Chem 8 study guide Flashcards
Describe a chemical reaction
a process in which one or more substances are converted into new substances in order for the atoms to achieve full valence shells and therefore greater stability
The substances present before a chemical reaction occurs are called the
Reactants
The substances present after a chemical change has occurred are called the
Products
Chemical reactions occur because
atoms can reach more stable arrangements.
In a chemical equation the symbol “→” means __, and the symbol “+” means __
Yield, and
In a chemical equation the ___ are places on the left of the arrow, and the ___ on the right of the arrow
Reactants, products
The law of conservation on matter states
“matter can be neither created nor destroyed in a chemical reaction”
What must be equal in a balanced chemical equation?
“The number of each type of element in the reactant and products”. or “the mass of the reactants and the mass of the products”
What is the difference between a subscript and a coefficient in a chemical equation?
A subscript describes the number of atoms of an element in a particular formula unit. whereas a coefficient describes the number of formula units.
The number of atoms of an element in a compound is shown using
Subscripts
The number of molecules present in a balanced chemical equation is shown using
Coefficients
(s)
Solid
(l)
Liquid
(g)
Gas
(aq)
Acid or aqueous solution
