نموذج a كيمياء من الشابردي

[شابردي]

هذا النموذج الاول و الله اني سهران عليه الين الساعه 3.5 الفجر و احتمال تكون بعض الاجابات خطأ فبالله عليكم تأكدوا لاني جايبنه من المكتبه مباشره و بالتوفيق

Exam 1(A) Choose and mark the correct answer : A1-The letter A in the chemical symbol ( ) represents: a-Atomic number b-mass number c-charge d- frequency Answer: B A2- Apple juice is an example of a a-Compound b- element c- homogeneous mixture d- heterogeneous mixture Answer: A A3- The unit of force Newton (N) is a- m s-2 b-kg m2 s-2 c- m s-1 d-kg m s-2 Answer: D A4-1.27 A is equal to a-1.27 × 10-10m b-1.27×10-3 mm c-1.27×10+3pm d-1.27×10-2m Answer: A A5-The number (0.099899) written to two significant Figures is a- 0.00999 b-0.009990 c- 1.0 ×10-2 d-1×10-2 Answer: C A6-The correct Significant Figures result of the following operation () is a-one b- two c- three d- four Answer: D A7- A particular medicine dropper delivers 22 drops of water to make 1.0 mL. The volume of one drop in cm3 is a-0.045 cm3 b-0.091 cm3 c-0.136 cm3 d- 0.182 cm3 Answer: B A8-For which of the following calculations is 9.9 ×1010 the correct answer? a-145.75+(2.3×10-1) b-79.500÷(2.5×102) c-(7.0×10-3)-(8.0×10-4) d-(1.0×104) ×(9.9×106) Answer: D A9-Cesium atoms are the largest naturally occurring atom . The radius of cesium atom is 2.62 A. How many cesium atoms would have to be laid side by side to give a row of cesium atoms 2.54 cm long ? Assume the atoms are spherical a-4.85×107 b-1.91×107 c-3.82 ×107 d-5.73×107 Answer: B A10-The international prototype of the kilogram is a cylinder made from an alloy that is 90.000% platinum and 10.000 % iridium. How many moles of Pt are in the cylinder ? a-4.62 b-0.52 c-3.133×1023 d- 2.78×1024 Answer: A A11-The number of neutrons (n) and protons (p) in the element zinc () is a-30 n, 28 p b-35 n , 30 p c-31 n , 30 p d-35 n ,28 p Answer: B A12- Silver occurs in nature as mixture of two isotopes : and .The number of protons in both isotopes ( and ) is a- The same b- bigger in isotopes c- smaller in isotopes d-none of the above Answer: A A13- How many moles of sulfur are there in 3.07 ×1023 sulfur – atoms ? a-0.05 mol b-1.0 mol c 1.5 mol d-2.0 mol Answer: A A14-Sodium hydrogen carbonate , commonly called “bicarbonate of soda “ is used in many commercial products to relieve an upset stomach .It has the simplest formula NaHCO3 . The percentage composition of sodium is a—27.38% b-1.20% c-14.29% d-57.14% Answer: A A15-For the reaction: 2 Pلاخ (s) +3 O2 (g) → 2 PoS (s) + 2 SO2 (g) If 5.30 mol of PbS reacts with oxygen , how many moles of oxygen are needed? a-0.0252 b-7.95 c 1.35 d- 5.30 Answer: B A16-Naphthalene , contains only carbon and hydrogen .Combustion of a 1.000 g sample of naphthalene gives 0.562 g of water H2O .what is the mass percent of hydrogen in 1.000 g naphthalene ? a-6.24% b-93.7% c-0.0642 d-0.078 Answer: A A17-The molecular of weight of the empirical formula of compound (C3H4O2) is (72 g⁄mol) if the molecular weight of the compound is (288 g⁄mol) , the molecular formula of the compound is a-C6H8O4 b- C12H16O8 c-C9H12O6 d-C18H24O12 Answer: B A18-The number of carbon-atoms in (0.5 mol) of the aminoacid alanine (CH3CHNH2COOH) is a-9.02×1023 b-2.11×1024 c-3.01×1023 d-6.02 ×1023 Answer: A A19-If 58.6 g of bromine occupies 188 mL , then the density of bromine in g⁄mL is a-312 b-31.2 c-3.12 d-0.312 Answer: D A20-1.000 milliliter (mL) equals a-10-3 m3 b-10-4m3 c-10-5m3 d-10-6m3 Answer: D A21-The morality of hydrochloric acid (HCL) prepared by dissolving 18.25 g in 400 mL is a-1.25 M b - 1.67 M c- 2.50 M d-5.00 M Answer :A A22-What volume of a 0.05 M