Question

1-When pressing a piston against argon gas inside a cylinder where the cylinder is in contact with air, (i)In terms of “System” & “Surrounding”, I would say the system is _____________________, while the surrounding is ______________________? (ii)(a)Would you consider the above action “work done by the system” or “work done on the system”? (b)Would you give this work w a +ve sign or -ve sign?____________________________________. (c)What equation you would use to express the work w done?_______________________________. (iii)Would the gas heat up or cool down? _____________________________________________ . (iv)(a)Use an arrow & simple sketch to indicate the flow of heat q? (b)Would you give heat q a +ve sign or -ve sign?____________________________________. 2-(i)In a chemical reaction if the net change in amount is +Δn ∴ work done is: w = ________________________________________? (ii)(a) For an isothermal-reversible process work is expressed in terms of volume as: _______________________________? (b)Isothermal means: _____________________________________________________________, while an isotherm means: __________________________________________________________? This implies that an isobar means:__________________________________________________________? 3-(i)We measure heat q using an instrument called ________________________________? (ii)This instrument has heat capacity C and measures ΔT , hence we can determine Enthalpy change of a reaction ΔHr using the equation: ____________________________________? (iii)The difference between specific heat capacity Cg & molar heat capacity Cm is that the former contains the unit __________ while the latter contains the unit __________ ? However, both are considered ___________________________ property. (iv)The difference between molar heat capacity Cv,m & Cp,m is that the former expresses conditions at ________________________ while the latter conditions at ______________________________. Should note that Cv,m is __________(> or <) Cp,m & related by the equation:________________________. 4-The law that allows determination of enthalpy of reaction ΔHr from Cp,m values is: ______________________________ defined as: ΔHr (Tr) = _______________________________________________?

Answer 1