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chemistry part 2
Question | Answer |
---|---|
activation energy | what is needed to start a chemical reaction |
arrow | means yeild |
characteristics of a chemical reaction | changes in or changes in properties |
chemical changes | alter the chemical properties of matter new substaces with new properties are formed |
chemical equations | a shorter easier way to show chemical reactions by using symbols instead of words |
coefficent | a number placed in front of a chemical formula in a equations tells how many atoms or moluclues of each reactant |
conversation of mass | the amount of matter involved in a chemical reaction does not change the total mass of the reactants must equal the total mass |
decomposition reaction | a compound breaks down into simpler substaces |
endothermic reaction | an observable change in energy that shows a chemical reaction took place a reaction that takes heat from the solution |
physical change | alter only the physical properties of matter no new substances are formed can be in any sized |
preciptate | a solid that forms solution during a chemical reaction observable change that took place |
products | the materials you have after a chemical reaction written on the right side of the formula |
reactants | the materials you have at the being of the chemical reaction |
replacement reactants | one part of a compound is displaced by an element or compound from another substace |
states of matter | solid liquid gas |
subscripts | show the number of atoms or an element in a molecloue |
synthesis reaction | 2 substances combine to form a new compound |