Chemistry, 20.02.2022 19:30, spencertodd742
Calcium-49, a radioactive isotope, has a half-life of 9 minutes. If an 80-gram sample of the isotope decays for 27 minutes, how many grams of the original sample remain?
Select one:
a. 60
b. 10
c. 40
d. 20
Answers: 2
Chemistry, 21.06.2019 16:30, KieraKimball
10-14. (a) when 100.0 ml of weak acid ha were titrated with 0.093 81 m naoh, 27.63 ml were required to reach the equivalence point. find the molarity of ha. (b) what is the formal concentration of a- at the equivalence point? (c) the ph at the equivalence point was 10.99. find pk. for ha. (d) what was the ph when only 19.47 ml of naoh had been added?
Answers: 1
Chemistry, 21.06.2019 21:00, advancedgamin8458
Consider the nuclear equation below. 239 > x + 4 he 94 2 what is x? 1.235 cm 96 2.243 u 92 3.235 u 92 4.243 cm 96
Answers: 2
Chemistry, 22.06.2019 07:00, misspicafunpoke
Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane
Answers: 2
Calcium-49, a radioactive isotope, has a half-life of 9 minutes. If an 80-gram sample of the isotope...
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