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Is it physical change or chemical change when you smooth a wood chair with sandpaper?
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Calculate the temperature rise when 0.2g of propane is used to heat 400cm cubed of water.
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Why is any chemical reaction always balanced? give reasons and explain the easiest way to solve the balancing problems in chemical equations with stoichiometric coefficients upto 20 as hit and trial doesn't always work. give full reasoning
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Is it physical change or chemical change when you smooth a wood chair with sandpaper?...
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