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 | you read the arrow says "yields" in a chemical equation or formula
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| Characteristics of a chemical reaction | changes in energy or changes in properties
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| Chemical Changes | alter the chemical properties of matter; new substances with new properties are formed
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| Chemical Equations | a shorter, easier way to show chemical reactions by using symbols instead of words
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| Coefficient | a 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 mass of the products
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| Decomposition Reaction | a compound breaks down into simpler substances
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| Exothermic | an observable change in energy that shows a chemical reaction took place; a reaction that releases heat; gives off energy, makes it feel warmer; most chemical reactions are this type
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| Endothermic | an observable change in energy that shows a chemical reaction took place; a reaction that takes heat from the solution, absorbs energy, makes it feel cooler
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| Physical changes | Alter only the physical properties of matter; no new substances are forms
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| Precipitate | a solid that forms from solution during a chemical reaction; observable change that shows a chemical reaction took place.
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| products | the materials you have after a chemical reaction; written on the right side
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| reactants | the materials you have at the beginning of a chemical reaction; written on the left side
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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,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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| Concentration | amount of material in a given amount of another material
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| catalyst | materials that increases the rate of reaction
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