Physical Chemistry Answers

Question 1 : The zeroth law of thermodynamics is based on the concept of
entropy
Conservation of energy
absolute zero temperature
thermodynamic equivalence
Question 2 : Which of these does not depict thermodynamics?
Rate of reaction
Performance of car engine
Melting of ice
Boiling water for coffee
Question 3 : Which of these is not an extensive property of a system?
Mass
Energy
Density
Volume
Question 4 : Which of the following statements about enthalpy is incorrect?

Δ
H
ΔH is the enthalpy change at constant pressure
Reactions which absorb heat have a positive DH
Enthalpy and internal energy of a system are always identical
enthalpy is a state function
Question 5 : The first law of thermodynamics deals with
conservation of energy
entropy
thermodynamic equivalence
absolute zero temperature.

Using the Brønsted-Lowry definition of acids and bases, identify each reactant in the reactions below as an acid or base. Explain how you determined your answers in detail.
H3O+ + Cl- → H2O + HCl
H2PO4- + H2O → H3O+ + HPO42-
HSO4- + H2O → OH- + H2SO4
O2- + H2O → OH- + OH-

The ideal gas law predicts that the molar volume (volume of one mole) of gas equals:
(a) gRT/PV
(b) (MW)P/RT
(c) 1/2ms-2
(d) RT/P
(e) 22.4 L at any temperature and pressure

What factors influence the Rate of a Reaction?
What is an Exothermic Reaction? What is an Endothermic Reaction?

1. State the oxidation state of the central atom in the following species:
(a) SiBr4
(b) Cr(NH3)6Cl3
(c) NO3-
(d) PO4^3-

2. Balance the following oxidation-reduction reaction in acidic solution:
MnO4

MnO4- + C2O42- >>>>>>> Mn2+ + CO2

3. In general, analogous bonds weaken down a periodic group, whereas for
dihalogen molecules, X2 we find the following bond strengths:

F-F 158; Cl-Cl 242; Br-Br 193; I-I 151 kJ mol-1

4. Draw all possible isomers of:
(a) [Co(NH3)3Cl3]

(b) [Ni(PMe3)(PEt3)Cl2]

6. Draw the most stable conformation for cis-1-bromo-3-(tert-butyl)cyclohexane.
Justify your answer.

If a water electrolysis cell operates at a current of 8.2 A , how long will it take to generate 27.0 L of hydrogen gas at a pressure of 25.0 atm and a temperature of 24 ∘C?

a container with 24litres of nitrogen at 2 atm and another container with 12litre of oxygen gas at 2atm the temprature of the both gases is 273.15k. if the both gases are mixed in 10litre container what ar the partial pressure of nitrogen and oxygen in the resulting mixture

explain important feature of crystal structure of sodium chloride