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When most elastomeric polymers (e.g., a rubber band) are stretched, the molecules become more ordered, as illustrated here: Suppose you stretch a rubber band.
(a) Do you expect the entropy of the system to increase or decrease?
(b) If the rubber band were stretched isothermally, would heat need to be absorbed or emitted to maintain constant temperature?
(c) Try this experiment: Stretch a rubber band and wait a moment. Then place the stretched rubber band on your upper lip, and let it return suddenly to its unstretched state (remember to keep holding on). What do you observe? Are your observations consistent with your answer to part (b)?
Using a Sample of 0.3991 grams of an unknown monoprotic acid, HA, which combines with Sodium hydroxide according to the balanced equation HA + NaOH ® NaA + H2O when 35.30 mL of 0.1086 M Sodium hydroxide is required to titrate the acid to the equiv..
If a precipitation reaction occurs when a solution of one species is added to a solution of the other, enter the formula, including the state, of the insoluble product. If there is no reaction, enter the formula and state of all ions in solution, ..
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