CEM 142 MSU Final Exam Questions and Answers Already Passed

CEM 142 MSU Final Exam Questions and Answers Already Passed Does aqueous sugar conduct electricity, why or why not No, because there are no ions Does aqueous NaCl conduct electricity? Yes, because this is an ionic compound (metal/nonmetal) What is the only IMF present in non polar molecules London Dispersion Forces How does electronegativity change in the periodic table Electronegativity increases from left to right (with the right being most electronegative), and increases from bottom to top (with top most electronegative) What is present in ALL molecules LDFs What is Coulombs Law unlike charges attract and like charges repel What is an LDF temporary fluctuating dipoles What is the sign of an exothermic reaction negative Dipole dipole interactions are present... only in polar substances What is the sign of an endothermic reaction positive Explain hydrogen bonding and it's rules Present between 2 molecules: - the first must contain H covalently bonded to O, N, or F - the second must have O, N, or F with a lone pair Are bonds formed or broken during exothermic reactions formed If a hydrogen bond is present... then so are LDFs and dipole dipole interactions Is energy released or absorbed during exothermic reactions released How do you know which molecules has a higher boiling point when comparing 2 molecules the molecule with stronger IMFs takes more force (energy) to break so it has a higher boiling point Are bonds formed or broken in endothermic reactions broken The attraction between charges particles is caused by... electronegativity Is energy released or absorbed during endothermic reactions absorbed Does temperature increase or decrease during exothermic reactions increase (heat goes out of the system and the surroundings get hotter) Does temperature increase or decrease during endothermic reactions decrease (heat goes into the system and the surroundings get colder) When are IMFs present in water solid and liquid phase What is the first law of thermodynamics? Energy cannot be created or destroyed What is a state function depends only on the initial and final states, does not depends on the path taken ex: the elevation of a camp site on a mountain is a state function because it is independent of that path taken to reach it