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A copper penny builds up a layer of corrosion on its outsides. Probably copper oxide. The cleaning just dissolves the outer corrosion and leaves a new outer layer of copper. CuO + HNO3 --> Cu(NO3)2 + H2O ... the copper nitrate is dissolved in the acid solution and leaves 'clean' copper behind.
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Is cleaning a penny with vinegar and salt a physical or chemical change?
Cleaning a penny with vinegar and salt is a chemical change. The vinegar (acetic acid) reacts with the salt (sodium chloride) to form a chemical compound that removes the tarnish on the copper surface of the penny. This reaction changes the composition of the penny's surface, making it appear shiny and clean.
Is cleaning a chemical reaction?
Cleaning involve chemical reactions but cleaning is possible also by dissolution of contaminants - a physical process.
Is cleaning a penny a chemical change or a physical change?
this is my homework just give the answer already!
Is cleaning a sink with Drano a chemical reaction?
Yes, cleaning a sink with Drano involves a chemical reaction. Drano contains chemicals that react with the clogs in the sink, breaking them down into smaller, soluble particles that can be washed away with water. This reaction helps to clear the blockage in the sink.
How is putting ketchup on a penny a chemical reaction?
it's not. tell whoever told you that to go back to pre-school.
