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Which of the following is a physical change? A) Condensation forms on cold glass. B) Glass reacts with hydrofluoric acid. C) A ground glass joint

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Which of the following is a physical change? A) Condensation forms on cold glass. B) Glass reacts with hydrofluoric acid. C) A ground glass joint slowly forms sodium silicate when exposed to NaOH. D) Cobalt salts dissociate in a piece of blue stained glass. E) Silica is hydrated, forming silicic acid

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