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Chemistry, 05.07.2019 00:00 russelllang606
Which of these is an indication that a chemical reaction has occured? formation of a precipitate melting of a substance boiling of a substance freezing of a substance
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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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Which of these is an indication that a chemical reaction has occured? formation of a precipitate me...
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