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chemical reactions info

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Question
Answer
Physical Change:   affectsonly the physical properties or characteristics...does not change chemical identity  
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Chemical Change:   affects chemical structure and composition...identity is changed and properties change  
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Chemical reaction:   the process through which a chemical change occurs  
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What are the evidences that a chemical reaction occured?   production of gas(bubbles), change in color or odor, formation of a percipitate(a solid that is formed when 2 liquids are mixed), absorbtion/release of heat/light, permanet change in identity.  
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How many evidences are there?   5  
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coefficient?   balance out matter in a reaction  
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reactants?   what is used or what is at the start of a chemical reaction  
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products?   what is made during/after a chemical reaction  
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subscripts?   show the ratio of elements in a compound  
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Synthesis Reaction:   When many reactants create 1 procuct  
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Decomposition Reaction:   reaction in which 1 reactant makes many productEx.: H2Co3 -> H2O + CO  
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double replacement reaction:   reaction where 2 elements (or ions) in 2 different compounds switch placesNaCl + AgF -> NaF + AgCl  
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single replacement reaction:   reaction where one element from one compound switches places with one element from another compound.Zn + 2HCl -> ZnCl2 + H2  
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Endothermic reactions:   chemical reactions where energy is absorbed.heat + 6Co2 + 6H2O -> C2H12O6 + 6O2  
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Exothermic reaction:   energy is released2Al + Fe2O3 -> Al2O3 + 2Fe + heat  
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reactivity:   how easily an atom reacts with others  
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Action activity:   minimum amount of energy needed to start a chemical reaction  
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Reaction Rate:   how fast a reaction occurs...can be affected by 2 things:Catalysts and Inhibitors  
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Catalysts:   speed up reactions but are not used up in the reaction  
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Inhibitors:   slow a reaction down  
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Created by: hannahcoffman
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