Chemistry, 09.02.2021 20:40 isabella20142002
18. A radioactive element has a half-life of 18,000 years. There was 400 grams of the element
originally. There is now 12.5 grams of the radioactive element left. What is the age of the
sample?
Answers: 2
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An object becomes electrically charged when: electrons are created in it electrons from it are destroyed electrons are transferred to it protons from it are destroyed protons are created in it
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Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?
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The table lists the lattice energies of some compounds.compoundlattice energy (kj/mol)lif –1,036licl –853naf –923kf –821nacl –786which statement about crystal lattice energy is best supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf.the lattice energy increases as the cations get larger, as shown by lif and licl.the lattice energy decreases as cations get smaller, as shown by nacl and naf.the lattice energy decreases as the cations get smaller, as shown by naf and kf.
Answers: 3
18. A radioactive element has a half-life of 18,000 years. There was 400 grams of the element
origi...
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