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Aring made of gold is heated and then hammered into a flat, coin-like shape. is this a physical change? explain.
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Which type of energy is transferred by convection currents?
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Examine the drawing of a molecule. each ring represents an atom of nitrogen (n). what’s the chemical formula of this substance?
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Aring made of gold is heated and then hammered into a flat, coin-like shape. is this a physical chan...
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