General Chemistry Answers

A sample of 0.623 mol of methane has a volume of 5.0 L at 25 oC. Calculate the pressure of the gas.

A sample of 0.623 mol of methane has a volume of 5.0 L at 25 oC. Calculate the pressure of the gas.

Calculate the freezing point and boiling point in each solution,

assuming complete dissociation of the solute.

a. 10.5 g FeCl3 in 1.50 * 102 g water

Explain if this is true or not (provide examples).  A double or triple bond acts as a single bond when determining molecule shape. 

A hypothetical molecule with the formula XY3 is discovered, through experiment, to exist.  It is polar.  Which molecular shapes are possible for this molecule?  Which shapes are impossible?  Explain why in each case.

List five (5) periodic properties of elements and explain their trend on the periodic table.     

1. Why does the 4s orbital get filled with electrons before any electrons can be placed into a 3d orbital? 

1.     State the Goldschmidt’s rules 3 of substitution and explain the characteristics of the elements that allow for following behaviors:

a.     Ni substitutes for fe²⁺ and Mg in olivine

b.     Cr and V substitutes for Fe³⁺ in spinel

c.     Sr substitutes for Ca in plagioclase

d.     Rb substitutes for K in alkali feldspar and biotite

Question 2 A sample of 6.2 g of copper (II) carbonate is heated until a constant mass is obtained. Calculate the mass of copper(II) oxide that will be formed from 6.2 g of copper(II) carbonate. (Relative atomic mass of C:12, 0:16, Cu: 64) (10 marks]