It depends VERY much on their date, condition, and mint mark.
Numismaticly, modern cents from the 1950s to today are only worth a penny. Older ones may or may not have more value as collectibles. When you get back to cents from the 1930s and earlier, most but not all of them are worth more to collectors. Go to a site like http://www.numismedia.com/fmv/fmv.shtml and look for their price guides as a start.
However the question about selling them for scrap is moot for two reasons. First a dealer would be paying wholesale and you'd need buckets and buckets of coins to make it worth their while to melt them, because scrap dealers need to work in bulk. Second and more importantly, it's illegal to melt cents and nickels so any scrap dealer who dealt in them would be putting their job at serious risk.
But IF you did collect pennies that are pre 1982, then the value of your collection materially would be 2.5 times the face value of the coins. This is because the price of copper is close to $4 per pound and pre 1982 pennies are 95% copper.
One roll of pennies has a face value of a 50 cents. However, if there is a penny in the roll that is worth more than 1 cent the roll will be worth more.
Due to the rising price of copper, pennies were worth more than face value.
For the most part those made before the 1960s are the ones worth keeping.
any copper penny is worth more than its face value.
Only high grade mint state coins have more than face value.
You need to provide much more information. Pennies have been made since the 1700s! Common pennies from circulation are worth only face value. Wheat pennies are usually common and worth a few cents to a few dollars in circulated condition. Indian head pennies are worth a few bucks in average grades.
The pennies value is a bit more then it's worth
If you are talking about US coins. They aren't. Both are worth face value unless in a mint set or completely flawless (it won't be completely flawless if you find it in your pocket change!).
More information is needed, please be more specific and post new question.
For a coin it is just worth the value stamped on it i.e. the value on it's face So a common coin is worth face value, but a rare coin is worth more than face value.
Yes. Silver coins are worth more than face value.
Pennies minted in this time were made of more copper than the pennies minted today. These pennies (made of 95% copper) are technically only worth the face value. However, while it is not yet legal to melt them down, they contain a higher metal value of about $0.0254 or 2.54 cents. Some of the older coins, especially those in great condition, are worth closer to 3 or 4 cents.