17. An exothermic reaction causes the surroundings to (A)warm up (B) become acidic (C) expand (D) decrease its temperature

24. Which of the following processes always results in an increase in the energy of a system? (A) The system loses heat and does work on the surroundings. (B) The system gains heat and does work on the surroundings (C) The system loses heat and has work done on it by the surroundings. (D) The system gains heat and has work done on it by the surroundings.