General Chemistry Answers

Write a balanced chemical equation for the overall cell reaction represented in the following cell notations:

1. Mg|Mg²⁺||Sc³⁺|Sc
2. Sn|Sn²⁺||Pb²⁺|Pn
3. Pt|Cl^-|Cl₂||NO^-₃|NO|Pt

1.     Distinguish between the following:

a.     Compatible and incompatible elements

b.     Extensive and intensive variables

1.     List 5 reasons Why is it important in geochemistry to understand the atomic properties and geochemical behaviours of elements?                                                                                        

1.     Define the following terms;

a.     Selective condensation

b.     Late heavy bombardment

c.     Differentiation

d.     Atomic mass unit

Electronic configuration         

Freshly cut sodium undergoes a synthesis reaction with oxygen in the air to produce solid sodium oxide. What mass of sodium oxide is produced when 3.45 g of sodium reacts?

From your knowledge of geochemistry, which of the six (6) elements Si, Mg, Al, Fe, K and Ca would you expect to be enriched in

a. the earth's crust

b. the earth's mantle

       Give reasons for your answer.

1. The reaction has a Kc value of 2400 at 2000 K. If 0.850 M each of N2 and O2 are initially present in a 3.00-L vessel, calculate the equilibrium concentrations of NO, N2, and O2.

Naturally occurring oxygen and naturally occurring hydrogen are sparked and the resulting gaseous product are passed through a mass spectrometer.9 peaks of the resulting product were obtained

i.account for the 9 peaks

ii.how could you use the 9 peaks to calculate the relative molecular mass of water