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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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32p and 31p are two isotopes of phosphorus. compare the number if subatomic particles that are present in the atoms of these isotopes.
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Which of the following volumes is the smallest? a) one microliter b)one deciliter d)one liter c)one milliliter
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Chemistry, 23.06.2019 15:00
How many more valence electrons does sodium need to have a full outer valence shell
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When two or more substances combine, but each keeps it own properties, the new combination is called...
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