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What is the collection of protons and neutrons in the center of an atom called
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When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?
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What is the collection of protons and neutrons in the center of an atom called...
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