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chemical reactions
Term | Definition |
---|---|
activation energy | what is needed to start a chemical reaction |
arrow | you read the arrows as yields in a chemical equation or formula |
characteristics of a chemical reactions | changes in energy or changes in properties color change precipitate forms or temperature. |
chemical changes | alter the chemical properties of matter |
chemical equations | a shorter easier way to show chemical reactions by using symbols instead of words |
coefficient | a number placed in front of a chemical formula in a equation |
conservation of mass | the amount of matter involved in a chemical reaction that does not change |
decomposition reaction | a compound breaks down into simpler substances |
endothermic reaction | an observable change in energy that shows a chemical reaction took place |
exothermic reaction | an observable change in energy that shows that a chemical reaction took place gives of energy makes it feel warmer |
physical changes | alter only physical properties of matter no new substances are formed |
precipitate | a solid that forms from a solution during a chemical reaction. observable changes that show a chemical reaction took place |
products | the materials you have after a chemical reaction |
reactants | the materials you have at the beginning of a chemical reaction |
replacement reaction | one part of a compound is displaced by an element or compound from another substance. |
states of matter | solid liquid gas |
subscripts | show the number of atoms of an element in a molecule or the ratio of elements in a compound |
synthesis reaction | two substances combine to form a new coumpound |