Item ID: Standard: Item Type: MC. Subject: Level: G12A DOK: 1 Correct Response: b فشيق االعذاد : أ. وس أ. يذ ذ عبذ انفخبح أ.
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1 Item ID: Standard: Item Type: MC Subject: Level: G12A DOK: 1 Correct Response: b Which of the following listed below is the only Brønsted-Lowry base? أي ي انخيبساث انخبنيت أد ب ح ثم قبعذة بشو سخذ- نىسي فقط a. HCl - b. HCO 3 c. H 3 O + d. H 3 PO 4 Item ID: Standard: Item Type: MC Subject: Level: G12A DOK: 2 Correct Response: b What is the value of pka for solution of acetic acid ( 0.1 M ) and ph = 5? a- 8 b- 9 c- 7 d- 5 يب قي ت pka ن ذهىل د ط أسيخيك )0.1 يىنش( و ph=5 1
2 Item ID: Standard: Item Type: MC Subject: Level: G12A DOK: 2 Correct Response: b What is the ph of a M solution of NaOH? يب قي ت ph ن ذهىل يىنش ي NaOH a- 11 b- 10 c- 4 d- 5 Item ID: Standard: Item Type: MC Subject: Level: G12A DOK: 2 Correct Response: d From the following equation ي ان عبدنت انخبنيت HF + HCO 3 - F - + H 2 CO 3 Identify the bases in the reaction. دذد انقىاعذ في انخفبعم a. HF and HCO 3 - b. F - and H 2 CO 3 c. HF and H 2 CO 3 d. F - and HCO 3-2
3 Item ID: Standard: Item Type: MC Subject: Level: G12A DOK: 2 Correct Response: c The buffer solution keep ph constant in a solution because? يبقي ان ذهىل ان ظى قي ت ph نه ذهىل ثببخت بسبب a- React with all H + in the solution and keep OH - without reaction انتفبػم يغ كم + H ف ان حهىل و بم - OH بذو تفبػم. b- React with all of OH - and keep H + without reaction - انتفبػم يغ كم OH ف ان حهىل و بم + H بذو تفبػم. c- It can react with acid or base added to the solution إ ه ستط غ انتفبػم يغ انح ض أو انمبػذة انت تضبف إن ان حهىل. d- It can give H + and OH to the solution only - إ ه ستط غ فمظ أ ؼط + H و OH نه حهىل. Item ID: Standard: Item Type: MC Subject: Level: G12A DOK: 2 أ. بسبو سعيذ فشيق االعذاد : أ. وس أ. يذ ذ عبذ انفخبح Correct Response: c Which of the following salts is least soluble in water? أي ي األيالح انخبنيت األقم روبب ب في ان بء a. Ag 2 CO 3 Ksp 8.4 x b. Ag 2 CrO 4 Ksp 1.1 x c. AgI Ksp 1.5 x d. AgBr Ksp 5.4 x
4 Item ID: Standard: 21-1 Item Type: MC Subject: Level: G12A DOK: 2 Correct Response: d Which of the following equations represent the heat of formation for CO 2? أي ي ان عبدالث انخبنيت ح ثم دشاسة انخكىي ل CO 2 a- CO + ½ O 2 CO 2 H = -110Kj b- 2C + 2O 2 2 CO 2 H = -787 Kj c- CH 4 + O 2 CO 2 + H 2 O + heat H= -850 Kj d- C + O 2 CO 2 H = Kj Item ID: Standard: 21.2 Item Type: MC Subject: Level: G12A DOK: 3 Correct Response: b 2 O 3(g) 3 O 2(g) ΔH = kj O 2(g) 2 O (g) ΔH = +495 kj NO (g) + O 3(g) NO 2(g) + O 2(g) ΔH = -199 kj Using above equations.the enthalpy change for the following reaction is : ببسخخذاو ان عبدالث ان ذو ت أعال. انخغيش في ان ذخىي نهخفبعم انخبني هى: NO (g) + O (g) NO 2(g) a- ( Kj ) b- ( Kj ) c- ( Kj ) d- ( Kg ) 4
