Consider the molecule shown below. One part of the molecule is missing (shown as a question mark). Options A through E shown some chemical groups that could be added in the question mark position. ΗΗ H-C-C-O-? HH Which of the options below will NOT fully satisfy the bonding requirements for the atoms in the molecule? A H B CH3 C OH D CH₂ E COOH

< : ed Lewis structure N 0_C_0: H = Br O: the proposed Lewis str Yes. No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are: * Yes. No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:* Yes. No, it has the wrong number of valence electrons. The correct number is: No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are:*

Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. substance A B C D H chemical symbol, chemical formula or Lewis structure H | HC H | N H- HIC - C C - H Η H HIC C I | H H — — - H Cr O-H Ar :O: O HIC - H C H - H - X boiling point (Choose one) ◊ (Choose one) (Choose one) (Choose one) ✪ S

Calculate the enthalpy change for the reaction shown below between ammonia and phosgene to produce urea and HCI. Use the bond-dissociation energies listed in the table. Bond H-CI H-N C-CI C-N CI + 2 NH3 AHBDE (kJ/mol) 432 339 397 748 AHrxn = +444 kJ/mol AHrxn= -888 kJ/mol AHrxn= -444 kJ/mol AHrxn= +888 kJ/mol .C. HẠN-“NH, * 2 H-CI

Lewis Structure of Elements Draw the Lewis structure of elements and determine the number of electrons gained or lost by an element in an ion formation. Lewis Structure Element Compound Formula Compound Formation + [K] [:Br:] KBr Potassium and Bromine K. + ·Br: K. Br: Potassium Bromide Calcium and Nitrogen Lithium and 0xygen Sodium and Phosphorous Aluminum and Sulfur

Consider the phosgene (COC1₂) molecule. What is the central atom? Enter its chemical symbol. How many lone pairs are around the central atom? What is the ideal angle between the carbon-chlorine bonds? Compared to the ideal angle, you would expect the actual angle between the carbon-chlorine bonds to be... 0 口。 (choose one) (choose one) about the same bigger smaller

Please count total number of valence electrons, have lewis structures, resonance structures where applicable, and name the molecular geometry for each central atom.

Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. substance A B C D chemical symbol, chemical formula or Lewis structure H : Cl H Nb Cl5 - N | H : Cl: C : Cl: -D - H · Η Cl I C-H I H boiling point ✓ (Choose one) | (highest) 2 3 4 (lowest) (Choose one) (Choose one) ✓

Draw the Lewis symbols for each of the following elements, both before reaction and after reaction to obtain a complete shell: Before reaction. After reaction. P Br Be

Consider the bromate (BrO3) anion. What is the central atom? Enter its chemical symbol. How many lone pairs are around the central atom? What is the ideal angle between the bromine-oxygen bonds? Compared to the ideal angle, you would expect the actual angle between the bromine-oxygen bonds to be ... 口。 (choose one) X