atoms, elements and compounds
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7 Terms
1
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what are all substances made of
atoms
2
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what is an atom
smallest part of an element that can exist
3
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roughly how many elements are there
100
4
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how are compounds formed
from elements by chemical reactions
5
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what do chemical reactions tend to involve
-formation of one or more new substances
-often involve detectable energy change
6
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what are compounds
contain two or more elements chemically combined in fixed proportion
7
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how can compounds be separated into elements
by chemical reactions
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