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Science 7 L9A

Science chemical reactions

QuestionAnswer
reactant substances at beginning (left side of equation)
product new substances (right side of equation)
precipitate solid that forms from solution during chemical reaction
endothermic reaction energy absorbed
exothermic reaction energy released
coefficient number in front of chemical equation, tells you how many atoms/molecules there are
synthesis put together, make more complex substance
decomposition break down into simpler products
replacement two elements in different compounds trade places
Chemical reaction one or more substances (reactants) undergo a chemical change to form one or more new substances (products) with different chemical properties
Yields “reacts to form”
Law of Conservation of Mass All atoms that are present at the beginning of a chemical reaction are present at the end of the reaction (matter is neither created nor destroyed)
Activation Energy The minimum amount of energy needed to start a chemical reaction
Subscript number, to the lower right of the element's symbol, shows how many atoms of that element are in the molecule.
Created by: jmeager
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