Physical Chemistry Answers

What causes imprecision in GC?

a. Wrong choice of injection type

b. Using long tubing

c. Applying liquid stationary phase

d. Using carrier gas

e. Applying temperature programing

What are the applications of molecular emission spectroscopy?

1. Fluorescent active drugs
2. Fluorescent active impurities
3. Drug protein binding

a. I and III

b. Only I

c. Only II

d. I, II and III

e. I and II

Which one of the following energy levels are occupied upon absorption of UV-Vis energy?

1. Excited V0

2. Excited V1

3. Ground state V2

A) 1 and 3

B) 1 and 2

C) only 2

D) 2 and 3

E) 1,2 and 3

Assume water boils at 100^oC in Houston (near sea level), and at 90^oC in Cripple   Creek, Colorado (near 9500 ft ). If it takes 4.8 min to cook an egg in Cripple Creek and 4.5 min in Houston, what is Ea for this process? 

The following figure represents a complete cycle for one mole (n = 1) of an ideal monatomic gas Use the first law of thermodynamics to not find the vacant values ​​in the two tables (assume that all the steps are in reverse)...

Status: 1

pressure: unknown

Size: 22.4

Temperature: 273

Status: 2

pressure: unknown

Size: 22.4

Temperature: 546

Status: 3

pressure: unknown

Size: 44.8

Temperature: 546

Derive the vander wall equation of state for real gas .

Calculate the mass of the solute in 0.1 L of a 5.04x103 M cholesterol solution (C27H460

A saturated liquid ethyl acetate compressed from 400kPa to 1000Kpa at 300K. Calculate

the change in enthalpy and entropy during this compression process.

For Saturated liquid ethyl acetate at 300K; VL = 2×10-3 m3

/kg and β = 3 × 10-3 K-1

Radioactive elements such as radon (Radon 222), thoron (Radon 220) and their by-products

formed by the decay of radium (Radium 226) and thorium present in many sorts of rocks,

other building materials and in the soil. Prove that product formed by these elements follow

λt = ln (No/N) equation and their half-life independent of concentration.

26 Real solutions deviate from the ideal solutions due to:

(A) Solute-solvent molecules interactions are equal.

(B) Vapor pressure of the solvent is more than the vapor pressure of the solute

(C) Vapor pressure of the solvent is less than the vapor pressure of the solute.

(D)The solute is completely soluble in the solvent.