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Combustion
an exothermic chemical reaction in which a fuel reacts with oxygen.
Oxidation
a positive or negative number showing the electric charge on an element when it forms a compound
temperature change
Releasing or absorbing energy is often observed as a(n) ________ in the new substance being formed.
Composition change
all reactions experience a(n) ________, some more obvious than others.
Odor
some chemical reactions produce a distinctive smell.
Precipitate
sometimes when two liquids are mixed together, a solid will separate from the mixture.
Surface area
reactions happen only where the reactants are in direct contact If the ________ of the reactants is increased, then more reactant particles will be in contact with each other and more reactions will take place.
Product
a substance that is formed during a chemical reaction.
Chemical reaction
a process that rearranges the atoms in one or more substances into one or more new substances.
Reduction
a gain of electrons in a chemical reaction.
Concentration
________: as the ________ reactants- how many particles are in a certain volume- it is increased, more collisions occur, increasing the rate of reaction.
Double replacement
a chemical reaction in which two compounds swap cations or anions with each other.
Bubbles
a chemical reaction between two liquids may produce a gas.
Collision model
the model that states that for a reaction to occur, the reactant particles must collide with each other, with the proper alignment, and with enough energy.
Color change
the new substance formed by a chemical reaction may be a different color than the original substances.
Temperature
increased temperature means the particles move faster, resulting in more reactions.
chemical reaction
a process that rearranges the atoms in one or more substances into one or more new substances
bubbles
a chemical reaction between two liquids may produce a gas
precipitate
sometimes when two liquids are mixed together, a solid will separate from the mixture
energy released
many chemical reactions release energy, which can be in any of many forms
odor
some chemical reactions produce a distinctive smell
temperature change
chemical reactions typically release or absorb energy
color change
the new substance formed by a chemical reaction may be a different color than the original substances
composition change
all reactions experience a composition change, some more obvious than others
burning
other chemical reactions produce a visible flame as they react
chemical equation
a combination of chemical formulas and symbols that models a chemical reaction
reactant
a substance that enters into a chemical reaction
product
a substance that is formed during a chemical reaction
mole
SI fundamental unit for the quantity of matter in a substance; a count equal to 6.022 x 10^23
molar mass
the mass of one mole of a substance
synthesis reaction
a chemical reaction in which two or more reactants combine into a single, more complex product
decomposition reaction
a chemical reaction in which a single reactant breaks down into two or more products
single-replacement reaction
a chemical reaction in which one element in a compound is replaced by another element
double-replacement
a chemical reaction in which two compounds swap cations or anions with each other
combustion
an exothermic chemical reaction in which a fuel reacts with oxygen
oxidation
a positive or negative number showing the electric charge on an element when it forms a compound '
reduction
a gain of electrons in a chemical reaction
exothermic reaction
a chemical reaction that releases more thermal energy than it absorbs
endothermic reaction
a chemical reaction that absorbs more thermal energy than it releases
activation energy
the minimum energy needed for a chemical reaction to occur
law of conservation of energy
the law that states that matter can neither be created or destroyed but only transferred between objects
collision model
the model that states that for a reaction to occur, the reactant particles must collide with each other, with the proper alignment, and with enough energy
reaction rate
the speed of a reaction
surface area
reactions happen only where the reactants are in direct contact If the surface area of the reactants is increased, then more reactant particles will be in contact with each other and more reactions will take place
stirring
stirring the reactants moves more reactants into contact with each other, causing more reactions to occur
temperature
increased temperature means the particles move faster, resulting in more reactions
precipitate
sometimes when two liquids are mixed together, a solid will separate from the mixture. the solid that forms is called a precipitate
energy released
many chemical reactions release energy, which can be in any of many forms.
burning
other chemical reactions produce a visible flame as they react
chemical equation
a combination of chemical formulas and symbols that models a chemical reaction
reactant
a substance that enters into a chemical reaction
mole
SI fundamental unit for the quantity of matter in a substance; a count equal to 6.022 x 10^23
synthesis reaction
a chemical reaction in which two or more reactants combine into a single, more complex product
decomposition reaction
a chemical reaction in which a single reactant breaks down into two or more products
single-replacement reaction
a chemical reaction in which one element in a compound is replaced by another element
exothermic reaction
a chemical reaction that releases more thermal energy than it absorbs
endothermic reaction
a chemical reaction that absorbs more thermal energy than it releases
activation energy
the minimum energy needed for a chemical reaction to occur
law of conservation of energy
the law that states that matter can neither be created or destroyed but only transferred between objects
concentration
as the _____________ reactants - how many particles are in a certain volume - it is increased, more collisions occur, increasing the rate of reaction
