Name: _________________________________
A__: Tue, Dec 8
B__: Mon, Dec 7
#28 Cu Retrieval Lab – Part I
Mr. Wegert – Chemistry
Do Now: Read passage and clues, find word, do crossword, write words next to clues, turn over sheet
Passage #28:
Students were trying to recreate Mendeleev’s prediction of the existence of a metalloid called
Germanium. They collected data about elements based on atomic mass. They summarized the results.
Table 1: looked at the # of metals and metalloids based on atomic mass, and how many were metalloids.
% of elements that are
Atomic Mass (g/mol)
# metals and metalloids
# of metalloids
metalloids
< 50
11
2
18
50-200
52
4
8
>200
30
1
3
Table 2: tried to pinpoint which specific atomic mass ranges had the most metalloids, like Germanium.
% of elements that are
Atomic Mass (g/mol)
# metals and metalloids
# of metalloids
metalloids
50 - 100
18
2
11
100 - 150
16
2
13
150 - 200
18
0
0
1. What is the independent variable that was
manipulated in Table 1 and Table 2?
2. What were the dependent variables
watched and measured in both tables?
3. What was calculated in both Table 1 and
Table 2?
4. Where specifically did the data in Table 2
come from?
5. What is the atomic mass of the metalloid
whose existence Mendeleev predicted?
CRS Clicker & CER Practice
Q# Claim Evidence (what you see)
#28 Cu Retrieval Lab – Part I
Reasoning (what you think about what your see)
Purpose:_________________________________________________________________________
_________________________________________________________________________________
Procedure Checklist (in pairs):
Data Table: Copper Retrieval Lab – Part I (mass in grams, g)
1. Mass of CuO + cup =
2. Mass of empty cup =
3. Calculate Mass of CuO =
4. Mass of large filter paper =
5. Mass of small filter paper =
Homework Scratch Area:
Labs
Copper Lab
Unbalanced Reaction
Cu + O2  CuO
Cu Retrieval Lab – Part I
CuO + HCl → CuCl2 + H2O
Cu Retrieval Lab – Part II
CuCl2 + Zn → Cu + ZnCl
Homework: Complete worksheet table above
#28 Cu Retrieval Lab – Part I
Balanced Reaction
____/10 pts