What must happen before a chemical reaction can begin?
a) the activation energy must be excee...
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Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line
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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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When did stem cell research become known ? who discovered stem cell? what experiments or studies have been conducted so far?
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