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ATOMS AND MOLECULES
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When the properties of the substances present remain the same, are we talking about a mixture or a compound being formed?
Mixture
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Water is made up of two atoms of hydrogen bonded to one of oxygen, giving H2O. This means, if there are 600 H molecules, there are ___ O molecules
-
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H, Na, He is the symbol of.....
Hydrogen
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what is the purpose of a chemical reaction, and explain how products are formed
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In solids, particles move the fastest. True or False and say why
False
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Draw C atom
-
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When substances are simply mixed together, without chemical reaction, are we talking about a mixture or a compound being formed?
Mixture
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define atomic and mass number
-
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Give an example of an element, compound and molecule
(any in the periodic table)
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Draw Na+
-
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Create K+
False
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Give an example of a synthesis reaction
water, ammonia, H2, etc
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atoms of different elements can combine to make
molecules
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Create O-2
a compound breaks down to form two or more substances
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Define an element, compound and molecule
-
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Which are the two main elements that compose the universe?
Hydrogen and Helium
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