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In chemical reactions, are bonds of reactants formed or broken? what about the products, are those formed or broken?
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Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?
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Particle model to predict what will happen if a sharp object creates a hole in the soccer ball
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What shape would a molecule with two bound groups and two lone pairs have?
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