Chemistry Reactions, Counting Atoms and Balancing Quiz

chemical reaction

one or more elements are changed into one or more different substances

The Law of Conservation of Mass

matter is never created or destroyed

reactant

the original substance

product

the new substance

3

3CO₂ amount of moles (coefficient)

2

3CO₂ amount of atoms (subscript)

3 moles 15 atoms

3CH₄ amount of moles (coefficient) and atoms (subscript)

1 mole and 7 atoms

Al(OH)₃ amount of moles (coefficient) and atoms (subscript)

synthesis

two or more substances combine to form a new compound

decomposition

a compound decomposes into two or more simpler substances

combustion

a substance will combine with oxygen and in the process give off energy in the form of light and heat

single replacement

one element replaces another element in a compound

double replacement

two ionic compounds exchange ions in solution to form two new compounds