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Qormaata galuumsa kutaa 12ffaa Keemistirii, bara 2012 A.L.I (2020)

Gaaffilee dhugaa qormaata galuumsa yunivarsiitii kutaa 12 kan Keemistirii, akkuma barattoonni bara 2012 A.L.I itti fudhatanitti. Tokkoon tokkoon gaaffii deebii sirrii fi ibsa qaba.

Bilisaan shaakaluu jalqabaaWaraqaa gaaffii

  • Damee saayinsii uumamaa

    Eenyutu fudhata

  • 2012 A.L.I (2020)

    Bara qormaataa

  • Gaaffilee 77 deebii waliin

    Kuusaa kana keessa

Gaaffilee qormaata kanaa yaalaa

Deebii banuun dura tokkoon tokkoon gaaffii ofii keessaniin deebisaa. Ibsi gara kutaa kitaaba barnootaa sirriitti waan qajeelchuuf, yeroo gaaffii dogoggortan fuula kam irra deebi'uu akka qabdan ni beektu.

Gaaffii 1

According to World Health Organization (WHO), the standard for the concentration of alcohol used to prevent COVID-19 virus is 70%. How much water has to be added to prepare the standard alcohol for 1L of 96% alcohol?

  1. A.1371.4 ml
  2. B.371.4 L
  3. C.371.4 ml
  4. D.30 ml
Deebii fi ibsa ilaalaa

Deebii: C 371.4 ml

Maaliif

Using the dilution formula C1V1=C2V2C_1 V_1 = C_2 V_2, the final volume required is V2=(96%×1000 mL)/70%=1371.4 mLV_2 = (96\% \times 1000\text{ mL}) / 70\% = 1371.4\text{ mL}. Thus, the volume of water that must be added to the 1 L1\text{ L} of alcohol is 1371.4 mL−1000 mL=371.4 mL1371.4\text{ mL} - 1000\text{ mL} = 371.4\text{ mL}.

Gaaffii 2

In which of the following solvents would you expect the solubility of NaCl to be greatest?

  1. A.Carbon tetrachloride (CCl4)
  2. B.Water (H2O)
  3. C.Methanol (CH3OH)
  4. D.Methanol (CH3OH)
Deebii fi ibsa ilaalaa

Deebii: B Water (H2O)

Maaliif

NaCl is an ionic compound and dissolves best in highly polar solvents that can effectively solvate its ions through strong ion-dipole interactions. Water has a much higher dielectric constant and polarity compared to carbon tetrachloride and methanol.

Gaaffii 3

Which of the following substances might stabilize a colloidal suspension of oil in water?

  1. A.Sodium stearate NaCO2(CH2)16CH3
  2. B.Sodium bicarbonate (NaHCO3)
  3. C.H2O
  4. D.CaCl2
Deebii fi ibsa ilaalaa

Deebii: A Sodium stearate NaCO2(CH2)16CH3

Maaliif

Sodium stearate is an emulsifying agent (soap) containing a hydrophobic non-polar hydrocarbon tail that interacts with the oil and a hydrophilic polar head group that interacts with water, thereby stabilizing the colloidal suspension of oil in water.

Gaaffii 4

How many moles of unknown weak acid (HA) in a 100 L solution are required to produce a solution with pH = 2? Ka of the unknown weak acid (HA) = 5×10^-3.

  1. A.3×10^-3
  2. B.0.3×10^-3
  3. C.3
  4. D.0.3
Deebii fi ibsa ilaalaa

Deebii: C 3

Maaliif

A pH of 2 corresponds to [H+]=10−2 M=0.01 M[\text{H}^+] = 10^{-2}\text{ M} = 0.01\text{ M}. Since Ka=[H+]2[HA]0−[H+]K_a = \frac{[\text{H}^+]^2}{[\text{HA}]_0 - [\text{H}^+]}, we have 5×10−3=(0.01)2[HA]0−0.015 \times 10^{-3} = \frac{(0.01)^2}{[\text{HA}]_0 - 0.01}, giving [HA]0=0.03 M[\text{HA}]_0 = 0.03\text{ M}. For a 100 L100\text{ L} solution, the required amount is 0.03 M×100 L=3 moles0.03\text{ M} \times 100\text{ L} = 3\text{ moles}.

Gaaffii 5

If different processes are used to bring about the same change the enthalpy changes during these processes are the same, this is the statement of

  1. A.Hess's law
  2. B.Standard Enthalpy
  3. C.1st law thermodynamics
  4. D.2nd law thermodynamics
Deebii fi ibsa ilaalaa

Deebii: A Hess's law

Maaliif

Hess's law states that the total enthalpy change for a chemical reaction is the same regardless of whether the reaction takes place in one step or in several steps.

Gaaffii 6

Which of the following 0.1 M solutions has the lowest pH?

  1. A.NaNO2
  2. B.KClO4
  3. C.NH4Cl
  4. D.NH3
Deebii fi ibsa ilaalaa

Deebii: C NH4Cl

Maaliif

NH4Cl\text{NH}_4\text{Cl} is a salt of a strong acid (HCl\text{HCl}) and a weak base (NH3\text{NH}_3). Its cation, NH4+\text{NH}_4^+, undergoes hydrolysis in water to produce hydronium ions, making the solution acidic (%pH<7\%\text{pH} < 7), which is lower than the neutral KClO4\text{KClO}_4 or basic NaNO2\text{NaNO}_2 and NH3\text{NH}_3 solutions.

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Gaaffilee 77 kuusaa kana keessa jiran hunda akka waraqaa qormaataa maxxanfameetti, furtuu deebii ibsa 77 waliin immoo akka faayilii lammaffaatti. Maxxansaa yookiin daataa malee dubbisaa.

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Herregni Temari bilisaa qormaata Keemistirii guutuu fi kan waggoota biroo hunda qormaatilee fakkeenyaa sa'aatiin daangeffaman godhee qabxii battalumaa waliin isiniif kenna. Bilbila kamiyyuu irratti, walitti hidhamiinsa laafaa irrattillee ni hojjeta.

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Qormaata kana taa'uu dura Keemistirii qayyabadhu

Yaadannoon gabaabaan Keemistirii kutaa 12 kaardii 22 qaba. Tokkoon tokkoon boqonnaa boqonnaadhaan kitaaba biyyaalessaa irraa qophaa'ee seericha, mallattoowwan isaa maal bakka akka bu'an fi dogoggora qabxii nama dhabsiisu ni ibsa.

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Kunneen gaaffilee dhugaa qormaata galuumsa Keemistirii bara 2012 A.L.I ti?

Eeyyee. Qormaata galuumsa yunivarsiitii biyyaalessaa kan Keemistirii barattoonni bara 2012 A.L.I (2020) fudhatan irraa fudhataman. Kuusaan keenya gaaffilee isaa 77 qaba; tokkoon tokkoon isaanii deebii fi ibsa gara kitaaba barnootaatti qajeelchu qabu.

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