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Chemistry, 21.06.2019 20:00
Different isotopes indicate that an element will have different numbers of
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Chemistry, 22.06.2019 12:00
Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.
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Chemistry, 23.06.2019 02:50
Select the correct location on the image identify the element that humans need to breathe. 2015 er r ights reserved
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