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Chemistry, 22.06.2019 12:00
Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.
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Chemistry, 22.06.2019 14:00
Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules
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Chemistry, 23.06.2019 12:30
Is the genie in the bottle experiment a physical or chemical change/reaction?
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Mathematics, 17.02.2020 22:27
Mathematics, 17.02.2020 22:27
History, 17.02.2020 22:27