These were the steps taken in a penny experiment. My post lab is asking : 1. to
ID: 990973 • Letter: T
Question
These were the steps taken in a penny experiment. My post lab is asking :
1. to identify if each of these steps resulted in a chemical or physical change.
2. Use chemical equations if possible, if you cannot write a chemical equation, explain why.
Steps of Procedure
Observations
Chemical or Physical Change
Cleaned penny with 20 mL 5% acetic acid and 10 g NaCl
Penny turned into a bright copper color
Placed penny into boiling zinc sulfate solution with solid zing strips
Color of the penny turned to a silver color
Cooled down in DI water
The silver penny became shinier
Placed on hot plate
Penny changed into a shiny gold color.
Can someone help me with writing the equations? unbalanced is ok i am pretty good at balancing.
Thanks.
Steps of Procedure
Observations
Chemical or Physical Change
Cleaned penny with 20 mL 5% acetic acid and 10 g NaCl
Penny turned into a bright copper color
Placed penny into boiling zinc sulfate solution with solid zing strips
Color of the penny turned to a silver color
Cooled down in DI water
The silver penny became shinier
Placed on hot plate
Penny changed into a shiny gold color.
Explanation / Answer
Steps of Procedure
Observations
Chemical or Physical Change
Cleaned penny with 20 mL 5% acetic acid and 10 g NaCl
Penny turned into a bright copper color
Chemical Change:
CuO + 2CH3COOH = Cu(CH3COO)2 + H2O
Patina acetic acid = copper acetate
Placed penny into boiling zinc sulfate solution with solid zing strips
Color of the penny turned to a silver color
physical change(since a layer of zinc is introduced on the penny)
Cooled down in DI water
The silver penny became shinier
Placed on hot plate
Penny changed into a shiny gold color.
Chemical reaction: ZnO is the gold color
Zn + O2 -> ZnO
Steps of Procedure
Observations
Chemical or Physical Change
Cleaned penny with 20 mL 5% acetic acid and 10 g NaCl
Penny turned into a bright copper color
Chemical Change:
CuO + 2CH3COOH = Cu(CH3COO)2 + H2O
Patina acetic acid = copper acetate
Placed penny into boiling zinc sulfate solution with solid zing strips
Color of the penny turned to a silver color
physical change(since a layer of zinc is introduced on the penny)
Cooled down in DI water
The silver penny became shinier
Physical Change (since temperature has just cooled down)Placed on hot plate
Penny changed into a shiny gold color.
Chemical reaction: ZnO is the gold color
Zn + O2 -> ZnO
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.