5 Item ID: Standard: 21-5 Item Type: MC Subject: Level: G12A DOK: 2 Correct Response: b The phase change that is incorrectly matched with its entropy change is انخغيش في انذبنت انفيزيبئيت انخي ح ثم انخغيش في األ خشوبي بشكم غيش صذيخ هى: a-liquid gas : change in entropy > zero - a سائل غاز التغ ر ف االنتروب < صفر b-liquid solid : change in entropy > zero - b سائل صلب التغ ر ف االنتروب < صفر c-gas liquid : change in entropy < zero - c غاز سائل التغ ر ف االنتروب > صفر d-solid gas : change in entropy > zero - d صلب غاز التغ ر ف االنتروب < صفر 5
6 Item ID: Standard: 21-5 Item Type: MC Subject: Level: G12A DOK: 2 Correct Response: d Which of the following has a positive entropy change? أي ي انخغيشاث انخبنية ي ثم حغيش يىجب نإل خشوبي a. formation of a liquid from a gas تكى سبئم ي غبص. a b. formation of a solid from a gas تكى صهب ي غبص. b c. formation of a solid from a liquid. صهب ي سبئم.تكى c d. Formation of gas from liquid تكى غبص ي سبال. d Subject: Level: G12A DOK: 3 Correct Response: d Under which of the following cases will a reaction can be spontaneous at all temperature? حذج أي ي انذبالث انخبنيت ي ك نخفبعم أ يذذد بصىسة حهقبئيت ع ذ كم دسجبث انذشاسة a H o + + S o b c d
7 Item ID: Standard: 21-7 Item Type: MC Subject: Level: G12A DOK: Correct Response: d Calculate ΔG at 25 C for the following reaction. أدسب ΔG ع ذ 25 س نهخفبعم اآلحي: CO 2 (g) + 2LiOH(s) LiCO 3 (s) + H 2 O(l) ΔH = kj, ΔS = -139 J/K a kj.mol -1 b- 135 kj.mol -1 c- 180 kj.mol -1 d kj.mol -1 7
8 Item ID: Standard: Item Type: CR Subject: Acid and base Level: G12 -A DOK: 2 Show by equations how H 2 PO 4-1 could act as a Bronsted acid and base in water. And identify each species as acid base in term of Bronsted-Lowry theory. -1 وظخ ببن عبدالث كيف يع م H 2 PO 4 كذ ط و قبعذة بشو سخذ في ان بء. ودذد كم ىع كذ ط أو قبعذة في ظىء ظشيت بشو سخذ نىسي H 2 PO H 2 O H 3 PO 4 + OH - Base Acid Conjugate acid conjugate base لبػذة يشافمت ح ض يشافك ح ض لبػذة H 2 PO H 2 O HPO H 3 O + Acid base Conjugate base Conjugate acid ح ض يشافك لبػذة يشافمت لبػذة ح ض 8
9 Item ID: Standard: Item Type: MC Subject: Level: G12A DOK: 3 Correct Response: c Use the following data to answer the following question. أسخخذو البيب بث انخبنيت نإلجببت ع انسؤال انخبني: PCl 3 ( g) Cl 2 ( g) PCl 5 ( g) Δ H o f (kj/mol) S o f (J/mol) Δ G o f (kj/mol) PCl 3 (g) + Cl 2 (g) PCl 5 (g) Calculate the Δ H and Δ S for this reaction at 298 K. أدسب Δ H وS Δ نهزا انخفبعم ع ذ K 298 a kj, J/K b kj, J/K c kj, J/K d KH, j/k 9
10 Item ID: Standard: Item Type: MC Subject: Indicator Level: G12A DOK: 2 Correct Response: d Which indicator is the best one for the titration shown in the graph? أي دنيم هىا ألفطل نخفبعم ان عبيشة ان ىظخ في انشكم Indicator rangein ph PKin Phenolphthalein انف ىنفثبن Methyl orange ان ث م انبشتمبن Methyl red ان ث م األح ش انف ىنفثبن Phenolphthalein. a) ان ث م انبشتمبن orange. b) Methyl انف ىنفثبن وان ث م انبشتمبن c) Phenolphthalein and methyl red ان ث م األح ش d) Methyl red 10
