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25 Cards in this Set
- Front
- Back
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New substances are fromed from starting substances.
-often is not easily reversible. |
chemical change
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change producing same substance in a different state.
-often is easily reversible. |
Physical change
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separates two or more formulas
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+
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reacts to form products
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--->
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the reactants are heated
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^
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Solid
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(s)
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liquid
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(l)
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gas
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9g)
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Aqueous (descved in water)
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(aq)
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The energy need upon collision to break apart the bonds of reacting molecules.
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activation energy
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The number of items in a mole, equal to 6.02 x 10 to 23 power
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Avogadro's number
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The final form of a chemical equation that shows the same number of atoms of each element in the reactants and products.
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balanced equation
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A substance that increases the rate of reaction by lowering the activation energy.
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catalyst
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The formation of a new substance with a different composition and properties than the initial substance.
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chemical change
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A shorthand way to represent a chemical reaction using chemical formulas to indicate the reactants and products and coefficients to show reacting ratios.
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chemical equation
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The process by which a chemical change takes place.
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chemical reaction
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Whole numbers placed in front of the formulas to balance the number of atoms or moles of atoms of each element on both sides of an equation.
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coefficients
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A reaction in which reactants combin to form a single product.
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combination reaction
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A reaction in which a single reactant splits into two or more simpler substances.
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decomposition reaction
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A reaction in which parts of two different reactants exchange places.
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double replacement reaction
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A reaction that requires heat; the energy of the products is higher than the energy of the reactants.
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endothermic reaction
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A reaction that releases heat; teh energy of the products is lower than the energy of the reactants.
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exothermic reaction
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The group of ions represented by the formula of an ionic compound.
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formula unit
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The mass in grames of 1 mole of an element equal numerically to its atomic mass. The molar masses of the elements in the formula.
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molar mass
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A group of atoms, molecules, or formula units that contains 6.02x 10 to 23rd power of these items.
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mole
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