HCL solution is required to react with 40.0 mL of 0.02 M Na2CO3 solution according the following equation : Na2CO3 + 2 HCL→2 NaCL +CO2+H2O a-32.0 mL b-16.0 mL c-8.0 mL d-24.0 mL Answer: A A23-The number of grams of sodium hydroxide (NaOH) required to prepare a 400 mL of 0.25 M (NaOH) – solution is a-4.0 g NaOH b-3.0 g NaOH c-2.0 g NaOH d- 1.00 g NaOH Answer: A A24-How many grams of SF4 (g) can theoretically be prepared from 6.00 g of SCl2 (g) and 3.50 g of NaF (s) ? The equation of reaction is 3SCl 2 (g) + 4 NaF (s) → SF4 (g) +S2Cl2 +4NaCl (s) a-21.0 g SF4 b-210 g SF4 c-2.10 g SF4 d-0.0210 g SF4 Answer: C A25-Chalcopyrite , the principal ore of copper (Cu) , contains 34.63% Cu by mass. How many grams of Cu can be obtained from 5.11 ×103 kg of the ore ? a-1.77×103 g b-1.77×104 g c-1.77×105g d-1.77×106g Answer :D A26-Which atom is most likely to from -3 ion ? a-N b-Al c-Ca d-Rb Answer: A A27-What mass of silver iodide (AgI) can be made by the reaction of 10.0 g of silver nitrate (AgNO3) with 10.0 g of sodium iodide (NaI)? a-6.91 g b- 20.74 g c-13.8 g d -27. 65 g Answer :C A28-The density of chloroform . a widely used organic solvent , is 1.4832 g⁄mL at 20°C .How many milliliters would you use if you wanted 200 g of chloroform? a-135 mL b-101 mL c-67.4 mL d-33.7 mL Answer :A A29-Iron(II) sulfate (FeSO4) is prescribed for the treatment of anemia . How many moles of FeSO4 are present in a standard 300 mg table ? a- 1.19×021 Fe2+ ions b-1.97 ×10-3 mol FaSO4 c-3.95×10-3 mol FaSO4 d-2.38×021 Fe2+ ions Answer :B A30-Acetic acid (CH3CO2H) reacts with isopentyl alcohol (C5H12O) to yield isopentyl acetate (C7H14O2) . a fragrant substance with the order of bananas .If the yield from the reaction of acetic acid with isopentyl alcohol is 45% , how many grams of isopentyl acetate are formed from 3.58 g of acetic acid and 4.75 g of isopentyl alcohol? The reaction is : CH3COOH + C5H12O→ C7H14O2 +H2O a-3.86 g b-4.56 g c-3.2 g d-2.46 g Answer: I DO NOT NO A31-The number of moles of CO2 resulted from the reaction of 3.5 moles of C2H6 with excess oxygen according to the equation 2 C2H6 + 7O2→4 CO2 +6 H2O is: a-7.0 moles b-9.0 moles c- 10.5 moles d-13.5 moles Answer: A A32-The mass of chlorine that reacts with 4.770 g of hydrogen to from hydrogen chloride according the following equation H2 + Cl2→2HCl is: a-4.770 g b-174.1 g c-84.67 g d- 169.3 g Answer: d A33-The density of sulfuric acid in a certain car battery is 1.41 g⁄mL . what is the mass of 242 mL of the liquid? a-341 g b - 348 g c-332 g d-288 g Answer :A A34-How many grams of KOH is required to prepare a 0.25 liter of 0.3 M KOH solution ? a-5.6 g KOH b-6 g KOH c- 4.2 g KOH d-12 g KOH Answer: C A35-The molecular formula of a compound having a molecular weight 28 (g /mol) and an empirical formula CH2 is a-C6H6 b-C6H12 c-C2H2 d-C2H4 Answer: D A36-Genes are considered to be composed of a substance known as DNA . In particular sample , the average mass of DNA molecule is 1.0×10-15 g . Calculate the molecular mass of DNA a-6.02×108 g⁄mol b-6.02×109 g⁄mol c- 6.02×107 g⁄mol d- 6.02×1010 g⁄mol Answer: B A37-In an experiment , the actual yield was 5.35 g and the theoretical yield was 8.3 g , what is the percentage yield of the product ? a-52.4% b-64.5% c-40.4% d- 76.5% Answer: B A38-The molecular weight of NaOH is a-56 g⁄mol b-63 g⁄mol c-16 g⁄mol d-40 g⁄mol Answer: D A39-The element with the number of protons=20 , neutrons=20 ,and electrons=20 is a-Ca b-Se c-K d-Au Answer: A A40- 0.90 g of sample contains 0.80 g carbon and 0.10 g hydrogen . What is the empirical formula of the compound? a-C2H3 b-CH3 c-CH2 d-CH Answer:A

