Chem 110, Final Exam

Chem 110, Final Exam.

Time : 2 hours

Name: / Useful information
Number:
Section: / h = 6.63 x 10-34 J S
C=3.00 x 108 m/s
RH= 2.18 x 10-18 J
R=0.0821 L atm mol-1 K-1
R=8.314 J mol-1 K-1

With the best wishes

Dr. Salwa AL-Rashid

Dr. Ehteram Noor

Directions: For each of the following questions, choose the letter that best answers the question and place it on your answer sheet.

(1) The total number of atoms represented by Ca(C2H3O2)2

(A) 17

(B) 15

(D) 13

(2) Which of the following compounds are correctly named?

(A) Cu(NO3)2, copper (II) nitrate

(B) SrSO3, strontium sulfate

(D) Ba3(PO4)2, tribarium diphosphate

(3) A magnesium ion, Mg2+, has

(A) 12 protons and 13 electrons.

(B) 24 protons and 26 electrons.

(D) 24 protons and 22 electrons.

(4) Hexachlorophene, has the molecular formula C13H6Cl6O2. What is the weight percent of carbon?
(Atomic weights: C = 12.01, H = 1.008, Cl = 35.45, O = 16.00).

(A) 36.4

(B) 39.2

(D) 39.2

(5) The molecular weight of nitroglycerin, C3H5N3O9, is 227.10. How many moles of oxygen are in 4.5 g of nitroglycerin?

(A) mol*

(B) mol

(D) mol

(6) A compound of sulfur (S) and oxygen (O) is 40.1% of S by mass. What is the empirical formula for the compound?

(A) SO4

(B) S2O3

(D) SO

(7) Sucrose (table sugar) has empirical formula CH2O and molecular weight 360. The molecular formula of sucrose is

(A) C6H12O6

(B) C360H720O360

(D) C12H24O12

(8) The reaction of 37.0 g C6H12O in the presence of acid yields 25.0 g C6H10. What is the percent yield of the reaction :

(Atomic weights: C = 12.01, H = 1.008, O = 16.00).

(A) 76.2

(B) 83.2

(D) 79.2

(9) How many moles of lithium chlorate (LiClO3) are in 153 mL of a 1.764 M solution?

(A) 0.270

(B) 0.340

(D) 1.153

(10) A 20.00 mL sample of 0.1015 M nitric acid is introduced into a flask, and water is added until the volume of the solution reaches 250. mL. What is the concentration of nitric acid in the final solution?

(A) 1.27 M

(B) 8.12 ´ 10-3 M

(D) 3.25 ´ 10-2 M

(11) What is the molarity of a saturated solution of NiCO3? (= 6.6 x 10-9)

(A) M

(B) M

(D) M

(12) What is the molecular mass of a gas whose density at STP is1.78 g/L ?

(A) 1.78 g/mol

(B) 22.4 g/mol

(D) 13.3 g/mol

(13) 10 g of nitrogen gas and 10 g of helium gas are placed together in a 10 L container at 25oC. The total pressure is: (Atomic weights: N = 14.01, He = 4.003).

(A) 69.9 atm

(B) 6.99 atm

(D) 78.6 atm

(14) The electron configuration of a neutral atom is 1s22s22p63s2. Name the element.

(A) Si

(B) Na

(D) Al

(15) Which of the following species has the most unpaired electrons? S+, S, or S–?

(A) S-

(B) S

(D) They all have the same number of unpaired electrons.

(16) Which ion is isoelectronic with Ar?

(A) Fe2+

(B) F-

(D) Ca2+

(17) Use the Aufbau principle to obtain the ground-state electron configuration of technetium (Tc).

(A) Tc: [Kr] 4d6

(B) Tc: [Kr] 5s24d5

(D) Tc: [Kr] 4d7

(18) Calculate the total number of electrons that can occupy orpitals having angular quantum number () : (A) , (B) , (C) , (D) .

