Chemical Reactions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| activation energy | what is needed to start a chemical reaction
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| arrow | read as yields in a chemical formula
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| characteristics of a chemical reaction | changes in energy or properties
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| proof of chemical reaction | gas produced (bubbles); color change; precipitate forms; temperature change; odor
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| chemical equations | shorter, easier way to show chemical reactions by using symbols instead of words
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| coefficient | number placed in front of a chemical formula in an equation. Tells how many atoms or molecules of each reactant and product take part in the reaction
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| conservation of mass | the amount of matter involved in a chemical reaction does not change. The total mass of the reactants must equal the total moss of the products
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| controlling rates of reaction | concentration; temperature; surface area; catalysts, enzymes and inhibitors
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| concentration | amount of one material in a given amount of another material
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| temperature | higher heat causes faster reaction
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| surface area | increased surface area leads to increased reaction
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| catalysts | materials that increases the rate of reaction
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| enzymes | biological catalysts
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| inhibitors | decreases the rate of a reaction
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| decomposition reaction | a compound breaks down into simpler substances
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| endothermic reaction | a reaction that takes heat from the solution, absorbs energy, makes it feel cooler
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| exothermic reaction | a reaction that releases heat; gives off energy, makes it feel warmer
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| physical changes | alter only the physical properties of matter; no new substances formed
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| chemical changes | alter the chemical properties of matter; new substances with new properties are formed
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| proof of physical change | change in size, shape, color, or phase of matter
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| precipitate | a solid that forms from solution during a chemical reaction
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| products | the materials you have after a chemical reaction; written on the right side of the formula
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| reactants | the materials you have at the beginning of a chemical reaction; written on the left side of the formula
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| replacement reaction | one part of a compound is displaced by an element or compound from another substance
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| states of matter | solid, liquid or gas
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| subscripts | show the number of atoms of an element in a molecule or the ratio of elements in a compound
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| synthesis reaction | two substances combine to form a new compound
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Created by:
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