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science chemistry 1

8th grade

physical changes alter form or appearance
pc do physical changes change into another substance no
pc they can bend crush and tear
pc they are states of matter
chemical changes change the composition
cc - atoms are rearranged
cc they form new compounds and substances
cc they burn and rust
reactants substances that undergo the change
products new substance
chemical reactions involve changes in properties and energy that can be observed
the only evidence of a chemical reaction is that one or more new substance is formed
precipitate solid to liquid
gas bubbles
color change
exothermic rxn energy is released
endothermic rxn energy is required
chemical equations use chemical formulas to to show a rxn
chemical formulas are a combination of letter symbols to form a compound
chemical equations start and end
law of conservation of mass matter cannot be created or destroyed
synthesis taking two things and making them into one
decomposition to break apart
replacement single trade places
replacement double flip places
Created by: kerrie.reed