سيليوشن ميجر كيمستري 101

يعطيك العافيه


ودي أحمله ولا ودي

 

الحمد لله على كل حال

 

اول مرة في اختبار اختيارات اكون مابغى اشوف السليوشن

 

مايحمل ..... يطلعلي ملف تعليم انقلش

 

ياليت احد يرفعه على رابط ثاني

 

الرابط شغال, بس افتحه وانتظر 20 ثانية بعدين اختر" انشاء رابط التحميل" بعدين بيفتح صفحة ثانية اختر منها "اضغط هنا لتحميل الملف"

 

1. A physical property is:

A) a property that a sample displays without changing its composition.
B) the ability of a sample to undergo a chemical change.
C) a substance made of a single type of atom.
D) always visible.
E) a property which can not be determined without changing in composition.


2. How many significant figures should the answer to the following calculation have?

(1.4312 - 1.1 x 10-2) ÷ (1.0712 x 10-4)

A) 4
B) 5
C) 3
D) 2
E) 1


3. It takes light one second to travel 2.998 × 108 m. How many kilometers does light travel in exactly 24 hours ?

A) 2.590 × 1010 km
B) 1.086 × 109 km
C) 7.195 × 109 km
D) 4.317 × 108 km
E) 1.086 × 108 km


4. Choose the pure substance from the list below.

A) sugar
B) coffee
C) air
D) lemon juice
E) milk


5. Calculate the density in g/cm3 of a 15.0 lb block of aluminum which has a volume of 0.6657 U.S. gal. (1 gal = 3.785 L, 1 lb = 453.6 g)

A) 2.70 g/cm3
B) 22.5 g/cm3
C) 11.5 g/cm3
D) 0.371 g/cm3
E) 2.25 g/cm3


6. Which one of the following elements is most likely to be a good conductor of electricity?

A) V
B) N
C) S
D) He
E) Cl


7. In his oil-drop experiment, Millikan was able to:

A) measure the charge of the electron with a great precision.
B) determine the ratio of the electric charge to the mass of a single proton.
C) prove that different samples of a given compound always contain that same mass ratio of its elements.
D) verify the spontaneous emission by radioactive substances.
E) show that Thomson’s atomic model can not be correct.


8. Bromine (Br) has two isotopes, with masses of 78.92 and 80.92 amu. What is the natural abundance of the heavier isotope?

A) 49%
B) 53%
C) 13%
D) 68%
E) 87%


9. Predict the formula of the binary compound which will form from the elements galiium and oxygen.

A) Ga2O3
B) Ga3O2
C) GaO3
D) Ga3O
E) Ga3O4


10. The correct name of the compound HIO2 is

A) iodous acid
B) hypoiodous acid
C) hydrogen iodite
D) iodic acid
E) hydrogen monoiodo dioxide


11. What is the coefficient for H2O when the following equation is balanced with the smallest whole numbers?
CH4 (g) + NH3 (g) + O2 (g) → HCN (g) + H2O(g)

A) 6
B) 5
C) 8
D) 4
E) 7


12. Propane (C3H8) reacts with oxygen to produce carbon dioxide and water. How many grams of propane is needed to produce 38.0 grams of carbon dioxide?

A) 12.7 g
B) 4.23 g
C) 0.236 g
D) 22.1 g
E) 44.2 g


13. Under appropriate conditions, nitrogen and hydrogen undergo a combination reaction to yield ammonia:
N2 (g) + 3 H2 (g) → 2NH3 (g)
If the reaction yield is 87.5%, how many moles of N2 are needed to produce 51.0 g of NH3?

A) 1.71
B) 0.166
C) 1.00
D) 1.16
E) 2.32


14. How many hydrogen atoms are present in 1.00 g of potassium ammonium sulfate?

A) 1.57 x 1022
B) 4.33 x 1021
C) 1.73 x 1022
D) 3.93 x 1021
E) 2.33 x 1021


15. Determine the mass percent of iron in Fe4[Fe(CN)6]3.

A) 45 %
B) 26 %
C) 33 %
D) 58 %
E) 29 %


16. Which one of the following aqueous solutions will react with aqueous potassium chloride to give precipitates?

A) lead(II) nitrate
B) calcium chlorate
C) iron(III) bromide
D) barium iodide
E) sodium sulfate


17. Three different substances, A2X, A2Y, and A2Z, were dissolved in water with the following results. (Water molecules are omitted for clarity.) Which of the substances is the strongest electrolyte, and which is the weakest? Select the correct statement:



A) A2Z is the strongest electrolyte and A2Y is the weakest electrolyte.
B) A2X is the strongest electrolyte and A2Y is the weakest electrolyte.
C) A2Y is the strongest electrolyte and A2X is the weakest electrolyte.
D) A2Y is the strongest electrolyte and A2Z is the weakest electrolyte.
E) A2Z is the strongest electrolyte and A2X is the weakest electrolyte.


18. The reaction of 110. g of magnesium peroxide (MgO2) with 0.350 L of a hydrobromic acid solution containing 2.72 g HBr per mL proceeds according to the following balanced equation:

MgO2(s) + 2 HBr(aq) → H2O2(aq) + MgBr2(aq)

What mass of which reactant is left unreacted after the reaction is complete?

A) 636 g HBr
B) 55.0 g MgO2
C) 66.5 g HBr
D) 9.23 g MgO2
E) 360. g MgO2


19. Which one is the oxidizing agent in the following reaction?

5H2O2 + 2MnO4– + 6H+ → 2Mn2+ + 8H2O + 5O2

A) MnO4–
B) H2O2
C) H+
D) Mn2+
E) O2


20. A 0.845 g sample of the an unknown diprotic acid requires 26.66 mL of 0.117 M NaOH to be completely neutralized. Calculate the approximate molar mass of the acid.

A) 542 g/mol
B) 341 g/mol
C) 641 g/mol
D) 271 g/mol
E) 135 g/mol

 

الحين اجابات كلها a ولاايش ؟؟؟ انلحس مخي

 

اسوآ اختبار في تاريخي الجامعي!

 

يعطيك العافية

 

الشلوشن مضروب أو للأسف غير مضبوط

 

الصراحة في بعض الإسالة أنا شاك في هالشي

 

خبري الاوكسيديزنق أيجنت = اللي يكسب إلكترون..
بس MnO4- فقد الكترون..

 

خبري الاوكسيديزنق أيجنت = اللي يكسب إلكترون..
بس MnO4- فقد الكترون..

 

عدل كلامك المنجنيز في المركب = +7 وفي البرودكتس +2 يعني الجواب Mn+2

 

الايجنت مفروض يكون من المتفاعلات

 

ويش سالفة السلوشن ! الحين كل اجابات السلوشن a ؟؟؟؟ تكفون يا شباب