A radioactive isotope of copper decays as follows: 64 64 0
Cu → Zn + -1β
t 1/2= 12.8 hours
Starting with 84.0 g of 64∧Cu, calculate the quantity of 64∧Zn produced after 25.6 h.

the answer would be b i believe

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

because natural gas is colorless, odorless, and tasteless, distributors add mercaptan (a chemical that smells like sulfur) to give natural gas a distinct unpleasant odor (it smells like rotten eggs). they locate the types of rock that are likely to contain natural gas deposits.