what 3 main groups is the periodic table split into?
metals, semi metals and non metals
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what are 2 or more atoms chemically bonded called?
a compound
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what do chemical equations show?
the reactants and products produced
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why is it important that equations are balanced?
because you cant destroy or create atoms (law of conservation of mass)
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why does it look like the law of conservation of mass is broken in reactions involving gases in open containers?
gas can evaporate out of the container or gas from outside can react with gas in the container
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what are the key feature of compounds?
they have a fixed composition, a chemical reaction must take place to separate the element in the compound, there are chemical bonds between the atoms in the different element in the compound
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what are the key features of mixtures?
they have no fixed composition, different compounds or elements in the mixture can separate easier than compounds, no chemical bonds in the atoms in the different substances in the mixture
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what are the 4 different methods of separating mixtures?
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