Chemical Equations
Those substances in a chemical reaction that exist before the reaction takes place
What are reactants?
A reaction in which two simple substances combine to form a new, more complex substance
What is combination/synthesis?
This represents the number of shells or energy levels in an atom
What is the principal quantum number?
The slowest step in a reaction mechanism
What is the rate-determining step?
This is the number of centimeters in a meter
What is 100?
A substance that increases the speed of a chemical reaction but is not consumed in the reaction
What is a catalyst?
A reaction in which a complex substance is broken into two or more simple substances
What is decomposition?
The first subdivision of a principal energy level
What is sublevel/subshell?
In thermodynamics, the name for the total of all the energy in a substance
What is enthalpy?
A substance made of two or more kinds of atoms chemically combined
What is a compound?
Number placed in front of each formula in a balanced chemical equation
What is a coefficient?
A reaction in which a free element becomes an ion and an ion becomes a free element
What is single replacement?
The first subdivision of a sublevel, where electrons are found
The change in enthalpy in a chemical reaction
What is the heat of reaction?
The SI unit of temperature
What is kelvin?
Placing coefficients in a chemical equation to ensure that the number of each type of atom in the reactants is equal to the number in the products
What is balancing a chemical equation?
A reaction in which the cation of one substance exchanges with the cation of the other substance
What is double replacement?
The four letters representing the four kinds of subshells in an atom
What are s, p, d, and f?
The heat when one mole of a substance is formed from its elements
What is the heat of formation?
The sum of the number of protons and neutrons in an atom
What is the mass number?
A reaction that releases energy as one of the products
What is an exothermic reaction?
An insoluble substance formed in a chemical reaction
What is a precipitate?
In increasing order, the four numbers of electrons found in the orbitals of an atom.
What is 2, 6, 10, and 14?
A measure of the disorder or randomness in a system
The formula for calcium chloride
What is CaCl2?