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Spencer Bruce
Physics
27 July, 23:36
Five kinds of physical and chemical changes?
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Jean
27 July, 23:50
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A physical change to metal rod: it bent
a chemical change to a metal rod: it rusted
the difference between the two changes is when something (an element) undergoes a chemical change some type of chemical reaction changes the element but the change isnt always visable but if the change is physical like a bent metal rod the change has effected the element physically meaning visable
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