11 Item ID: Standard: Item Type: CR Subject: Acid and base Level: G12 -A DOK: 2 Use the following graph that represents titration between acid and base to answer the following questions: أستخذو انشكم انب ب انتبن انز ثم يؼب شة ح ض ولبػذة نإلجببت ػ األسئهت انتبن ت: base? 1- What is the type of acid and -1 يب ىع انح ض وانمبػذة 2- What is the equivalence point -2 يب ل ت مطت انتكبفؤ - Which indicator is the best one?explain 3-3 يب هى انذن م األفضم فسش رنك. Indicator انذن م pk in Range Methyl orange ان ث م انبشتمبن بشويىكش ضول أخضشgreen Bromocresol Methyl red ان ث م األح ش Bromothymol blue بشويى ث ىل أصسق Phenol red ف ىل أح ش Phenolphthalein ف ىنفثبن Answer اإلجببت -1 ح ض لى ولبػذة لى ت 1- Strong acid and strong base 2- ph = 7 3- Bromothymol blue. because the equivalence point equal pkin value. 3. بشويىث ىل أصسق أل مطت انتكبفؤ تسبو ل ت pkin 11
12 Item ID: Standard: Item Type: CR Subject: Acid and base Level: G12 -A DOK: 3 A solution of acetic acid formed by dissolving ( g ) of this acid in water, the volume of this solution becomes 500 ml.ph value for this solution is 4. ( the molecular mass of CH 3 COOH = 60 ) يذهىل ي د ط األسخيك حكى ي إرابت ) جى ) ي هزا انذ ط في ان بء دجى هزا ان ذهىل أصبخ 500 يم. قي ت ph نه ذهىل = 4. ( انكخهت انجزيئيت ل = CH 3 COOH )60 1- Write the dissociation equation of for this acid -1 أكخب يعبدنت حفكك هزا انذ ط 2- Calculate the Concentration of H + ions. -2 أدسب انخشكيز أليى بث + H 3- Calculate the value of Ka -3 أدسب قي ت Ka 4- Calculate the value of pka -4 أدسب قي ت pka 1- CH 3 COOH CH 3 COO - + H + 2- [H + ] = 10 -ph = 10-4 M 3- [CH 3 COOH ] = m M.wt x V = M Ka = CH3COO [H+] [CH3COOH] = 10-4 x 10-4 = 1.7x10-5 M pka = -log Ka = -log 1.7x10-5 =
13 Item ID: Standard: Item Type: CR Subject: Acid and base Level: G12 -A DOK: 2 1-What is the main buffer solution in the blood? 1 -يب ان ذهىل ان ظى انشئيسي في انذو 2- Explain (by equations) how this buffer solution keeps ph value in the blood constant when acids or bases are added. 2- فسش )ببن عبدالث ) كيف يبقي هزا ان ذهىل ان ظى قي ت ph نهذو ثببخت ع ذ إظبفت أد بض أو قىاعذ. 1- H 2 CO 3 with HCO 3-2- When acid is add it react, most will combine with HCO 3 - and ph is only change slightly (equilibrium shift right) ػ ذ إضبفت ح ض تفبػم يؼظ ه يغ 3 HCO فتتغ ش ل ت ph تغ ش طف ف فمظ ) ضاح االتضا نه ) H + + HCO - 3 H 2 O + CO 2 Add base, OH - will reacts with H + and remove H +.CO 2 will react with water and the ph change slightly ph فمظ تغ ش بئضبفت لبػذة تتفبػم أ ى بث - OH يغ أ ى بث + H طف ف ( ضاح االتضا حى ان سبس ) وتض هه. ف تفبػم CO 2 يغ ان بء وتتغ ش ل ت H + + HCO 3 - H 2 O + CO 2 13
