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A spacecraft left Earth to collect soil samples from Mars. Which statement is true about the strength of Earth’s gravity on the moving spacecraft?What is the sum of and ?
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The first element on the periodic table of elements is carbon. a. true b. false
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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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How many moles of gas are present if p=11 atm, v=12l, t=185k?
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Based on its chemical properties, identify the position of each chemical family on the periodic table.
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