Introduction to physical chemistry questions.

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#	Question
1	Mg metal is easily deformed by an applied force, whereas MgF₂ is shattered. Why do these solids behave so differently? Short answers
2	Which gives a more concentrated solution; $KNO_{3}$ in water or $KNO_{3}$ in $CCl_{4}$ ? Explain. Short answers
3	Why is moist air less dense than dry air? Short answers
4	A solution contains 20.0 mg insulin in 5.00 l develops an osmotic pressure of 12.5 mm Hg at 300 K. Determine the molar mass of insulin. Mathematical Calculation
5	What is rms speed of $O_{2}$ molecule at STP? Short answers
6	When 0.6 L Ar at 1.2 atm and 227°C is mixed with 0.2 L $O_{2}$ at 501 torr and 127°C in a 400 mL flask at 27°C, what is the pressure in the flask? Mathematical Calculation
7	Benzoyl peroxide, the substance most widely used against acne, has a half life of $9.8 imes 10^{3}$ days when refrigerated. How long will it take to lose 5% of its potency? Mathematical Calculation
8	Derive the rate law that is consistent with the proposed mechanism in the formation of phosgene from $Cl_{2}$ and $CO$ . ( $K_{1}=frac{k_{1}}{k_{-1}}$ and $K_{2}=frac{k_{2}}{k_{-2}}$ may be considered as equilibrium constants of the elementary processes and M is any inert molecule) $Cl_{2}+M ightleftharpoons 2Cl+M$ (fast equilibrium, $K_{1}$ ) $Cl+CO+M ightleftharpoons ClCO+M$ (fast equilibrium, $K_{2}$ ) $ClCO+Cl_{2} ightarrow Cl_{2}CO+Cl$ (Slow, $K_{3}$ ) Mathematical Calculation
9	A voltaic cell consists of a standard $H_{2}$ electrode and a $Cu/Cu^{2+}$ electrode. Calculate [ $Cu^{2+}$ ] when $E_{cell}$ is 0.25 V. Given $Cu^{2+}/Cu=0.34V$ . Mathematical Calculation