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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)?
At an altitude of 30 km, the temperature in the stratosphere is approx. -45.3 degrees F. What is the average kinetic energy of a single CF2Cl2 molecule at this temperature?
In the reaction below, 6.15 atm each of H2 and I2 were placed into a 1.00 L flask and allowed to react: H2(g) + I2(g) 2 HI(g) Given that Kc = 45.5, calculate the equilibrium pressure of H2.
The amount of aspiring (molar mass of 180.15 g/mole) in a commercial tabletwas determined by titration with NaOH. What mass of aspiring was in a tablet if 15.00 mL
Two liquids, and , have vapor pressures at a given temperature of 24 and 36 , respectively. We prepare solutions of and at a given temperature and measure the total pressures above the solutions. We obtain the following data
Compute the pH of a buffer solution that contains 0.0020 M carbonic acid and 0.025 M hydrogen carbonate ion. Explain the Ka for carbonic acid is 4.17 x 10(-7).
When the following reaction is balanced in basic solution using the lowest possible whole number coefficients, the coefficient of Pb(OH)42-(aq) will be- BrO3-(aq) + Pb(OH)42-(aq) --> Br-(aq) + PbO2(s)
Explain how you would prepare 500.0mL of a solution that is 0.100M H2SO4 from concentrated 18.0M H2SO4, which is a liquid density 1.82 g/mL.
To produce 856 g of ammonia gas using air as your source of nitrogen gas, what volume of air is required if the air is introduced at 27°C and 760 mmHg. The mole fraction of nitrogen gas in air is 0.781
Calculate the dryness fraction of the steam between the separator and the throttle, and hence the dryness fraction of the steam being bled from the system.
What is n in the Born expression for the non coulomb repulsion energy. What are typical values for n
Calculate the pH at each of the following points in the titration of 50.0 mL of a 0.65 M B(aq) with 0.65 M HCl(aq} (a) before addition of any HCl
Question- A solution with a total pressure of 1 bar, is made up of two compounds A and B. The mole fraction of A in the liquid phase is 0.25 and the mole fraction of A in the vapor phase is 0.15. 1) What are the vapor pressures of pure A and B. Ass..
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