14 Item ID: Standard: Item Type: CR Subject: Acid and base Level: G12 -A DOK: 2 A buffer solution prepared by the adding 20.0 grams of HF and 21.0 grams of NaF to enough water to make L solution. The Ka of HF is 7.2 x What is the ph of this solution? يحهىل ي ظى حضش بئضبفت 20.0 جشاو ي HF و 21.0 جشاو ي NaF يغ ك ت كبف ت ي ان بء نؼ م نتش ي ان حهىل. ل ت Ka ل HF هى x يب ل ت ph نهزا ان حهىل [ HF ] = m M.wt x V = x 2 = 0.5 M [ NaF] = x 2 = 0.25 M ph = pka + log [A - ] [A] = -log [7.2 x 10-4 ] + log = ( -0.3) =
15 Item ID: Standard: Item Type: CR Subject: Acid and base Level: G12 -A DOK: 3 If ( 1.7 g ) of silver nitrate AgNO 3 is dissolved with ( 14.5 g ) of sodium chloride NaCl in 200 ml water. Is there any precipitate will occur of the silver chloride in this reaction? Show your answer. إرا أر ب 1.7 جشاو ي تشاث انفضت AgNO 3 يغ 14.5 جشاو ي كهىس ذ انصىد ىو NaCl ف 200 يم ي ان بء. هم تكى أ ساسب ي كهىس ذ انفضت ف هزا انتفبػم أكتب كم يب تمىو به [ Ksp for AgCl = 1.8 x ]. [ AgNO 3 ] = [NaCl] = x x 0.2 = M = 1.24 M تفكك تبو ف ان بء [ AgNO 3 ] = [ Ag + ] complete dissociation in water = M تفكك تبو ف ان بء [NaCl] = [ Cl - ] complete dissociation in water = 1.24 M Qsp (solubility product) for AgCl = [ Ag + ] [ Cl - ] حبصم اإلرابت = x 1.24 = 5.7 x10-2 Qsp (solubility product) is more than Ksp. So, there is a precipitate and the solution is supersaturated حبصم اإلرابت أكبش ي Ksp نزنك تكى ساسب وان حهىل فىق يشبغ. 15
16 Item ID: Standard: 21-1 Item Type: CR Subject: Acid and base Level: G12 -A DOK: 2 Calculate the heat of combustion for sugar C 12 H 22 O 11 when we burned 5 g of sugar in bomb calorimeter the temperature of 200 cm 3 of pure water is raised from 25 0 C to 40 C o ( Density of water = 1g/ 0 Cm 3 ) Specific heat of water = 4.2j.g -1. o C -1 أحسب حرارة األحتراق للسكر C 12 H 22 O 11 عندما نحرق 5 جرام منه ف مسعر فترتفع درجة حرارة 200 cm 3 من 1- o الماء المقطر من 25 س إلى 40 س ( كثافة الماء = 1 جم/ سم ) والحرارة النوع ة للماء = 4.2 جول.جم. س Q = m x c x Δ t = = 200 x 4.2 x ( ) = j heat combustion for sugar ΔH c = 342 x = j / mole 5 16
17 Item ID: Standard: 21- Item Type: CR 2 Subject: Acid and base Level: G12 -A DOK: CH 3 NHNH 2 (l) + 5 N 2 O 4 (l) Δ 4 CO 2 (g) + 12 H 2 O (l) + 9 N 2 (g) Calculate the enthalpy change for the reaction using the standard enthalpy change data provided. أحسب انتغ ش ف ان حتىي انحشاس نهتفبػم يستخذيب ل ى انتغ ش ف ان حتىي انحشاس انتبن ت Substance ΔH f / kjmol-1 CH 3 NHNH 2 (l) +53 N 2 O 4 (l) -20 CO 2 (g) -393 H 2 O (l) -286 H = Hp Hr = [ (4 x-393 )+ ( 12 x 286 ) + ( 9 x 0 ) ] - [ (53 ) + ( 5 x -20 ) ] = ( ) - ( -47 ) = kjmol -1 17
