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evidence of chemical reactions
atoms of 1 or more substances are rearranged to form different substances
evidence of chemical change
temp change, color change, gas bubbles, precipitate-solid resulting from 2 clear liquids
-law of conservation-matter is neither created nor destroyed (matter is conserved during a reaction)
written out instructions of an equation
uses chemical formulas to identify reactants and products
must show how law of conservation of matter is obeyed
# atoms of reactants=?
# atoms of products
number written in front of a reactant or product.
-describes the lowest whole ration of amounts of all reactants and products
also called composition reactions; 2 elements or simple compounds combine to form new compounds; generally compounds produced are larger or more complex than the reactants
normally involve a substance reacting rapidly with oxygen gas, releasing heat and light
a single compound breaks down into 2 or more elements or less complex compounds; most are endothermic.
break down to metal chloride and oxygen gas
break down to metal oxide and carbon dioxide
break down to metal oxide and water
weak acids break down to non-metal oxide and water
certain metal oxides
metal oxide breaks down to metal and oxygen
electrolysis of molten salts
breaks down to the basic elements