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What is true about the atoms at the start of a chemical reaction compared to the atoms at the end of the reaction

What is true about the atoms at the start of a chemical reaction compared to the atoms at the end of the reaction
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What is true about the atoms at the start of a chemical reaction compared to the atoms at the end of the reaction

User Stuart Grassie
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there is always the same number of atoms at start and end, no atoms 'disappear' and none are 'made'
User Deepshikha
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