CHEM 219 Module 1 Problem Set Exam Questions With 100% Correct Answers | Updated 2026 | Graded A+

CHEM 219 Module 1 Problem Set Exam Questions With 100% Correct Answers | Updated 2026 | Graded A+ On a piece of scratch paper, write out the Lewis Dot Diagram for each of the indicated elements and determine the following for each: a) The number of Lone Pairs the atom possesses in its valence shell. b) The number of Unpaired Electrons the atom possesses in its valence shell. c) The number of bonds the atom will form. Oxygen Carbon Hydrogen Nitrogen - answer-Oxygen - a) 2 b) 2 c) 2 Carbon - a) 0 b) 4 c) 4 Hydrogen- a) 0 b) 1 c) 1 Nitrogen - a) 1 b) 3 c) 3 Classify the bonding between the given pairs of atoms as ionic, covalent, or polar covalent. Use the table of electronegativities shown below to help with the classification. a. Br and Br b. K and Cl c. P and Cl d. C and O e. Na and Br - answer-a. Br-Br: Electronegativity difference () = 0 = COVALENT (or pure covalent) b. K-Cl: () = 2.2 = IONIC c. P-Cl: ()= 0.9 = POLAR COVALENT d. C-O: ()= 1.0 = POLAR COVALENTe. Na-Br: () = 1.8 = POLAR COVALENT Define the term constitutional isomer. - answer-Two (or more) different chemical compounds with the same molecular formula but different connectivity between the atoms in their structural formulae. Explain (using specific evidence) what makes the following two compounds constitutional isomers of one another: - answer-Both compounds have a MF of C3H6O - same MF. Compound "a" has a 3-carbon chain with a C=O in the middle. No H atom connected to C of C=O. Compound "b" has a 3-carbon chain with a C=O at the end. There is an H attached to the C of the C=O. What is the relationship between the compounds shown? Are they the same compound, constitutional isomers, or two different compounds that are not related to one another? Explain. - answer-Different compounds that are not related. They have different MF - (a) C3H8O, (b) C3H6O. Identify each of the following carbon skeletons as linear (continuous), branched, or cyclic. - answer-a) Branched b) Linear (continuous) c) Cyclic On a piece of scratch paper, write out structural formulae for all of the constitutional isomers possible for the MF C3H6F2. How many isomers are possible for this formula? - answer-FOUR (shown below) Characterize each of the following structural formula representations as either a dash, condensed, super-condensed, or bond-line formula: - answer-a) Super-Condensed b) Condensed c) Bond-line d) Dash Write the molecular formula for each of the compounds whose bond-line formulae are given below. - answer-a) C5H10 b) C3H8O c) C4H10O