Unit 10: Chapter 11.9 [CMY 151] Practice Exam Questions And Accurate Answers.

what is the most important physical property of alkanes and cycloalkanes? (1) - correct answer complete lack of polarity how is a C-H bond classified? (1) - correct answer non polar covalent how does boiling and melting point change with alkanes? (1) - correct answer increasing molecular weight = increasing melting and boiling point which alkanes are gases at room temperature? (1) - correct answer those with 1-4 carbons which alkanes are colourless liquids at room temperature? (1) - correct answer those with 5-17 carbons which alkanes are white, waxy solids at room temperature? (1) - correct answer those with more than 18 carbons what is the relationship between branching and boiling point? (1) - correct answer inverse how is branching inversely proportional to boiling point? (6) - correct answer increased branching = compact molecule = decreased surface area = london dispersion forces over small area = decreased molecular attraction = boiling point decrease why are alkanes not soluble in water? (1) - correct answer they are non polar compounds that cannot form hydrogen bonds with water what are alkanes soluble in? (1) - correct answer non polar organic compounds = what is the density of alkanes in comparison to water? (1) - correct answer alkanes are less dense than water since alkanes are insoluble in water and are also less dense than water, what would happen to an alkane and water? (1) - correct answer alkane floats