18 Item ID: Standard: 21-2 Item Type: CR Subject: Acid and base Level: G12 -A DOK: 2 using the following equations. ببسخخذاو ان عبدالث انخبنيت ½N 2(g) + 3/2H 2(g) -----> NH 3(g) H = kj/mol ½H 2(g) + ½Cl 2(g) > HCl (g) H = kj/mol ½N 2(g) + 2H 2(g) + ½Cl 2(g) -----> NH 4 Cl (s) H = kj/mol Calculate أدسب : 1- ΔH for the following reaction: : نهزا انخفبعم ΔH.1 NH 3 (g) + HCl(g) -----> NH 4 Cl (s) 2- Calculate the amount of energy formed when 5.6 g of NH 4 Cl is formed 2. أحسب ك ت انطبلت ان بتجت ػ ذ تكى 5.6 جى ي NH 4 Cl NH 3 (g) -----> ½N 2 (g) + 3/2H 2 (g) H = kj/mol HCl(g) -----> ½H 2 (g) + ½Cl 2 (g) ) H = kj/mol ½N 2 (g) + 2H 2 (g) + ½Cl 2 (g) -----> NH 4 Cl(s) H = kj/mol NH 3 (g) + HCl(g) -----> NH 4 Cl (s) H = = kj/mol 2- انطبقت ان بحجت ع ذ حكىي 5.6 جم من NH 4 Cl Kj = 5.6 X ( 176) =
19 Item ID: Standard: 21-5 Item Type: CR أ. بسبو سعيذ فشيق االعذاد : أ. وس أ. يذ ذ عبذ انفخبح Subject: Acid and base Level: G12 -A DOK: 2 the table below shows the standard entropy of four substances at 25 Celsius انجذول انخبني يىظخ انقيى انقيبسيت نإل خشوبي ع ذ 25 س. substance Methane (CH 4(g) ) Oxygen (O 2(g) ) Carbon dioxide (CO 2(g) ) Water ( H 2 O (g) ) Substance entropy j/mol k What is the standard molar entropy change of the combustion of methane in oxygen? يب ل ت انتغ ش ان ىن ت نإل تشوب الحتشاق ان ثب ف األكسج CH 4 + 2O 2 CO H 2 O Δ S = S products - S reactants = [ ( 213.7) + ( 2x 188.7) ] [ ( 2 x 205) + ( 186.1) = = 5 j/mol k 19
20 Item ID: Standard: 21-7 Item Type: CR Subject: Acid and base Level: G12 -A DOK: 3 For the following equation: نه عبدنت انخبنيت : Calculate the a- Entropy for system األ تشوب نه ظبو -b Enthalpy Change انتغ ش ف ان حتىي انحشاس أحسب c- Entropy for surrounding األ تشوب نهىسظ ان ح ظ d- Gibbs free energy انطبلت انحشة ل Gibbs a- S system = S products - S reactants = [ ( 2 x 51.1 ) ] [( 49 ) + ( 2 X 47.3 ) ] = j/mole.c c- Δ H = H products - H reactants = ( 2 x - 94 ) ( 2 x -26.4) = Kj b- S surrounding = - Δ H = - (-135.2) = Kj/ C T 298 d- Δ G = Δ H - T Δ S system = x ( 298 x ) = j 20
21 Item ID: Standard: 21-7 Item Type: CR Subject: Acid and base Level: G12 -A DOK: 3 Gas S o ( j/k mol) CO 198 CO O Using the values in table above and the energy diagram calculate the free energy. Δ G for the following reaction at 25 C 0 ببسخخذاو انقيى في انجذول أعال ويخطط انطبقت أدسب انطبقت انذشة Δ G نهخفبعم انخبني ع ذ 25 س. Δ G = Δ H - T Δ S system = ( ) - [( 298 x )] = = j 21
22 Item ID: Standard: 21-7 Item Type: CR Subject: Gibbs free energy Level: G12 -A DOK: 3 A reaction has enthalpy change ( ΔH = -150 Kj ) at 500 K. This reaction is spontaneous above 500 K and non spontaneous below 500 K. Calculate entropy change ΔS? تفاعل له تغ ر ف المحتوى الحراري ΔH = 150- Kj عند 500 كلفن. هذا التفاعل تلقائ عند أعلى من 500 كلفن وغ ر تلقائ عند أقل من 500 كلفن. أحسب التغ ر ف األنتروب ΔS At equilibrium Δ G = 0 At 500 K ΔG = ΔH - T Δ S 0 = [ 500 X Δ S ] Δ S = 0.3 Kj / mol.k 22
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