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Chlorine

 https://docs.google.com/presentation/d/115Tb_JC0p9PvvEP18gmK-uFBWlhz4JT_/edit?usp=drivesdk&ouid=115519660282484634865&rtpof=true&sd=true https://docs.google.com/presentation/d/115Tb_JC0p9PvvEP18gmK-uFBWlhz4JT_/edit?usp=drivesdk&ouid=115519660282484634865&rtpof=true&sd=true
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Fat

 https://docs.google.com/presentation/d/1fmkwGVRpoK0vnMkPOa8_KUeht7XnvDSx/edit?usp=drivesdk&ouid=115519660282484634865&rtpof=true&sd=true https://docs.google.com/presentation/d/1fmkwGVRpoK0vnMkPOa8_KUeht7XnvDSx/edit?usp=drivesdk&ouid=115519660282484634865&rtpof=true&sd=true
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Acid rain

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Oscillation

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Fuel cell hydrogen

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Food for health

 https://docs.google.com/presentation/d/1On5jgEFSiR70nOIKzEsrOrs8E8ifGvol/edit?usp=drivesdk&ouid=115519660282484634865&rtpof=true&sd=true https://docs.google.com/presentation/d/1On5jgEFSiR70nOIKzEsrOrs8E8ifGvol/edit?usp=drivesdk&ouid=115519660282484634865&rtpof=true&sd=true
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Physical and chemical change

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