Chem 230 Final Exam| 187 Questions| With Complete Solutions

Many of the properties of water can be accounted for by the fact that correct answer: it is polar Compounds exist as a result of correct answer: chemical reaction In general, chemical bonding brings together elements in the correct ratios so that all of the atoms involved (except H and He) form a/an correct answer: octet What type of bond exists when valence electrons are shared between two atoms? correct answer: covalent bond What type of electron pair is indicated by the arrow in the image of Cl2 correct answer: bonding pair What is the optimal molecular geometry for carbons in saturated alkanes? correct answer: Tetrahedral Rank the bonds below in order of polarity least polar to most polar: C-H C-O O-O O-H correct answer: O-O, C-H, C-O, O-H When the lewis structure is correctly completed, what is the total valence electrons for this molecule? (picture of COOOH lewis dot) correct answer: 24 What is the approximate bond angle around the central carbon atom when the molecule in the previous question is correctly drawn? correct answer: 120 degrees What combination correctly describes a molecule of CO2 in terms of polarity? correct answer: polar bonds, non-polar molecule What combination correctly describes a molecule of NH3 in terms of polarity correct answer: polar bonds, polar molecule What is true about lewis structures correct answer: covalent bonds involve the sharing of electrons, the electrons shared between two atoms are called bonding pairs, only bonding electrons count toward the octet of both atoms, electrons around a single atom are called lone pairs What is special about carbon correct answer: forms 4 covalent bonds, has single, double and triple bonds, bonds to itself forming chains and rings Simple definition of organic chemistry correct answer: the study of carbon-containing compounds and their chemistry What is NOT one of the major subcategories of hydrocarbons correct answer: aldehydes In which of the following categories of hydrocarbons can the number of carbons or hydrogens be correctly calculated using the formula: CnH2n+2 correct answer: alkanes Hydrocarbons contain correct answer: only hydrogen and carbon Fuctionalized hydrocarbons often contain ______ in addition to the answer in the previous question correct answer: oxygen, nitrogen, and sulfur Alkenes contain __________ correct answer: one or more double bonds between carbon atoms best describes an aromatic hydrocarbon correct answer: six-