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هذا رابط موقع الدكتورة اكرام ادخلي على.. ملفات
تلقي نموذج مكتوب علييييييه اختبارك .,’ حمليه وحليه

دكتورتنا اليووم قالتلنا لو حلتوه وانتو فاهمين ماينخاف عليكِ بالاختبار والله ييسر
دعواتك بلييييييييييييييييز ,.

http://eydanish.kau.edu.sa/Show_file...0002173&Lng=AR




(1) The formulas of the phosphate ion, hydroxide ion, and the ammonium ion are represented, respectively, as
(A) PO33- , H- , NH4+
(B) PO43-- , OH- , NH4+
(C) P , OH- , NH3-
(D) none of these.
__________________________________________________ _______________
(2) Express 380 mm as nanometers.
(A) 38 nm
(B) 3.8  108 nm
(C) 3.8 nm
(D) 3.8  105 nm
__________________________________________________ ________________
(3) The melting point of nitrogen is -346°F. Express this temperature in degrees Celcius and Kelvin.
(A) -73 oC and 200 K
(B) -591 oC and 148 K
(C) -210 oC and 63 K
(D) 273 oC and 546 K
__________________________________________________ _________________
(4) The species O2- , Br-, and F- are all
(A) isotopes
(B) cations
(C) anions
(D) halogens
__________________________________________________ _________________
(5) Give the number of protons, neutrons, and electrons in
(A) 56 p , 56 n , 56 e
(B) 56 p , 130 n , 56 e
(C) 56 p , 186 n , 74 e
(D) 56 p , 74 n , 56 e
__________________________________________________ ________________
(6) Which of the following is a lloid?
(A) N
(B) Pb
(C) Mg
(D) Te
__________________________________________________ ________________
(7) Determine the mass percent of iron in Fe4[Fe(CN)6] 3
(A) 26% Fe
(B) 33% Fe
(C) 58% Fe
(D) 45.5% Fe
__________________________________________________ ________________
(8) Rutherford,s experiment with alpha particle scattering by gold foil established that
(A) a chemical reaction involves the combination of atoms.
(B) compounds are composed of atoms of more than one element.
(C) the atom,s positive charges are concentrated in the nucleus.
(D) electrons have a negative charge.
__________________________________________________ _______________
(9) The SI unit for measuring volume is the
(A) liter
(B) m2
(C) cm3
(D) m3
__________________________________________________ _______________
(10) An element X, has three stable isotopes:
Mass of Isotope (amu) Percent Abundance (%)
23.985 78.70
24.986 10.13
25.983 11.17
Calculate its average atomic mass
(A) 24.31 amu
(B) 25.00 amu
(C) 23.15 amu
(D) 33.33 amu
__________________________________________________ ___________
(11) 23Na and 24Mg both have the same
(A) number of neutrons.
(B) number of electrons.
(C) atomic number.
(D) mass number.
__________________________________________________ ____________
(12) An example of a monatomic ion is
(A) Li
(B) NH3
(C) OH-
(D) Mg2+
__________________________________________________ ____________
(13) What is the formula of ionic compound formed by barium and chlorine?
(A) BaCl
(B) Ba2Cl
(C) BaCl2
(D) BaCl3
__________________________________________________ ___________
(14) Which is the correct name for Cr2(SO4)3 ?
(A) chromium (II) sulfate
(B) chromium (III) sulfate
(C) chromium (IV) sulfate
(D) chromium(II) sulfite
__________________________________________________ ___________
(E) chromium (III) sulfate


(15) Write the formula for dinitrogen tetrafluoride
(A) N2F4
(B) NF4
(C) FN2
(D) N(II)F3
__________________________________________________ ____________

(16) Which of the following organic compounds has the highest molecular weight?
(A) C7H14
(B) C4H8O4
(C) C7H10O
(D) C2H6O
__________________________________________________ ____________
(17) How many moles of Ca atoms are in 25.7 g of CaSO4?
(A) 0.189 g
(B) 0.755 mol
(C) 4.00 mol
(D) 0.189 mol
__________________________________________________ ____________
(18) Of the following, the only empirical formula is:
(A) C3H6
(B) Na2S2O8
(C) C8H8O3
(D) O3
__________________________________________________ _____________
(19) What is the empirical formula of a compound that contains 20.9% silicon and 79.1% chlorine.
(A) SiCl4
(B) SiCl2
(C) Si2Cl5
(D) SiCl3
__________________________________________________ _______________
(20) Calculate the number of moles of H2O formed when 0.400 mole of Ba(OH)2 is treated with 1.00 mol of HClO3 according to the chemical reaction shown below.
Ba(OH 2 + 2 HClO3 → Ba(ClO3)2 + 2 H2O
(A) 0.800 mol
(B) 0.600 mol
(C) 0.500 mol
(D) 1.00 mol
__________________________________________________ _____________

(21) Calculate the percent yield of iron (Fe) if 850 g of Fe3O4 reacted with carbon and 435 g of Fe was actually isolated from the reaction mixture.
Fe3O4 (s) + 2 C(s) → 2 CO2 (g) + 3 Fe(s)
(A) 70.72 %
(B) 25.9 %
(C) 97.5 %
(D) 42.71%
__________________________________________________ ___________


(22) TNB is an organic compound has a molar mass of 213 g/mol, and an empirical formula . What is its molecular formula?
(A)
(B)
(C)
(D)
__________________________________________________ _____________
(23) The mass of one molecule of fluorine gas is about:
(A) g

(B) g

(C) g

(D) g
__________________________________________________ _______________

(24) The correct coefficients for the balanced equation below are:-
Al + H2SO4  Al2(SO4)3 + H2
(A) 2,1,2,3
(B) 2,3,1,3
(C) 2,2,2,3
(D) 1,3,1,3
__________________________________________________ ________________

(25) The molarity of a solution is defined as:
(A) number of moles of solute per kilogram of solution.
(B) number of moles of solute per liter of solution.
(C) number of grams of solute per liter of solution.
(D) number of moles of solute per kilogram of solvent

__________________________________________________ __________________
(26) What volume, in mL, of a 0.38 M solution is required to provide 3.17 g of KBr?
(Atomic weights: K = 39.10, Br = 79.90).
(A) 60 mL
(B) 90 mL
(C) 70 mL
(D) 100 mL
__________________________________________________ __________________
(27) A nitride ion, N3- , has:
(A) 7 protons and 10 electrons
(B) 14 protons and 7 electrons
(C) 7 protons and 7 electrons
(D) 7 protons and 4 electrons
__________________________________________________ __________________
(28) What volume of 3.2 M K2CO3 is needed to prepare 250 mL of a 0.200 M K2CO3 solution?
(A) 86 mL
(B) 15.6 mL
(C) 44.7 mL
(D) 10.0 mL
__________________________________________________ _________________
(29) Which of the following represents the greatest mass?
(A) 2.0  102 mg
(B) 2.0  102 cg
(C) 1.0  105 g
(D) 10.0 dg
__________________________________________________ ________________

(30) C + O2  CO2 this equation can be read as:
(A) 1 atom of carbon combines with 1 molecule of oxygen to form 1 molecule of
carbon dioxide.
(B) 1 mole of carbon combines with 1 mole of oxygen to form 1 mole of carbon
dioxide.
(C) both A and B are true.
(D) none of the above.




Answer Key:
1. B
2. B
3. C
4. C
5. D
6. D
7. D
8. C
9. D
10. A
11. A
12. D
13. C
14. B
15. A
16. B
17. D
18. C
19. D
20. A
21. A
22. A
23. C
24. B
25. B
26. C
27. A
28. B
29. B
30. C


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