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2)what’s the difference between a physical change and a chemical change.
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Choose all the answers that apply. ionic compounds dissolve easily in water do not dissolve in water have low melting points have high melting points conduct electricity when melted
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Use examples from the article to explain one positive and one negative effect that chemistry has had on society.
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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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2)what’s the difference between a physical change and a chemical change....
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