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Parts of an Equation
Law of Conservation of Mass
Counting Elements
Balancing Equations
Types of reactions
100
In an equation, this is on the left side of the arrow.
What is reactants?
100

This is the reason we balance equations. 

What is the law of conservation of mass? What is reactants must equal products?

100

This is how many hydrogen atoms are in 3H20.

What is 6?

100

Is 2Al + 6HCl → 2AlCl3 + 3H2 balanced?

What is yes?

100

A  +  BX  🡪  AX  +  B

Single Replacement

200
On the right side of an equation, this is on the right side of the arrow.
What is products?
200
This number is NEVER adjusted when balancing equations.
What is the subscript?
200

This is how many sulfur atoms are in 2SO4?

What is 2?

200

Is 3N2+ H2 → 2NH3 balanced?

What is No?

200

AX  +  BY  🡪  AY  +  BX

 Double Replacement

300

This little number appears after the element

What is the subscript?

300
This is an equation where each side had the same numbers of atoms for each element represented.
What is a balanced equation?
300

How many Hydrogen atoms are in the reactants of this equation?

2Al + 6HCl → 2AlCl3 + 3H2

Six

300

Balance this equation:

__HCl + __Na → __NaCl + __H2

2 HCl + 2 Na → 2 NaCl + 1 H2

300

H2O -> H2 + O

Decomposition

400
This is the whole number that appears in front of a formula in a chemical equation.
What is a coefficient?
400

This is the definition of the Law of Conservation of Mass.

What is matter cannot be created or destroyed, only transformed? What is reactants equal products?

400

How many atoms of each element are there in the products of this reaction? (Al, Cl, and H)

2Al + 6HCl → 2AlCl3 + 3H2

Al = 2, Cl = 6, H = 6
400

Balance the following equation:

2KNO3  + __H2CO3  → __K2CO3  + __HNO3

2 KNO3  + 1 H2CO3  → 1 K2CO3  + 2 HNO3

400

C   +    O2    🡪    CO2

Sythesis

500
This is the only number you are allowed to manipulate when balancing equations.
What is the coefficient?
500
T/F: New atoms are formed as products in all chemical reactions.
What is false?
500

How many atoms of each element are in the reactant side of this equation? (Fe, O, C)

2 Fe2O3 + 3 C → 4 Fe + 3 CO2 

Fe = 4, O = 6, C = 3

500

Balance the following equation:

__TiCl4 + __H2O → __TiO2 + 4HCl

1 TiCl4 + 2 H2O → 1 TiO2 + 4 HCl

500

Na  +H2O  🡪 NaOH  + H2

Single Replacement