Reslan F23 Midterm 2 Chem 14A

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University of California, Los Angeles *

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14A

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Chemistry

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Feb 20, 2024

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pdf

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23F-CHEM-14A-LEC-1 Midterm 2 TOTAL POINTS 47.5 / 50 QUESTION 1 1 Q1 3 / 5 + 3 pts explains trend with ionization energy increasing as you go right on periodic table. Must at least have Na as lowest and Si as highest i + 1 pts totally correct order of ionization enegy (Na < Al < Mg < Si) + 1 pts proper description of why Mg has a higher ionization energy than Al + 0 pts incorrect QUESTION 2 2 Q2 4.5 / 5 + 2 pts understands that atomic radius increases to left and down + 1 pts states that if electron count is equal, more protons contribute to a smaller atomic radius + 2 pts correct order Se > S > Cl > K + 1 pts partially correct in explaining Atomic radius increases to the left and down on the periodic table. + 0 pts incorrect order + 1.5 pts 3 out of 4 correct + 1 pts order half correct + 0.5 pts only one correct QUESTION 3 Q3 10 pts 3.1 0.5 / 0.5 + 0.5 pts 4 + 0 pts Incorrect 3.2 0.5 / 0.5 + 0 pts Incorrect + 0.5 pts 4 3.3 0.5 / 0.5 + 0 pts Incorrect + 0.5 pts 3 3.4 0.5 / 0.5 + 0 pts Incorrect + 0.5 pts 4 3.5 0.5 / 0.5 + 0 pts Incorrect + 0.5 pts sp3 3.6 0.5 / 0.5 + 0 pts Inorrect + 0.5 pts sp3 3.7 0.5 / 0.5 + 0 pts sp2 + 0.5 pts sp2 3.8 0.5 / 0.5
+ 0 pts sp3 + 0.5 pts sp3 3.9 0.5 / 0.5 + 0 pts tetrahedral + 0.5 pts tetrahedral 3.10 0.5 / 0.5 + 0 pts tetrahedral + 0.5 pts tetrahedral 3.11 0.5 / 0.5 + 0 pts trigonal planar + 0.5 pts trigonal planar 3.12 0.5 / 0.5 + 0 pts tetrahedral + 0.5 pts tetrahedral 3.13 0.5 / 0.5 + 0 pts trigonal pyramidal + 0.5 pts trigonal pyramidal 3.14 0.5 / 0.5 + 0 pts tetrahedral + 0.5 pts tetrahedral 3.15 0.5 / 0.5 + 0 pts trigonal planar + 0.5 pts trigonal planar 3.16 0.5 / 0.5 + 0 pts bent + 0.5 pts bent 3.17 0.5 / 0.5 + 0 pts < 109.5 or ~ 109.5 + 0.5 pts < 109.5 or ~ 109.5 3.18 0.5 / 0.5 + 0 pts 109.5 + 0.5 pts 109.5 3.19 0.5 / 0.5 + 0 pts 120 + 0.5 pts 120 3.20 0.5 / 0.5 + 0 pts < 109.5 or ~ 109.5 + 0.5 pts < 109.5 or ~ 109.5 QUESTION 4 4 Q4 6 / 6 + 1 pts Correct CO2 Structure + 1 pts Correct XeF2 Structure + 0.5 pts C=O σ (C sp + O sp2) + 0.5 pts C=O π (C 2p + O 2p) + 0.5 pts CO2 Nonpolar + 0.5 pts XeF2 Nonpolar + 2 pts Correct explanation + 1 pts Partially Correct Explanation + 0 pts Incorrect QUESTION 5 5 Q5 8 / 8 + 4 pts demonstrates that K3PO4 will ionize into 3 equivalents of K+ and 1 equivalent PO4^3- + 4 pts correct calculation for dilution from 1 to 3 liters and calculated concentration of both K and
PO4 + 0 pts incorrect/incomplete + 2 pts correct of concentration of one of either K or PO4 + 3 pts correct calculations but not in Molar form QUESTION 6 6 Q6 8 / 8 + 1 pts **Correct Mole Ratio / Balanced Equation (2 HNO3 + Na2CO3 CO2 + H2O + 2 NaNO3)** + 1 pts **Correct kg-g conversion (or used kmole)** + 2 pts **Correct HNO3 Mole Conversion** + 2 pts **Correct Na2CO3 Conversion** + 1 pts Partially Correct HNO3 Mole Conversion + 1 pts Partially Correct Na2CO3 Mole Conversion + 1 pts On the right track with Mole Conversions + 2 pts **No, there is not enough (LR = Na2CO3)** + 1 pts LR correct OR answered No. + 1 pts On the right track + 0 pts Incorrect QUESTION 7 7 Q7 8 / 8 + 8 pts All Correct + 7 pts Everything's correct except finding the molecular formula + 5 pts Finding correct amount of all elements + 1 pts Finding correct amount of carbon + 1 pts Finding correct amount of hydrogen + 1 pts Finding correct amount of nitrogen + 2 pts Finding correct amount of oxygen + 2 pts nice try + 0 pts $$\space$$ Page 3
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