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Which of the following statements is correct? If a reaction occurs at constant temperature, AE = 0. If a reaction occurs at constant pressure, w = AE. O if a reaction occurs at constant volume, q = AE. If a reaction occurs at constant pressure, q = AE. o fa reaction occurs at constant volume, q = W. Calculate AE of a gas for a process in which the gas evolves 27) of heat and does 24 ) of work on the surroundings. Answer in J and be careful of signs. and AH has a sign. When a combustion (burning of a substance) occurs, the resulting process is O endothermic / positive exothermic / positive exothermic / negative endothermic / negative What is the value of AH if the following reaction is multiplied throughout by 2? 2CH3OH (0) + 302 (g) 4H20 (0 + 2002 () AH = -1,452.8 kJ/mol Answer in kl. What is the value of AH if the following reaction is reversed? 2CH3OH (0+302 (9) 4H20 (0 + 2002 (3) AH = -1,452.8 kJ/mol Answer in kl. Calculate the amount of heat absorbed by the surroundings when 183 g of mercury cools from 87C to 22C. The specific heat capacity of mercury is 0.14 1/80). Report your answer in kj kilojoules) to 3 significant figures. A 15.2 g piece of gold is heated from 22.5C to 96.3C. calculate the heat absorbed (in kJ) by the metal. The specific heat capacity of gold is 0.129K), Report your answer to 3 significant figures. Suppose you have equal masses of two metals A and B with a low and a high specifc heat respectively, if both metals start at the same temperature and are given the same heat which of the two metals will end up at a lower temperature after the addition of heat? B Cannot tell by the information provided It depends on the starting temperature Consider the following table: METAL Aluminum (Al) Copper (Cu) Mass (g) 20 60 Specific Heat (1/(g:C) 0.897 0.385 Temperature (C) 40 70 If you place these two metals in contact, which of the following will happen? O Heat will flow from Al to Cu because Al has a larger specific heat O Heat will flow from Cu to Al because Cu has a larger mass O Heat will flow from Cu to Al because Cu is at a higher temperature O None of the above