2013, 9:11 pm
الدرس في شكل نص مقروء
أهم 100 سؤال فى مادة الكيمياء لغات - الجزء الخامس
Give reasons
1- The basic solution can't be used to differentiate between litmus and bromothymol blue
2- The density of CO2 is larger than the density of O2
3- Ashless filter paper is used in chemical analysis by precipetation method
4- Reaction between alcohol and carboxylic acis are reversible reaction
5- The law of mass action can be applied on weak electrolytes
6- Sodium chloride has neutral effect on litmus while sodium carbonate has basic effect
7- The acidic solution can't be used to differentiate between litmus and methyl orange
8- Divided nickel is used as a catalyst in hydrogenation of oil
9- Hydrogen chloride in benzene doesn't conduct electricity.
10- The reaction inside the electrolytic cell is non-spontaneous reaction.
11- Galvanic cell is a reversible cell.theoty.
12- Zinc replaces copper in its salt solutions while copper can’t
13- Hydrogen electrode is used to determine the electrode potential of other elements.
14- Recently we use fluoride salts of sodium, aluminum and calcium instead of cryolite in preparation of aluminum from bauxite
Answer: give reasons
1- Both has blue colour in basic solution
2- The molecular mass of CO2 is larger than that of O2 wher density =
3- It gives no ash after burning
4- The reaction proceed in both direction forward and backword
5- Both reactant and products are found in the medium
6- NaCl in H2O gives strong base and strong acid, Na2CO3 gives strong base and weal acid
7- Both has red colour in acidic solution
8- The rate of the reaction increases as the surface are increases
9- It doesn't ionized in benzene
10- It needes outer source of energy .
11- It can be recharged
12- It has oxidation potential higher than copper
13- Its standard electrode = zero
14- To decrease melting point and decrease density of thr mixture
Compare between
1- Volumetric analysis and gravimetric analysis
2- Reversible reaction and irreversible reaction
3- Strong electrolyte and weak electrolyte
4- Complete ionization and incomplete ionization
5- Electric cell and galvanic cell
6- Drey cell and mercury cell
7- Nickel cadmium battery and car battery
8- Dery cell and lead storge cell
Answer Comparison
Volumetric analysis gravimetric analysis
Analysis based on measuring the volume of the analyte Analysis based on measuring the mass of the analyte
Reversible reaction Irreversible reaction
Reaction proceed in forward and bakword Reaction proceed in one direction
The products react to form reactants Products can't react
Both reactants and products are found One of the products escape from the medium
N2 + 3H2 2NH3
Mg + H2SO4 MgSO4 + H2
Strong electrolyte weak electrolyte
Completley ionized Not completely ionized
H2SO4 – HCl – HNO3 – KOH – NaOH
Complete ionization incomplete ionization
All molecules are converted into ions Some molecules are converted into ions
In strong electrolytes In weak electrolytes
HCl H+ + Cl-
CH3COOH CH3COO- + H+
Galvanic cell Electric cell
1-Convert chemical energy into electric energy 1-Convert electric energy into chemical energy
2- spontaneous redox reaction 2- non-spontaneous redox reaction
3- anode –ve and cathode=+ve 3- anode +ve and cathode=-ve
4- some can be recharged 4- can’t be recharged
5- two poles must be different 5- two polessimilar or different
Dry cell Mercury cell
1- anode is zinc 1- anode is zinc
2- cathode is carbon 2- cathode is MgO
3- electrolyte NH4Cl 3- electrolyte KOH
4- e.m.f = 1.5 volts 4- e.m.f = 1.35 volts
ZnO+2MnO2+2NH4+ Zn2+ +2MnO(OH)+2NH3 Zn + HgO ZnO + Hg
Zn/Zn2+ // 2Mn+4 / 2Mn3+ Zn/Zn2+ // Hg2+ / Hg
Ni-Cd battery Car battery
1- anode is cadmium 1- anode is Pb
2- cathode is nickel 2- cathode is PbO2
3- electrolyte KOH 3- electrolyte H2SO4
4- e.m.f = 1.3 volts 4- e.m.f = 2 X 6 = 12 volts
Cd +2NiO(OH)+2H2O
Cd(OH)2 + 2Ni(OH)2 Pb+PbO2+4H+ +2SO2+
2PbSO4+2H2O
Cd/Cd2+ // 2Ni3+ / 2Ni2+ Pb0/Pb2+ // Pb4+ / Pb2+
Dry cell Lead storge cell
1- anode is zinc 1- anode is Pb
2- cathode is carbon 2- cathode is PbO2
3- electrolyte NH4Cl 3- electrolyte H2SO4
4- e.m.f = 1.5 volts 4- e.m.f = 2 X 6 = 12 volts
5- primary (can't be recharged) 5- secondary (can be recharged)
ZnO+2MnO2+2NH4+ Zn2+ +2MnO(OH)+2NH3 Pb+PbO2+4H+ +2SO2+
2PbSO4+2H2O
Zn/Zn2+ // 2Mn+4 / 2Mn3+ Pb0/Pb2+ // Pb4+ / Pb2+
What are
1- The factors affecting the rate of the chemical reactions
