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