M %24 Identify each energy exchange as primarily heat or work, and determine whether the sign of the internal energy, AE, is positive or negative for the system. Note that AU is used as the symbol for internal energy in some sources. An ice chest is filled with ice to cool down drinks. The drinks are the system. O work, positive O heat, positive O heat, negative O work, negative A chair is pushed across a room. The chair is the system. work, negative O work, positive O heat, negative O heat, positive MacBook Pro & %23 7. 5. 4. 3. P. R. K. N B. C. gE command uondo MOSISO B F. %24 D. 36 %23 A chair is pushed across a room. The chair is the system. O work, negative O work, positive O heat, negative O heat, positive A pot of water is warmed by a flame. The water is the sytem. O heat, negative O work, negative O work, positive O heat, positive MacBook Pro Q & %23 $4 9. 7. 4. 5. 3. R. K. H. command MOSISO

▾ Part B Under what conditions will the quantity q be a negative number and the quantity w be a positive number? Oq is negative when the system loses heat to surroundings, w is positive when the surroundings does work on the system. q is negative when the system loses heat to surroundings, w is positive when the system does work on the surroundings. 4 Oq is negative when the system gains heat from surroundings, w is positive when the system does work on the surroundings. Oq is negative when the system gains heat from surroundings, w is positive when the surroundings does work on the system. Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining

Mm12.

Select whether there is no work done by the system, work done by the system or work done by the surroundings for each system described below: A. H20 (1) –→ H,O (g) AH = 44.0 kJ/mol ( Select ] B. 2 NO (g) + O, (g) → 2 NO,(g) AH = -114.1 kJ/mol [ Select ] C. CI (g) + O3 (g) → CIO(g) + O2(g) AH = -163 kJ/mol [ Select ] D. CaCO3 (s) → CaO (s) + CO,(g) AH = 110.1 kJ/mol [Select ] E. 4 NH3(g) + 5 O2{g) → 4 NO (g) + 6 H2O(1) AH = -906 kJ/mol [ Select ] > > >