2- The factors affecting the a chemical reactions at equilibrium
3- The importance of : a- Electrolysis b- Electroplating
c- Bauxite d- Purification
Answer what are
1- The factors affecting the rate of the chemical reactions:
Nature of the reactants (type of bond –surface area) – concentration – temperature
pressure – catalyst - light
2- The factors affecting the a chemical reactions at equilibrium
Concentration – temperature – pressure
3- Term Importance
Electrolysis Preparing element or compound using electric current
Electroplating Get shiny- high value or resist corrosion
Bauxite Solvent of bauxite in preparation of aluminum
Purification Get rid of impurities and get pure element
Scientific term
1. Molecular mass in gram
2. The volume of gases involved in a reaction and gases produced are exist in fixed ratio
3. Equal volumes of gasses under the same p.and temp. contains equal no. of molecules
4. Determination of the concentration or quantity of the constituents of the sample
5. A branch of chemistry deals with the methods and instruments used for both qualitative
and quantitative analysis
6. It is based on measurement of the volume of the substance to be analyzed
7. Measuring the amount of a reagent of known concentration (standard solution) that is completely by the analyte
8. Substance which change its colour in the reaction medium , indicators are used to detect the end point of the reaction
9. It is apparently a stationary system but in reality dynamic.
10. The maximum water vapour pressure at a certain temperature
11. It proceeds in one direction because products cannot react together to form the reactants
12. It proceeds in forward and backward direction by the same rate at the same conditions
13. When the rate of the forward reaction equals the rate of the backward reaction at the same condition
14. The change of concentration of reactants or products per unit time
15. At constant temperature the rate of the reaction is directly
proportional t the product of the multiplication of the reactant
concentrations, each one is raised to the power of the number of
molecules or ions in balanced equation
16. To have a chemical reaction molecules must collide with each other
17. The minimum amount of energy must be gained by molecules to react at collision
18. The molecule which has kinetic energy equals to or more than activation energy
19. The changes in any of the conditions of a chemical
equilibrium such as conc., p. or temp. cause shift the equilibrium in
the direction which will oppose this change
20. Substance causes a change in the rate of chemical reaction without itself being changed
21. High molecular weight protein produce in living cell an acts as a catalyst
22. All molecules are converted into ions
23. Some molecules are converted into ions
24. The equilibrium arising between molecules of a weak electrolyte and its ions
25. At a constant temperature , the degree of ionization increases by dilution
26. Multiplying concentration of hydrogen ion times that of hydroxide ion ( it = 10-14 )
27. The negative logarithm of hydrogen ion concentration .( it
is a way to express the degree of acidity or alkalinity of a solution)
28. It is the product of multiplication of the concentration of
its ions, raised to the power of the number of ions which exist in
equilibrium with its saturated solution
29. The multiplying of electric current intenisity in ampere and time in second.
Answer Scientific term
1. Mole
2. Gay–Lussac’law
3. Avogadro’s law
4. Quantitative Analysis
5. Chemical analysis.
6. Volumetric analysis
7. Titration
8. Indicator
9. Equilibrium system
10. Saturated Water vapour pressure
11. Irreversible reaction
12. Reversible reaction
13. Chemical Equilibrium
14. Rate of chemical reaction
15. Law of mass action
16. Collision theory
17. Activation energy
18. Activated molecule
19. Le Chatelier's principle
20. Catalyst
21. Enzyme
22. Complete ionization
23. Incomplete ionization
24. Ionic equilibrium
25. Ostwald's law
26. Ionic product of water
27. pH value
28. Solubility product
29. Coulomn
حنين الصمت- مدير عام المنتدى
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عدد المساهمات : 5102
نقاط : 29201
تاريخ التسجيل : 08/09/2011
منتديات الأجيال التعليمية :: الملتقى الدراسي العام :: منتدى الامتحانات :: امتحانات الصف الثالث الثانوي
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