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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?
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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.
Is cleaning silver an endothermic or exothermic reaction?
Cleaning silver typically involves a chemical reaction that can be classified as endothermic. For example, when using silver polish or a chemical solution like baking soda and aluminum foil in warm water, the reaction absorbs heat from the surroundings, resulting in a drop in temperature. Thus, the process of cleaning silver requires energy input, making it endothermic.
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 turning a penny gold a chemical or physical reaction?
Turning a penny gold is a physical reaction rather than a chemical reaction. This process involves coating the penny with a layer of gold, which changes its appearance but does not alter the chemical composition of the penny itself.
Is a rusty penny an example of a chemical reaction true or false?
Yes. The rust on the penny indicates that a reaction between the penny and its environment has occurred. Since a new material was formed from this reaction (the rust) the reaction must be a chemical reaction.
Is dissolution of a copper penny in nitric acid a chemical reaction?
Yes. Dissolution of a copper penny would indeed be a chemical reaction.
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?
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Is putting a penny in lemon juice a physical or chemical change?
Putting a penny in lemon juice would cause a chemical change because the lemon juice reacts with the copper in the penny to create copper oxide, which changes the chemical composition of the penny.
What is the ideal ratio of vinegar to baking soda for creating a chemical reaction in a homemade cleaning solution?
The ideal ratio of vinegar to baking soda for creating a chemical reaction in a homemade cleaning solution is 1:1.
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.
Is salt and vinegar removing tarnish from a penny physical or a chemical change?
Removing tarnish from a penny with salt and vinegar is a chemical change. The reaction between the salt, vinegar, and tarnish on the penny results in the formation of new substances that remove the tarnish.
How cleaning copper tarnish off a penny relates to chemistry?
Tarnish can be removed from a penny by physical means; however, this tends to damage the coin and would not be an acceptable way of handling antique or valuable items. Tarnish itself consists of a number of copper compounds formed from elements and compounds that copper items come into contact with, even those that exposed only to the atmosphere. Some knowledge of chemistry is important to knowing what these compounds are, and how they might be removed, without damage being done to coins in the process.
What chemical process involve in cleaning?
Cleaning is a reaction between soaps (and other detergents) with dirt, followed by dissolution and releasing of the formed compounds.
