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25 Cards in this Set

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