(A) (A)2; (B)9; (C)10, (D)14

(B) (A)2; (B)6; (C)8, (D)14

(D) (A)2; (B)6; (C)10, (D)16

(19) Give the values of the quantum numbers associated with the last electron in 5d 7 subshell.

(A) n = 5, l = 0, ml = 0, ms= +1/2

(B) n = 5, l = 1, ml = –1, ms= –1/2

(D) n = 5, l = 2, ml = –1, ms= –1/2

(20) When an electron drops from the E3 level to the E1 level, the atom is said to undergo emission. Calculate the wavelength of the photon emitted in this process.

(A) 1.03×102 nm

(B) 1.03×10-7 nm

(D) -1.03×102 nm

(21) The least electronegative element of the following is _____.

(A) Cs

(B) Ca

(D) C

(22) Which of the following bonds is most ionic in nature?

(A) Cl-F

(B) K-O

(D) LiI

(23) In the Lewis structure of COCl2 (C is the central atom), how many lone pairs surround the carbon atom?

(A) 1

(B) 2

(D) 0

(24) The molecule not obeying the octet rule of the following is _____.

(A) SbCl5

(B) PCl3

(D) Br2

(25) Consider the reactions given below. In which case(s) will the reaction proceed more to the right by decreasing the pressure?

1. 2 CO(g) + O2(g) 2 CO2(g)

2. 2 NO(g) N2(g) + O2(g)

3. N2O4(g) 2 NO2(g)

4. Ni(s) + 4 CO(g) Ni(CO)4(g)

5. N2(g) + 3 H2(g) 2 NH3(g)

(A) 1, 4 and 5

(B) 1,2 and 3

(D) 1 and 3

(26) Consider the following reaction : having equilibrium constant K1

For the reaction , the equilibrium constant K2 can be given as:

(A)

(B) *

(C)

(D)

(27) Kp will be equal to Kc if _____.

(A)

(B) *

(C)

(D)

(28) For the reaction

The relationship between and is:

(A)

(B)

(C)

(D)

(29) The equilibrium: DH = 92.5 kJ. can be shifted toward more product formation by _____.

(A) Increasing temperature

(B) Increasing pressure

(D) Increasing the concentration PCl3

(30) Given [CS2] = 0.120 M, [H2] = 0.100, [H2S] = 0.200 and [CH4] = 8.40 x 10-5 M for the following reaction at 900oC calculate the equilibrium constant.

CS2(g) + 4 H2(g) CH4(g) + 2 H2S(g)

(A) 0.0980

(B) 0.0560

(D) 0.120

(31) The hydroxide ion concentration of lemon juice is about 2.0 x 10-12. The pH of lemon juce is:

(A)

(B)

(C)

(D)

(32) What is the pH of a 0.490 M acid solution whose Ka = 4.53 x 10-9?

(A) 5.22

(B) 8.66

(D) 9.67

(33) What is the pH of a solution of 0.28 M acid and 0.54 M of its conjugate base if the pKa = 7.93?

(A) 7.22

(B) 8.22

(D) 7.65

(34) The of in water can be given as:

(A) *

(B)

(C)

(D)

(35) Which of these is the systematic name for the compound represented below?

(A) 2-ethylbutane

(B) 3-methylpentene

(D) 3-methyl-1-hexene

(36) An example of a saturated compound is___.

(A) propane .

(B) propylene .

(D) isobutylene .

(37) The correct structure for 2,3,3 trimethylpentane is

(A)

(B)

(C)

(D)

(38) The reaction of Cl2 with CH2=CH2 to produce C2H4Cl2 is an example of a/an

(A) free radical reaction.

(B) addition reaction.

(D) ester hydrolysis.

(39) protein is____

(A) a polyscarides

(B) a saturated ester of glycerol.

(D) a polymer of amino acids.

(40) Which of these pairs are geometric isomers?

(A)

(B)

(C)

(D)