chemistry portfolio qtr 2

I. Title: The mole concept II. Purpose: To identify the identity of each sample based on observation and

numerical data III. Materials: 1) mole sample set; 2) balance IV. Procedure: 1) First you look at each different bar and you make observations such as color,

length, and relative weight 2) Then you find the actual mass on the balance 3) Then you identify the identity of the atom by using the number of atoms 4) Answer analysis and conclusion questions V. Data (PART A)

Sample Observations A Heavy; silver; second longest of the four B Lightest one; silver; shiny; longest one C 2nd shortest; 2nd heaviest D Copper color; heaviest; shortest

Sample Mass (g) # of moles # of atoms Identity of

Atom A 65.2 1 mol 6.022 x 10 ^23 Zn B 27 1 mol 6.022 x 10 ^ 23 Al C 55 1 mol 6.022 x 10 ^ 23 Fe D 63.5 1 mol 6.022 x 10 ^23 Cu

VI. Analysis And Conclusion 1) Question: What lead to the determination of each element? Answer: The average

atomic mass 2) If the elements were exactly one mole, why were the masses different? Answer:

Because the atoms have different masses 3) Determine the actual mass of a single atom of each sample (mass of sample in

grams divided by avogadros constant) Answer : (a) 1.08 x 10 ^ -22 ; (b) 4.5 x 10 ^ 23 ; (c) 9.1 x 10 ^ 23 (d) 1.05 x 10 ^ 24