[تخصص 13]

جزاك الله خير
وربي يوفقك وتجيب الفل مارك وان شاء الله مابيضع تعبك

مجرد اقتراح ..اذا هي ورق اعملها بالاسكنر اريحلك
ومشكور

[slashik]

ماشاء الله ياشابردي..

لقد قمت بعمل رائع<<<<متأثر من الأفلام

لا بالفعل..عمل جبار..يستحق الإشادة<<<<متأثر من الإعلانات إللي تجي بعد اللأفلام
الله يجزاك خير عن كل واحد فينا ..وما يضيع تعبك..ويجعلها في ميزان حسناتك ..
ورح يجي اليوم إللي تشوف فيه ثمرة تعبك وجهدك..

بس تعال دقيقة..ماتحس إنه اللون الأحمر طغى بشكل كلي على جمالية محتوى الموضوع>>تقول اليوم عيد الحب..
أقصد ماني قادر أثبت عيني على السطر..اللون واحد..والحروف صغنطوطة..ومافي فواصل بين الأسئلة..

وإنت في كلية الطب..يعني المفروض تعرف تأثير ذلك على العين..أليس كذلك<<<أفتى

بس من جد..أول ماطالعت في الصفحة..طار النوم ولا عاد جاني..قال بيجي بكرة الصبح..قلتله ماعليك..أول ماتجيني
أفتح موضوع الأخ شابردي وأطيرك..<<خلى الموضوع محطة إلكترونية لتطيير النوم..

أمزح..ياشابردي..بس لحق وعدل على الموضوع..على أقل تقدير كبر حجم الخط..

كان معاك خلف الميكرفون..
أقصد خلف الشاشة والكيبورد ..

المبـــــــــslashikـــــــــــدع

[تخصص 13]

لحظة لحظة دي اسئلة الاختبار توني استوعب
لا تلوموني شوفوا الساعة كم

مره مشكور

[تخصص 13]

لحظ لحة لحظة احنا مختيرنا دا نموذج ايه <<والله اني مره متنحة اروح انام احسلي
بس ع العموم مشكور

[slashik]

من زيني أنا إللي مسوي فاهم..

بس الرجال تعب عالموضوع..يعني لازم تقولي فاهمة بطريقة أو بأخرى..

الظاهر إنه هذه الأسئلة إللي في المكتب الإلكترونية..أخذ منها نموذج aونزلها هنا بأجوبتها..

والهدف من الحركة هذه ما أدري..بس نقول شكرا ياشابردي وماقصرت

[funtoon]

ثآآآآآآنكس ،، وكلو في ميزان حسناتك

[re-mexx]

الحين عصير التفاح مركب ولا مخلوط متجانس ؟؟

[funtoon]

المشاركة الأصلية كتبت بواسطة re-mexx الحين عصير التفاح مركب ولا مخلوط متجانس ؟؟

خليط متجانس

[الفنانة]

جزاك الله خير ^_^