What caused the color change observed in penny 2?
Was it a chemical or physical change? The zinc (which was already silver) coated the penny. The NaOH dissolved the zinc. (that was what made the water murky) And small pieces of zinc adhered to the penny (coated) It was a physical change because no NEW color was created.
What caused the penny to turn silver?
When a copper penny is heated in a solution of sodium hydroxide mixed with zinc dust, small amounts of zinc dissolve into the surface of the penny. This causes the penny to look silver since there is now a layer of zinc over the outside of the penny. The two metals, zinc and copper, do not react chemically.
How do you make copper look like gold?
The most amazing trick is to turn it into gold. Simply wash the coin and place it on a hotplate heated to about 300 Celsius. As it heats the zinc will diffuse into the copper, forming brass on the surface that looks like gold. Eventually it will wear off but the results are rather impressive.
How do you get gold in a lab?
Gold is the chemical element with 79 protons in each atomic nucleus. Every atom containing 79 protons is a gold atom, and all gold atoms behave the same chemically. In principle, we can therefore create gold by simply assembling 79 protons (and enough neutrons to make the nucleus stable).
Why do pennies change color in vinegar?
A penny is made of copper. The vinegar on the paper towel helps the copper in the penny easily react with the oxygen in the air to form a blue-green colored compound called malachite.
What is a 1943 silver penny worth today?
Value of a 1943 Steel Penny They are worth about 10 to 13 cents each in circulated condition, and as much as 50 cents or more if uncirculated.
Can you turn pennies green?
Pennies are made of copper. When copper is exposed to oxygen, it forms molecules called copper oxide that make pennies look dirty. As the penny dries and is exposed to the air, a chemical reaction occurs and the penny turns green! The green compound is called malachite.
Does the copper Penny now look silver?
Pre-1982 pennies are 95% copper and 5% zinc; post-1982 pennies are 97.6% zinc, coated with a thin electroplating of copper. It is called The Gold Rush—Turning Pennies into Silver and Gold, Catalog No.
How to make vinegar and salt for pennies?
You need just a few things for this experiment: Create a solution of vinegar and salt using one teaspoon of salt and 1/4 of a cup of vinegar. Mix until the salt is dissolved (it helps if the vinegar is a little warm). Add the pennies. Wait about 5 minutes, then remove the pennies from the solution.
How to make a science experiment with pennies?
You need just a few things for this experiment: Create a solution of vinegar and salt using one teaspoon of salt and 1/4 of a cup of vinegar. Mix until the salt is dissolved (it helps if the vinegar is a little warm). Add the pennies. Wait about 5 minutes, then remove the pennies from the solution. Dry the pennies with a paper towel.
What do you use to clean dull pennies?
If you have dirty, dull, or green pennies lying around, try the cleaning pennies science experiment to turn them bright again! You need just a few things for this experiment: Dull pennies Salt Vinegar Small container (we used a beaker) Paper towels
What kind of acid do you use to clean copper pennies?
This two-part chemistry experiment uses a household acid, vinegar, to clean copper pennies. Kids can observe the oxidation process as the copper in the pennies reacts with oxygen in the air to first form copper oxide and then malachite.