The Islamic University of Gaza

General Chemistry A.(ChemA 1301) / /

Chemistry Department

Time: 2 hours
50
اسم الطالب...... الرقم الجامعي ...... اسم المدرس......

Choose the correct answer:

1- Which of the following is is not an example of a chemical reaction.

a) the condensation of water vapor b) a burning candle

c) the formation of polyethylene from ethylene d) the rusting of iron

2- Which one of the following is an intensive property?

a) mass b) temperature c) heat content d) volume

3- Which one of the following compounds is chromium(III) oxide?

a) Cr2O3 b) CrO3 c) Cr3O2 d) Cr3O

4- The volume of a drop of water is about 0.05 mL. How many atoms of hydrogen are there in a drop of

water? (The density of water is 1.00 g/ mL).

a) 3.35x 1021 atoms b) 6.68x 1024 atoms

c) 1.67x 1021 atoms d) 3.35x 1026 atoms

5- Consider the following equation: 4 NH3 (g) + 7 O2 (g) → 4 NO2 (g) + 6 H2O (g)

What mass of of NO2 can be produced by reacting 43.9 g of ammonia with 258 g of oxygen

a) 212 b) 178 c) 119 d) 0.954

6- Which one of the following is not true concerning 2.00 L of 0.100 M solution of Ca3(PO4)2?

a) This solution contains 0.200 mol of Ca3(PO4)2.

b) This solution contains 0.800 mol of oxygen atoms.

c) 1.00 L of this solution is required to furnish 0.300 mol of Ca2+ ions.

d) There are 6.02 × 1022 phosphorus atoms in 500.0 mL of this solution.

7- A solution is prepared by mixing 50.0 mL of 0.100 M HCl and 10.0 mL of 0.200 M NaCl.

What is the molarity of chloride ion in this solution?

a) 0.183 b) 8.57 c) 3.50 d) 0.117

8- The net ionic equation for the reaction between aqueous solutions of HF and KOH is:

a) HF + KOH → H2O + K+ + F-

b) HF + OH- → H2O + F-

c) HF + K+ + OH- → H2O + KF

d) H+ + OH- → H2O

9- A 13.8 mL of 0.176 M H3PO4 (aq) is to be titrated with 0.110 M NaOH (aq). What volume (mL) of

NaOH will it take to reach the equivalence point?

a) 7.29 b) 22.1 c) 199 d) 66.2

10- For which one of the following reactions is ΔH°rxn equal to to ΔHf° of the product?

a) N2 (g) + 3H2 (g) → 2NH3 (g)

b) (1/2) N2 (g) + O2 (g) → NO2 (g)

c) 6C (s) + 6H (g) → C6H6 (l)

d) 12C (g) + 11H2 (g) + 11O (g) → C6H22O11 (g)

11- When 0.7521 g of benzoic acid was burned in a bomb calorimeter containing 1000. g of water,

a temperature rise of 3.6 0C was observed. What is the heat capacity of the bomb calorimeter,

excluding the water? The heat of combustion of benzoic acid is -26.42 kJ/g.

a) 3.157kJ/ 0C b) 1.34 kJ/ 0C c) 11.36 kJ/ 0C d) 1.80 kJ/ 0C

12- Given that:

2 H2(g) + O2(g) → 2 H2O(l); ΔH° = ─571 kJ/mol

C3H4(g) + 4 O2(g) → 3 CO2(g) + 2 H2O(l); ΔH° = ─1941 kJ/mol

C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l); ΔH° = ─2220 kJ/mol

Calculate the ΔH° value for the reaction C3H4(g) + 2 H2(g) → C3H8(g)

a) ─292 kJ/mol b) +292 kJ/mol c) +850 kJ/mol d) ─850 kJ/mol

13- Which one of the following is an allowable set of quantum numbers for an electron?

a) n = 1, l = 1, ml = 1, ms = +1/2

b) n = 2, l = 1, ml = -1, ms = -1/2

c) n = 3, l = 2, ml = -1, ms = 0

d) n = 4, l = 2, ml = 3, ms = -1/2

14- When electrons in an atom in an excited state fall to lower energy levels, energy is

a) absorbed, only b) released, only

c) neither released nor absorbed d) both released and absorbed

15- Which of the following is the electron configuration of the Fe3+ ion?

a) [Ar]3d5 b) [Ar]4s13d5 c) [Ar]4s23d3 d) [Ar]3d6

16- Which of the following series is correctly arranged in order of increasing radius?

a) K+ < Ca2+ < Ar < Cl-

b) Cl- < Ar < K+ < Ca2+

c) Ca2+ < Ar < K+ < Cl-

d) Ca2+ < K+ < Ar < Cl-

17- In the generation of most anions, the energy change (kJ/mol) that ______an electron is ______.

a) removes, positive b) adds, positive

c) removes, negative d) adds, negative

18- the lattice energy increases as ionic radius ______and as ionic charge ______.

a) decreases, increases b) increases, decreases

c) increases, increases d) decreases, decreases

19- In which of the lists below are the atoms arranged in order of increasing size (increasing atomic radius)?

a) Si < In < Ge < N b) N < In < Ge < Si

e) N < Si < Ge < In f) N < Ge < Si < In

20- In an actual SF4 molecule, the indicated angle would be…

a) Greater than 90°
b) Equal to 90°
c) Less than 90°
d) Cannot be predicted /

21- Calculate the DHo in kJ for the following reaction using the given bond energies.

