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1963 COPPER penny is worth half a billion dollars.
There are 60 seconds in a minute, so a half minute would be 30 seconds. If you have a length of time in half minutes, multiply that by 30 to get seconds. For example, 20 half minutes = 20 x 30 seconds = 600 seconds
You divide the top half by the bottom half example: 3/4= .75
more than a half
Divide it by 70.4202
Phisical
Cutting a piece of copper in half is a physical change because it only alters the physical appearance of the copper without changing its chemical composition.
It is a physical change since...well...no other chemicals are involved...copper is still copper.
Physical change
Physical change
Breaking a pencil in half could be an example of physical change, where the pencil's form is altered without changing its chemical composition.
If it's one you got in change or a bank roll and is copper-colored on the edge, there is absolutely no silver in it.
It is a physical change because only its shape changed, not its chemical composition.
The half equation for the reduction of copper oxide by carbon is: CuO + C -> Cu + CO
Copper and nickel.
Since 1971, U.S. half dollars have been made of nickel-coated copper (91.67% copper and 8.33% nickel).
Current half dollars are made copper and nickel.