BS 161 Exam Questions With Complete Solutions

BS 161 Exam Questions With Complete Solutions The molecule ethanol has the chemical formula CH3CH2OH. The -CH3 part of the molecule is a methyl group, and has which properties? a.) it is nonpolar since carbon and hydrogen have different electronegativities b.) it is polar since carbon and hydrogen have similar electronegativities c.) it is polar since carbon and hydrogen have different electronegativities d.) it is nonpolar since carbon and hydrogen have similar electronegativities - ANSWER d.) it is nonpolar since carbon and hydrogen have similar electronegativities The molecule ethanol has the chemical formula CH3CH2OH. The -OH part of the molecule is what functional group? a.) methyl b.) sulfhydryl c.) phosphate d.) hydroxyl e.) carboxyl - ANSWER d.) hydroxyl The tendency of nonpolar molecules to self-associate in water rather than dissolve individually is called the: a.) hydrophilic effect. b.) non-polar effect. c.) polar effect. d.) aqueous effect. e.) hydrophobic effect. - ANSWER e.) hydrophobic effect The ability of atoms to attract electrons is referred to as: a.) van der Waals attraction. b.) potential energy. c.) electronegativity. d.) hydrophobicity. e.) cohesion. - ANSWER c.) electronegativity Based on what you know about the relative strength of each type of bond/intermolecular force, which of the following would be LEAST affected by a moderate increase in temperature? a.) hydrophobic b.) ionic c.) hydrogen d.) Van der Waals e.) covalent - ANSWER e.) covalent Which number represents the pH of a solution with the highest concentration of hydrogen ions (H+)? 7.0 11.5 9.1 1.0 4.5 - ANSWER 1.0