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Chemical Reactions
How to Balance Equations
Balancing Chemical Equations
Extra
100

Where are reactants located in a chemical equation?

On the left
100
What is the FIRST step to balancing chemical equations?
Draw a T-Chart and list the elements
100
Balance the following equation: _____H2 + ____O2 ---> ____H2O
2 H2 + 1O2 ---> 2H2O
100

Can a chemical equation only have one molecule as a reactant?

Yes

200

Where are the products located in a chemical equation?

On the right.

200

Which part of a chemical equation can you change to balance?

Coefficients

200
Balance the following Equation: _____KClO3 ---> KCl + ______O2
2KClO3 ---> 2KCl + 3O2
200

Define what it means to have a "balanced chemical equation"

Equal amounts of atoms on both sides

300
Identify the reactants and products in the following chemical equation: H2 + NaCl ---> H2Na + Cl + S
Reactants: H, Na, Cl Products: H, Na, Cl, S
300

If you don't add a coefficient in front of a molecule, you have _______ of that molecule.

One

300
Balance the following equation: ____C3H8 + _____O2 ---> ____CO2 + ____H2O
1C3H8 + 5O2 ---> 3CO2 + 4H2O
300

What does the arrow from reactants --> products mean?

Yields

400

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.

400
What is the THIRD step of balancing a chemical equation?
The third step is to adjust the coefficient of each molecule to balance out equally.
400
Balance the following equation: ____P + _____O2 --->_____P2O5
4P + 5O2 ---> 2P2O5
400

List ONE trick in balancing equations that you could use to help you. 

Odd/even, oxygen last

500

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

500
What is one reason that we balance chemical equations?
To validate that the Law of Conservation of Mass is true.
500
Balance the following equation: ___NaBr + ____CaF2 ---> ____NaF + ____CaBr2
2NaBr + 1CaF2 ---> 2NaF + 1CaBr2
500

Can a chemical reaction still occur if we take away one of the reactants? Why or why not?

No- because products are simply rearranged reactants, if we take away a reactant, products can't form.