Chemistry, 08.05.2021 18:30 he0gaubong
A 464.8 ng sample of an unknown radioactive substance was placed in storage and its mass measured periodically. After 47 days the amount of radioactive substance had decreased to 58.10 ng. How many half‑lives of the unknown radioactive substance have occurred?
Answers: 3
Chemistry, 22.06.2019 12:00
An atom's configuration based on its number of electrons ends at 3p4. another atom has seven more electrons. starting at 3p, what is the remaining configuration? 3p63d34s2 3p43d54s2 3p64s23d3 3p44s23d
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Chemistry, 22.06.2019 19:50
If a gas has an initial pressure of 101kpa and a volume of 10l, then it expands to a volume of 20l, what is the new pressure?
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Chemistry, 23.06.2019 01:00
What type of chemical bond is formed between two atoms of bromine 1. metallic 2. hydrogen 3. ionic 4. covalent
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A 464.8 ng sample of an unknown radioactive substance was placed in storage and its mass measured pe...
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