(C-H = 414 kJ/mol; F- F = 155 kJ/mol; H-F = 431 kJ/mol, C-F = 485 kJ/mol).

CH4(g) + 4 F2(g) → CF4(g) + 4 HF(g)

a) -1388 b) -1598 c) -1542 d) -1678

22- The formal charge on nitrogen in NO3- is ______and the equivalent resonance forms can be

drawn for NO3- are ______

a) -1, 3 b) 0, 2 c) +1, 3 d) +2, 3

23- The bond angles marked a, b, and c in the molecule below are about ______, ______, and

______, respectively.

a) 90°, 90°, 90° b) 120°, 120°, 90°
c) 120°, 120°, 109.5° d) 109.5°, 120°, 109.5° /

24- For which of the following molecules is the molecular geometry (shape) the same as the VSEPR electron

domain arrangement.

(i) PCl3 (ii) CCl4 (iii) Te Cl4 (iv) XeF4 (v) SF6

a) (i) and (ii) b) (i) and (iii) c) (ii) and (v) d) (iv) and (v)

25- The molecular geometry of the PF3 molecule is ______, and this molecule is ______.

a) trigonal planar, polar b) trigonal planar, nonpolar

c) trigonal pyramidal, polar d) trigonal pyramidal, nonpolar

26- The hybridizations of bromine in BrF5 and of arsenic in AsF5 are ______and ______,

respectively.

a) sp3, sp3d b) sp3d, sp3d2 c) sp3d, sp3 d) sp3d2, sp3d

27- The volume of a sample of gas (2.49 g) was 752 mL at 1.98 atm and 62°C. The gas is ______.

a) SO2 b) SO3 c) NH3 d) NO2

28- The density (in g/L) of SO2 at 1140 torr and 60.0°C is ______.

a) 2.42 b) 16.2 c) 5.70 d) 44.0

29- For the reaction: 2NaN3 (s) → 2Na (s) + 3N2 (g).

What mass (g) of NaN3 is required to provide 40.0 L of N2 at 25.0°C and 763 torr?

a) 1.64 b) 1.09 c) 160 d) 71.1

30- A mixture of 5.00 g SO2(g) and 5.00 g CO2(g) is placed in a 750 mL container at 50.0°C.

What is the total pressure in the container.

A) 0.192 atm b) 4.02 atm c) 6.78 atm d) 1.60 atm

IA / VIIIA
1 / 2
H / He
1.008 / IIA / IIIA / IVA / VA / VIA / VIIA / 4.003
3 / 4 / 5 / 6 / 7 / 8 / 9 / 10
Li / Be / B / C / N / O / F / Ne
6.941 / 9.012 / 10.81 / 12.01 / 14.01 / 15.99 / 19.00 / 20.18
11 / 12 / 13 / 14 / 15 / 16 / 17 / 18
Na / Mg / Al / Si / P / S / Cl / Ar
22.99 / 24.31 / IIIB / IVB / VB / VIB / VIIB / ┌──── / VIIIB / ────┐ / IB / IIB / 26.98 / 28.09 / 30.97 / 32.07 / 35.45 / 39.94
19 / 20 / 21 / 22 / 23 / 24 / 25 / 26 / 27 / 28 / 29 / 30 / 31 / 32 / 33 / 34 / 35 / 36
K / Ca / Sc / Ti / V / Cr / Mn / Fe / Co / Ni / Cu / Zn / Ga / Ge / As / Se / Br / Kr
39.10 / 40.08 / 44.96 / 47.88 / 50.94 / 52.00 / 54.94 / 55.85 / 58.93 / 58.69 / 63.55 / 65.39 / 69.72 / 72.61 / 74.92 / 78.96 / 79.90 / 83.80
37 / 38 / 39 / 40 / 41 / 42 / 43 / 44 / 45 / 46 / 47 / 48 / 49 / 50 / 51 / 52 / 53 / 54
Rb / Sr / Y / Zr / Nb / Mo / Tc / Ru / Rh / Pd / Ag / Cd / In / Sn / Sb / Te / I / Xe
85.47 / 87.62 / 88.91 / 91.22 / 92.91 / 95.94 / (98) / 101.1 / 102.9 / 106.4 / 107.9 / 112.4 / 114.8 / 118.7 / 121.8 / 127.6 / 126.9 / 131.3

J Good Luck J

4