Chemistry, 22.06.2020 01:57, sanchezp0821
In 1982, the United States government changed the way it minted pennies. Before 1982, pennies were made of 95% copper and 5% tin. Now they are made of 97.5% zinc coated with copper. Because they weigh different amounts (have different masses) and are still the same item, they make a good model for studying isotopes.
4. What do the two kinds of pennies represent in this exercise?
5. How do the pennies differ? How do isotopes differ?
6. What do the pennies have in common? What do isotopes have in common?
Answers: 3
Chemistry, 21.06.2019 23:10, ChloeLiz7111
Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.
Answers: 1
Chemistry, 22.06.2019 06:30, dimondqueen511
How many moles of carbon dioxide will form if 2.5 moles of c3h8 is burned
Answers: 1
Chemistry, 22.06.2019 09:40, keiracoles
How many grams of aluminum will there be in 98g of al2o3?
Answers: 1
In 1982, the United States government changed the way it minted pennies. Before 1982, pennies were m...
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