the ________- the substance that undergo a chemical change
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product
the _______- the new substance that was formed
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chemical equation
a chemical __________ is a representation of a chemical reaction in which the reactants and products are expressed as formulas
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coefficients
the big numbers in front of the formula
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reaction
when a substance undergoes a chemical change, a chemical _______ is occurring
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mass
during a chemical reaction, the ______ of the reactants always equals the mass of the product
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conservation of mass
the law of _______ __of__ ______ states that mass is neither created nor destroyed in a reaction
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atoms
in order to demonstrate this, the number of _______ of each element on the left side of the arrow must equal the number of atoms on the right side
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coefficient
you can balance the number of atoms by changing the _______ only
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subscript and formula
you cannot change the _____ __and__ _______
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decomposition reaction
a ________ _______ is when on compound breaks down into 2 or more products
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synthesis reaction
a _____ _______ is a reaction in which 2 or more reactants form one product
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double-replacement reaction
a ________-________ _____ is one in which 2 different compounds exchange ions and form 2 new compounds
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combustion reaction
a ______ ________ is one in which a substance reacts rapidly with oxygen, often producing heat and light
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number and type
just as we classify matter into different types, we can also classify reactions by different types based on the _____ __and__ _________ of reactants and products
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one
a synthesis reaction is a reaction in which 2 or more reactants form ______ product
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synthesis
decomposition is the opposite of ________
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single
a _______- replacement reaction is a reaction in which a single element takes the place of another element in a compound
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hydrocarbon and O2
in a combustion, the reacts are always a _____ __and__ ____
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chemical energy
_______ _______ is the energy stored in the chemical bonds of a substance
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exothermic reaction
if energy releases, this is an _____ ______
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endothermic reaction
if energy is absorbed by the surroundings is an ___ ______
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describe the energy changes that take place during a chemical reaction
during a chemical reaction, energy is either released or absorbed
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matter cannot be created or destroyed
explain how energy is conserved during a chemical reaction
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energy
the heat that is produced by a gas grill is a form of _______ released by the combination between propane and oxygen-- which produces carbon dioxide, water (in vapor form), and heat
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bonds & formation
chemical reactions involve the breaking of chemical ____ __in the reactants and the__ ______ of new and different chemical bonds in the product
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diagram
a reaction energy ______ shows the energy change between the reactants and products
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endothermic
if the reactants energy is lower than the products, then that means the reaction absorbed energy, so this is an _____ reaction
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released
if the reactants energy is higher than the products, then that means the reaction _______ energy, so this is an exothermic reaction
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conservation
this principle is the law of _______ of energy
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reaction rate
a ______ _____ is the rate at which reactions change into products over time
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describe the factors affecting chemical reaction rates
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