Final exam 002 PDF

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final exam covering most of the important material in the class...

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Name: Amjad samra Net ID: samraa UNM ID: 101909340 THIS TEST IS MEANT TO TAKE two HOURs, WHEN YOU ARE FINISHED WITH THE TEST EMAIL IT BACK TO

1.PLEASE ANSWER ALL QUESTIONS ON THIS WORD DOCUMENT. (Bold the answer) 2. Save file: Test_2_yourlastname 3. SCATCH PAPER SHOULD BE UPLOADED TO LEARN. 4. ROUND ALL ANSWERS TO TWO DECIMAL POINTS, UNLESS OTHERWISE NOTED! 5. Read each question carefully Multiple choice (2 points) Question 1 What is the number of electrons, neutrons, and protons on a neutral atom of A) B) C) D)

90,90,232 90,232,90 90,142,90 90,90,232

Question 2 What defines a strong electrolyte? A) B) C) D)

A compound that completely ionizes in water A compound that generates electricity A compound that partially ionizes in water A compound that is soluble in water

Question 3 What is the number of valance electrons found in Krypton? A) This Question makes me weak B) 8 C) 36

232 Th ? 90

D) 18 Question 4 Based on the MO diagram of dicarbon (C2), will this molecule be…. A) B) C) D)

Paramagnetic Diamagnetic Hellamagentic Nadamagnetic

Question 5 Which of the following gases has the highest root mean square speed at 300K? A) B) C) D)

Elemental Helium Elemental Fluorine Elemental iodine Their speeds are equal because the temperature is the same

Question 6 The First Law of Thermodynamics says: A) The force of an object is equal to the mass of the object times the acceleration of the object B) The energy change of a system is equal in magnitude but opposite to the energy change of the surroundings C) I give up officer, I am under arrest D) The volume of fluid displaced by an object submerged or partially submerged is equal to the volume of the object E) The total entropy of an isolated system can never decrease over time and is constant if and only if all processes are reversible.

Question 7 What is the Energy of a 530 nm light? A) B) C) D)

4.20 x 10-19 J 3.75 x 10-19 J 2.45 x 10-18 J 226 kJ/mol

Question 8 What is the molecular geometry of the following Lewis dot structure according to VESPER?

A) B) C) D)

Tetrahedral Trigonal bipyramidal Octahedral Linear

Question 9 What is electron configuration of S4+? A) 1s2 2s2 2p6 3s2 3d2

B) 1s2 2s2 2p6 3s2 3p6 C) 1s2 2s2 2p6 3s2 D) [Ne] 3s2 Question 10 Which of the compounds is most likely to be ionic? A) B) C) D)

I2 CI4 HI MgI2

Question 11 What is the oxidation state on Carbon in CaCO3? A) B) C) D)

+4 -4 0 +2

Question 12 What is the hybridization of the carbons in the compound C2H2? (Lewis Dot will help) A) B) C) D)

sp sp2 sp3 sp3d2

Question 13 Which of the following pairs are considered to be isotopes of each other? A)

14 N 31 P , 7 15

B) C) D)

24 Mg , 12 200 Hg , 80 53 Cr , 24

24 2 Mg 12 201 Hg 80 53 V 23

+

Question 14 Oxidation can not occur with______ A) B) C) D)

Reduction Oxygen Acid Air

Question 15 The allowed values for the magnetic spin quantum number (ml) are? A) B) C) D)

Any whole numbers +0.5 and -0.5 Any whole number from 0 to n-1 Any whole number, including 0 determined from the angular momentum quantum number

Question 16 What does the angular momentum quantum number determine? A) B) C) D)

Shape of molecule Shape of Orbital Orientation of Orbital Energy Level of Orbital

Question 17 What principle states that the lowest-energy electron configuration of an atom has the maximum number of unpaired electrons in degenerate orbitals? A) B) C) D)

Hund’s Rule Aufbau principle Pauli’s exclusion principle Marcus Theory

Question 18 1 mol of an ideal gas at 300 K and 1 atm takes up how much volume? A) B) C) D)

24.62 L 273L 3325 L 22.4 L

Question 19 What is the molar mass of U(NO3)6? A) B) C) D)

306 g/mol 306.00 amu 610.03 g/mol 610.03 amu

Short Answer (5 points) Explain the difference between the plum pudding model, Rutherford’s and Bohr’s model of the atom? The plum pudding is the first atomic model that proved negative particles (electrons) Rutherford model was the gold foil experiment that proved that the atom is mostly empty with positive charged and containing alpha particles particles when they deflected off of something hard in the gold foil, which plum pudding does not account for this hard particle Bohrs model stated that the atom cinsists of a nucleus with positively charged particles in it with electrons orbiting.around the nucleus

Why can period 3 have an “expanded octet” (use the special name in the previous answer) but period 2 cannot? Im done Period 3 is an exception to the octet rule and its elements’ valence electrons can hold the extra electrons by having access to the d orbital so hybridization is occured by mixing d with s and p orbitals however period 2 follows the octet rule.and doesn’t have access to d orbitals (no hypervalncy)

When a solution of Strontium Chloride is mixed with a solution of Sodium Sulfate, a white solid forms. Write, ionic equation and net ionic equation of this reaction. + Sr2+(aq)+2Cl(aq)+2Na (aq)+SO42-(aq) = 2Na+(aq) + 2Cl(aq) + SrSO4(s)

Net ionic equation: Sr2+(aq) + SO42-(aq) = SrSO4(s)

MATH SECTION (Because this is important) Question 23 In the combustion reaction between propane (C3H8) and elemental oxygen (O2)……

 Write the balanced chemical reaction (assume all molecules are in the gaseous state) C3H8 + 5O2 = 3CO2 + 4H20

If we use 40.00 g of propane and an excess of oxygen how much water vapor is produced? 65.38 g of H2O 

 If 17.56 g of water is produced, what is the percent yield of the reaction? 27% (26.85%)

Question 24 Jersey Mike's Subs Giant #56 Big Kahuna on white bread is 1570 Calories. What is the VOLUME of water that can be raised in temperature from 25 C to 100 C if we use that much energy? Assume that the water does not go through a phase/state change and that the transfer of

energy is 100 % efficient. The conversion factors you need are: 1 calories = 4.184 J, Cs of water = 4.186 joule/gram °C .

20923.33 ml of H20

Question 25 What is the enthalpy of the combustion of Hexatriacontane (C 36H74), is it exothermic or endothermic? Molecule Hexatriacontane (C36H74) Oxygen (O2) Carbon Dioxide (CO2) Water (H2O) Write the balanced chemical reaction of this reaction:

2C36H74 + 109O2 = 72CO2 + 74H20 ΔHrxn= -47959.42 KJ

ΔHf (kJ/mol) 102.51 0 -398.5 -257.6

Question 26 If we consider bond enthalpy, what is the enthalpy of the following reaction:

Is the reaction balanced? (funny I should be asking this)

C2H6O + O2 = CO2 + H2O ENTHALPY = 895 KJ Bond H-C C-C O=O O=C H-O C-O

Bond enthalpy (kJ/mol) 420 350 500 800 465 360...