Purpose: To decompose an oxide of copper into pure

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Title of Lab
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Data Table:
 Remove this text box by clicking on the border, then
mass of black powder given (g)
hitting “delete.”
mass of test tube and black powder BEFORE heating (g)
#### g
mass of test tube and new color powder AFTER heating (g)
#### g
description of powder in test tube AFTER heating
2.0 g
type color here
mass of oxygen “lost” (g)
#### g
mass of copper remaining (g)
#### g
% oxygen
#### % O
% copper
#### % Cu
empirical formula
type formula here
name of empirical formula
copper (?) oxide
Calculations: ideal data:
copper (I) oxide = type formula here
copper (II) oxide = type formula here
Cu = # (63.55) = #####
O = # (16.00) = #####
##### g/mol
Cu = # (63.55) = #####
O = # (16.00) = #####
##### g/mol
Cu = ###### = ##### % Cu
######
Cu = ###### = ##### % Cu
######
O = ###### = ##### % O
######
O = ###### = ##### % O
######
Calculations: experimental data:
Experimental Percent Composition:
Experimental Empirical Formula:
### g Cu = ##### % Cu 
2.0 g total
##### g Cu
1 mol Cu = ###### mol Cu = # mol Cu
63.55 g Cu ######

##### g O
### g O = ##### % O
2.0 g total
1 mol O
16.00 g O
= ###### mol O = # mol O
######
Difference between the Experimental Percent Composition and the Ideal Percent Compositions:
#####% Cu in copper (I) oxide
– #####% Cu experimentally
#####% difference
#####% Cu in copper (II) oxide
– #####% Cu experimentally
#####% difference
Graphs:
KEY
 = Cu
=O
Ideal copper (I) oxide
Experimental copper (?) oxide
Ideal copper (II) oxide
Conclusion: The compound that was decomposed in the test tube was type the formula,
copper (?) oxide, because the percentages calculated from the actual data more closely
match the ideal percentages of type the formula (a difference of ##### %) than they do the
ideal percentages of type the OTHER formula (a difference of ##### %).
Questions:
1. Type in your answer to question #1 here (use full sentences—incorporate the question into
your answer).
2. Type in your answer to question #2 here (use full sentences—incorporate the question into
your answer).
3. Continue typing in full sentence answers to ALL questions.
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