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20 Cards in this Set

  • Front
  • Back
affect size, shape, and state of matter
produces new substance with different properties than the original- chemical reaction
chemical equations
various substances react to create new substances
substances that exist before the reactions
the result of the reaction
chemical equations
used by chemists to explain the products, physical state and proportions involved in a chemical reaction
conservation of mass
the mass of the products must equal the mass of the reactants
low conservation of mass
nothing is lost or created in a chemical reaction. there has to be same number of element on the reactant side as there are on the product's side
2 or more substances combine to form a new more complex substance
a complex substance breaks down into two or more simpler substances
single replacement
an uncombined element replaces an element that is part of a compound
double replacement
different atoms in 2 different compounds replace eachother
what happens to energy in chemical reactions
energy is usually released or absorbed in chemical reactions
enegy released
products tend to be more stable when energy is relaeased. Energy can be releaed in the form of light, heat, sound, or electricity
Exothermic reations
are reactions that relaease heat
heat released
buring is an example of an exothermic reaction
Rapid Release
certain substances can speed up the release of heat
slow release
some materials combine with oxygen to release heat so slowly that you cannot see or feel it
heat absorbed
some reactants require heat to be added before theey can proceed.
energy in the equation
if energy is written on the reactant side represents endothermic reactions i.e. heat is needed. if energy is written on the product side it represents endothermic reactions i.e. heat is given off