Physical Chemistry Answers

Balance the following equations using the change in oxidation number method.

3.NH3+O2⎯→NO+H2O

Balanced equation: _______________________________________________________

Oxidant:

(1 pt) ________________

Reductant:

(1 pt) ________________

Balance the following equations using the change in oxidation number method.

2.Cl2+ I2+ H2O⎯→HIO3 + HCl

Balanced equation: _______________________________________________________

Oxidizing agent:

(1 pt) ____________________

Reducing agent:

(1 pt ) ____________________

Balance the following equations using the change in oxidation number method.

(10 pts each)

1.

Fe

+

HNO3

⎯→

NO + Fe2O3

+ H2O

Balanced equation: _______________________________________________________

Substance oxidized:

(1 pt) ___________________

Substance reduced:

(1 pt) ___________________

Atomic weight; Berat atom; Fe =56, Cl= 35.5, 0 = 16, H=l, S=32 C=l2, Na=23, Ca=40, Si=28, P=3 l]g/mol 

Identify the molar mass.

FeCb

H2SO4

Arrange the following in order of increasing boiling point: RbF, CO2, CH3OH, CH3Br. Explain your

reasoning

Ammonia is both a donor and an acceptor of hydrogen in hydrogen-bond formation. Draw a diagram

showing the hydrogen bonding of an ammonia molecule with two other ammonia molecules. (5 point

) The solubility product of PbBr2 is 8.9 x 10-6 . Determine the molar solubility, i) in pure water, and, ii) in 0.20 M Pb(NO3)2 solution.

To 5.0 L ideal gas, 1.0 kJ of heat is added. The gas expands against a constant external pressure of 1.0 bar to a final volume of 8.0 L. What is the change internal energy for the gas (1.0 L.bar = 0.10 kJ) 

A.

0.30 kJ

B.

0.70 kJ

C.

1.3 kJ

D.

1.8 kJ

Automotive air bags inflate when a sample of sodium azide, NaN , is very rapidly decomposed.

What mass of sodium azide is required to produce 2.6 ft (73.6 L) of nitrogen gas with a density of 1.25 g/L?

 What are the factors that influence chemical equilibrium? Explain with 5

suitable examples the principle of Le Chatelier.