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20 Cards in this Set
- Front
- Back
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Physical
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affect size, shape, and state of matter
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chemical
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produces new substance with different properties than the original- chemical reaction
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chemical equations
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various substances react to create new substances
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reactants
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substances that exist before the reactions
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products
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the result of the reaction
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chemical equations
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used by chemists to explain the products, physical state and proportions involved in a chemical reaction
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conservation of mass
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the mass of the products must equal the mass of the reactants
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low conservation of mass
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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
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Syntheisis
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2 or more substances combine to form a new more complex substance
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decomposotion
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a complex substance breaks down into two or more simpler substances
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single replacement
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an uncombined element replaces an element that is part of a compound
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double replacement
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different atoms in 2 different compounds replace eachother
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what happens to energy in chemical reactions
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energy is usually released or absorbed in chemical reactions
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enegy released
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products tend to be more stable when energy is relaeased. Energy can be releaed in the form of light, heat, sound, or electricity
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Exothermic reations
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are reactions that relaease heat
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heat released
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buring is an example of an exothermic reaction
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Rapid Release
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certain substances can speed up the release of heat
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slow release
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some materials combine with oxygen to release heat so slowly that you cannot see or feel it
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heat absorbed
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some reactants require heat to be added before theey can proceed.
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energy in the equation
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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
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