Chemistry, 28.02.2020 19:24 harodkdc8463
The half-life of carbon-14 is about 5,730 years. A tree fossil was estimated to have about 4.2 picograms of carbon-14 when it died. (A picogram is a trillionth of a gram.) The fossil now has about 0.5 picogram of carbon-14. About how many years ago did the tree die? Show your reasoning.
Answers: 2
Chemistry, 22.06.2019 06:00
Compare and contrast physical changes with chemical changes.
Answers: 1
Chemistry, 22.06.2019 10:30
Which characteristics can be used to differentiate star systems? check all that apply.
Answers: 2
Chemistry, 22.06.2019 23:10
Amines are good nucleophiles, even though they are neutral molecules. how would the rate of an sn2 reaction between an amine and an alkyl halide be affected if the polarity of the solvent is increased? amines are good nucleophiles, even though they are neutral molecules. how would the rate of an reaction between an amine and an alkyl halide be affected if the polarity of the solvent is increased? because both reactants in the rate-limiting step are neutral, the reaction will be faster if the polarity of the solvent is increased. because both reactants in the rate-limiting step are neutral, the reaction will be slower if the polarity of the solvent is increased. because both reactants in the rate-limiting step are neutral, the reaction will occur at the same rate if the polarity of the solvent is increased. request answer
Answers: 3
Chemistry, 23.06.2019 00:00
The graph indicates the running route for tobias. which best describes his run? from time 0 to 6, he went fast and then slowed down. from time 6 to 10, he was at his slowest. from time 12 to 14, he went very slow. from time 14 to 18, he went toward the starting point.
Answers: 2
The half-life of carbon-14 is about 5,730 years. A tree fossil was estimated to have about 4.2 picog...
Computers and Technology, 31.12.2021 16:30
Computers and Technology, 31.12.2021 16:40
Mathematics, 31.12.2021 16:50
History, 31.12.2021 16:50
Chemistry, 31.12.2021 16:50
Mathematics, 31.12.2021 16:50
Computers and Technology, 31.12.2021 16:50