Physical Chemistry Answers

A certain natural decay series stars with ₉₂²³⁸U and ends with ₈₂²⁰⁴Pb. Each step involves the loss of either an α-particle or a β-particle. What is the number of α-particles released?

What is the number of β-particles released?

How did we attain the second electron of affinity

The rate determining step of a reaction that governs the experiment is given by the equation S2O82-(aq) + 3I-(aq) → SO42-(aq) + I3-(aq). If the rate constant of the reaction at 200C and 600C is exactly nx10-5s-1 where n is the order of the reaction respectively. Find the activation energy?

Which of the following pairs of quantum numbers is not possible (impossible)

A. 1,2,3,-1/2

B. 2,1,0,1/2

C.1, 0, 0, -1/2

D. 5,4,0,+-1/2

E.3,1,0,+1/2

In a certain reaction, 3.45g of Sodium reacted with 5.43g of Chlorine. What is the mass of the product formed in mg

A. 3.45 x 10-3 mg

B. 5.43 x 10-4 mg

C. 5.345 x 10-5 mg

D. 3.4 x 10-2 mg

What is the number of atoms of hydrogen in n moles of methane where n is the total order of the reaction. S2O82-(aq) + 3I-(aq) → SO42-(aq) + I3-(aq).such that this step is called the rate determining step of the reaction (NA represents the Avogadro constant).

A. 1/4(NA) B. 1/3(NA) C. (NA) D. 1/2(NA/4) E. NA/16

A radioactive decay involves the emission of n aplha particles and m beta particles. Given that the decay process involves the reaction 714N → n24He +m0-1β + n1n2X. Given that the values of n1,n2 , n and m are calculated theoretically such that n1 - m(d/dy (1/y)) = 7 where y=-1.

A. n2 = 14-n

B. n1 = 7

C. n2 =14-3n

D. m=2n

E. n1 = 7-2m + n

Arrange the following in order of increasing stength :

1) Trichloromethanoic acid 2) Ethanoic acid 3) Dichloroethanoic acid 4) Chloroethanoic acid

A. 2,4,3,1

B. 1,2,3,4

C. 1,3,4,2,

D.4,3,2,1

E.4,3,1,2

The molecular orbital theory is used to deduce the magnetic properties of an atom, an iron or a molecule. According to this theory

A. Oxygen atom is para-magnetic

B. Oxygen molecule is diamagnetic

C.Nitrogen is both para and diamagnetic

D. CO2 is para-diamagnetic gas.