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Chemical Reactions
Vocabulary
Balancing Chemical Equations
How to Balance Equations
100

Where are the reactants located in a chemical equation?

The reactants are located on the left side of the equation.

100
By definition, the Law of Conservation of Mass states that matter (mass) may not be __________ nor _________ .
What is created / destroyed.
100
Balance the following equation: _____H2 + ____O2 ---> ____H2O
2 H2 + 1O2 ---> 2H2O
100

What is the FIRST step to balancing chemical equations?

List all the elements

200

Where are the products located in a chemical reaction?

The products are located on the right side of the equation.

200

What does a plus sign typically represent in a chemical equation?

It represents "reacts with"

200
Balance the following Equation: _____KClO3 ---> KCl + ______O2
2KClO3 ---> 2KCl + 3O2
200
Which part of the chemical equation are you to add or change.
The Coefficients
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
Twelve grams of reactant X react with fifteen grams of reactant Y. This is the total mass of the product(s).
What is twenty seven grams?
300
Balance the following equation: ____C3H8 + _____O2 ---> ____CO2 + ____H2O
1C3H8 + 5O2 ---> 3CO2 + 4H2O
300
Within a chemical formula, if you don't see a subscript, you can conclude that there are how many atoms of that element within each molecule.
One
400

What does the law of conservation of mass states?

The law of conservation of mass states that matter during a chemical reaction can neither be created nor destroyed.

400

What does the arrow in a chemical equation represent?

It represents a reaction has occurred and that something was "produced" or "yield"

400
Balance the following equation: ____P + _____O2 --->_____P2O5
4P + 5O2 ---> 2P2O5
400

What is the third step in balancing an equation?

The third step is to adjust the coefficient of each molecule to balance out equally.

500

Where is a subscript located in a chemical equation? Also, how many atoms does each element have in the following chemical equation: NaOH + H2CO3 ---> Na2CO3 + H2O

A subscript is written below. Reactant - 1Na, 4O, 3H, 1C Product - 2Na, 1C, 4O, 2H

500

Where can a coefficient be found on a chemical equation?

In front of a free element or formula.

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