Which statement best describes why radioactive atoms can be used to date materials?
A.
Nonrad...
Which statement best describes why radioactive atoms can be used to date materials?
A.
Nonradioactive atoms in rocks eventually turn into radioactive atoms.
B.
The Sun interacting with atoms in a rock causes new atoms to form over time.
C.
The ratio of radioactive atoms to other kinds of atoms changes over time.
D.
The number of radioactive atoms in a substance increases over many years.
Answers: 2
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Answer asap need by wednesday morning explain how a buffer works, using an ethanoic acid/sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.
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Chemistry, 22.06.2019 22:30
Why is it possible for different microorganisms to extract energy not only from carbohydrates and other biological molecules but from a large variety of substances?
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