General Chemistry Questions & Answers

General Chemistry Questions & Answers _________ means the loss of electrons (gain charge) - ANSWER: Oxidation __________ cell involves an electric current used to drive a non- spontaneous rxn. - ANSWER: Electrolytic ___________ means thr gain of electrons ( loss charge) - ANSWER: Reduction A flask contains a mixture of three gases: oxygen, nitrogen, and carbon dioxide. The pressure exerted by N2 is 330 torr, and that exerted by CO2 is 250 torr. If the total pressure of the gases is 725 torr, what is the percent pressure of O2? - ANSWER: The percent pressure of O2 is 20%. The pressure due to the nitrogen and carbon dioxide gases is 330 + 250 = 580 torr. Since the total pressure is 725 torr, the partial pressure of oxygen is the difference: 725 — 580 = 145 torr. Since 145 is 1/5 of 725, the percent pressure of O2 is 1/5 = 20%. A non-spontaneous process is _______ with a ____ G. - ANSWER: Endergonic, positive A spontaneous process is ___________ with _____ G. - ANSWER: Exergonic, negative A substance has a standard heat of formation of 0. This is best explained by the fact that the substance is an element in its_________ ___________. - ANSWER: standard state Acids are proton acceptors and bases are proton donors. true or false - ANSWER: acids are donors bases are acceptors Addition of a catalyst will/not affect the rate of the reaction but not the equilibrium. - ANSWER: will All ionic compounds are_________ electrolytes regardless of how soluble they are. - ANSWER: strong alpha - ANSWER: ____________ decay decrease in the number of neutrons and protons in large nucleus. anion - ANSWER: each electron it gains, acquires a - 1 charge Approximately how many liters would 88 g of dry ice occupy at standard state once it completely converted to its gas form? (R = 0.08 L•atm•K-1•mol-1) - ANSWER: Standard state is 1 atm and 298 K. Carbon dioxide is 44 grams per mole, so 88 grams represents 2 moles. The ideal gas law states that PV = nRT. Substituting all the variables: