Chemical Reactions
Where are reactants located in a chemical equation?
Balance the following equation: _____H2 + ____O2 ---> ____H2O
2 H2 + 1 O2 ---> 2 H2O
Balance the following chemical equation:
___ C + ___ S8 ---> ___ CS2
4 C + 1 S8 ---> 4CS2
Can a chemical equation only have one molecule as a reactant?
Yes
Where are the products located in a chemical equation?
On the right.
Which part of a chemical equation can you change to balance?
Coefficients
Balance the chemical equation:
__ Li + __ H2O ---> ___ LiOH + ___ H2
2 Li + 2 H2O ---> 2 LiOH + 1 H2
Define what it means to have a "balanced chemical equation"
Equal amounts of atoms on both sides
If you don't add a coefficient in front of a molecule, you have _______ of that molecule.
One
Balancing chemical equations:
____ N2 + ____ H2 ----> ____ NH3
1 N2 + 3 H2 --> 2 NH3
What does the arrow from reactants --> products mean?
Produces
What does the law of conservation of mass state?
The law of conservation of mass states that matter durning a chemical change can neither be created nor destroyed.
Which molecule should you balance LAST in this equation? O2 + CH4 --> CO2 + H2O
Oxygen, because it is in three different molecules it is likely the most challenging to balance.
Balance the following chemical equation: ___ N2 + ___ O2 ----> ___ N2O5
2 N2 + 5 O2 ----> 2 N2O5
What is the difference between a coefficient and a subscript?
Coefficients = how many molecules we have, subscripts = how many atoms we have in a molecule
Balance the following chemical equation:
____ C2H6 + ___ O2 ---> ____ CO2 + ____ H2O
2 C2H6 + 7 O2 ---> 4 CO2 + 6 H2O