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Chemistry, 22.06.2019 00:00
Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.
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Chemistry, 22.06.2019 00:30
What does x represent in the formula for the compound xcl4?
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Chemistry, 22.06.2019 14:00
What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?
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Chemistry, 22.06.2019 15:00
Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude
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Physical removal of an invasive species is an example of . a. mechanical control c. biological contr...
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