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20 Cards in this Set

  • Front
  • Back
process in which one or more substances change to make one or more new substances
chemical reaction
in a ____ ____ the new substances will have different chemical and physical properties
chemical reaction
name the 4 signs of chemical reactions
color change; gas forms; precipitate forms; energy forms
solid substance that forms in a solution
what happens to the chemical bonds when new substances are formed?
the molecules bump into each other, the bonds break, atoms rearrange, and new bonds are formed
combination of chemical symbols and numbers to represent a substance
chemical formula
_____ _____ show how many atoms of each kind are present in a molecule
chemical formulas
if it's used in a convalent compound, it uses ____ to help write a formula
uses chemical symbols and formulas as a short cut to describe a chemical reaction
chemical equation
the things that you start with
the substances form in a reaction
atoms are never ___ or ___ in a chemical reaction, they're just rearranged
lost or gained
french chemist who stated the total mass of
reactants = total mass of products
a number that is placed in front of a chemical symbol or formula
energy is used in the reaction (reactants)
energy is a product of the reaction (product)
name the 4 types of chemical reactions
synthesis, decomposition, single-displacement, double-displacement
reaction in which 2 or more substances combine to form 1 new compound
synthesis reaction
reaction in which a single compound breaks down to form 2 or more simpler substances
decomposition reaction
reaction in which an element replaces another element that is part of a compound. the products of ________ are a new compound and a different element
single-displacement reaction