Chem 1020 Final Exam Questions with 100% Verified Correct Answers what is the most electropositive element? - Correct Answer Li Which of the following elements has 3 electrons in the valence (outer) shell? - Correct Answer B Which of the following would you expect to have ionic bonds? - Correct Answer CsF Which of the following would you expect to have polar covalent bonds? - Correct Answer NF3 Which molecule has nonpolar covalent bonds? - Correct Answer N2 the number of electrons in the valence shell of sulfur is? - Correct Answer 6 oxygen is more electronegative than - Correct Answer sulfur the most electronegative elements in the periodic table are generally found - Correct Answer toward the right in a horizontal row and toward the top in a column for carbon monoxide, O has a formal charge of - Correct Answer +1 what is the formal charge of N in HNO3? - Correct Answer +1 what is the percent s character in an sp2 hybridized orbital? - Correct Answer 33% 1 / 3
the maximum number of electrons that a molecular orbital can contain is - Correct Answer 2 the approximate H-C-H bond able in methane is - Correct Answer 109.5 the lewis structure of methane (sp3) - Correct Answer tetrahedral acyclic - Correct Answer containing no rings of atoms heterocyclic - Correct Answer ring shaped carbon chain which has to have at least one atom that isn't carbon in the ring what is the name of the alkane that has 3 carbon atoms? - Correct Answer propane which of the following would exhibit hydrogen bonding? - Correct Answer CH3OH the more carbons - Correct Answer the higher the boiling point the boiling points of normal alkanes - Correct Answer rise as the length of the carbon chain increases and are higher than the boiling points of branched alkanes with the same molecular formula the most stable conformation of propane is - Correct Answer staggered the least stable conformation of propane is - Correct Answer eclipsed what is the C-C-C bond angle of cyclobutane? - Correct Answer 90 degrees benzonitrile - Correct Answer benzene with a 3 (-) N 2 / 3
What class of organic compounds result when cyclopentanone reacts with ethylamine in the presence of trace acid? - Correct Answer Imine what product results from the SN2 reaction between R-2-chloropentane and hydroxide? - Correct Answer S-2-pentanol in nucleophilic acyl substitution - Correct Answer addition to the carbonyl by a nucleophile is followed by loss of the leaving group.sn2 reactions usually proceed with - Correct Answer complete inversion at the center undergoing substitution predict the two most likely mechanisms for the reaction of 2-iodohexane with sodium ethoxide - Correct Answer SN2 & E2 predict the two most likely mechanisms which occur when 2-iodohexane is heated in ethanol - Correct Answer E1 and SN1 acetyl chloride undergoes nucleophilic substitution at a faster rate than methyl acetate because - Correct Answer chloride is a better leaving group than methoxide Esters and amides are most easily made by nucleophilic acyl substitution reactions on ________. - Correct Answer acid chlorides which reagent could be used in a williamson synthesis of cyclohexyl methyl ether? - Correct Answer NaH an amie can react with an acid anhydride to form an amide. the process is known as - Correct Answer nucleophilic acyl substitution anisole - Correct Answer methoxybenzene
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