balancing equations #1. 2013

You Will Need:1. Counting Total Atoms– 2 pages

4 sides – Due NOW2. Log #4 (Update on-line) 3. Pencil, Periodic Table (pgs. 196-

197), Colored Pencils5. Balancing Equations - 2 pages 4

sides (Bookshelf- Please Staple)6. Today is the End of Quarter #3

…last day to turn in any work for this period of time.

Last Day to:1.Retake Test #22.Retake Quiz #1 – STAR Cards

1-303.Turn in any missing work for

this quarter

Balancing a chemical equations is much like the work of an accountant who has to show where every penny has come from and where it has gone to.

Vocabulary Word

Definition

Inhibitors

Catalysts Starts and/or Speeds Up Chemical Reactions

Stops and/or Slows Down Chemical Reactions

Conservation of Mass

Reactants

Products

Coefficient

Mass (particles) can neither be created or destroyed in any chemical reaction

Word Definition

2 NaOH + H2SO4 Na2SO4 + 2 H2O

Conservation of Mass = the same number of atoms of each element on each side of the equation.

Conservation of Mass

Reactants

Products

Coefficient

Mass can neither be created or destroyed in any chemical reaction.

Substances going into the reaction.

Word Definition

Reactants = the substances going into a reaction

2 NaOH + H2SO4 Na2SO4 + 2 H2O

Conservation of Mass

Reactants

Products

Coefficient

Mass can neither be created or destroyed in any chemical reaction.

Substances going into the reaction.

Substances produced by the reaction

Word Definition

Products = the substances being produced by the reaction

2 NaOH + H2SO4 Na2SO4 + 2 H2O

Conservation of Mass

Reactants

Products

Coefficient

Mass can neither be created or destroyed in any chemical reaction.

Substances going into the reaction.

Substances produced by the reaction

The number in front of the formula indicating how many molecules

Word Definition

Coefficient = The number in front of each formula or element indicating how many molecules

2 NaOH + H2SO4 Na2SO4 + 2 H2O

The Law of Conservation of Mass states that mass is neither created or destroyed in any chemical reaction.

Therefore balancing of equations requires the same number of atoms on both sides of a chemical reaction.

1. Get Yourself an unbalanced equation.

NaOH + H2SO4 Na2SO4 + H2O

1. Get Yourself an unbalanced equation.

2. Draw boxes around all the chemical formulas.

NaOH + H2SO4 Na2SO4 + H2O

3. Make an element inventory.

Element Before After

Na=Sodium 1 2

O= Oxygen 5 5

H= Hydrogen 3 2

S= Sulfur 1 1

NaOH + H2SO4 Na2SO4 + H2O

4. Write the numbers in front of each of the boxes until the inventory for each element is the same both before and after the reaction.

NaOH + H2SO4 Na2SO4 + H2O

Element Before After

Sodium 1 2

Oxygen 5 5

Hydrogen 3 2

Sulfur 1 1

4. Write the numbers in front of each of the boxes until the inventory for each element is the same both before and after the reaction.

NaOH + H2SO4 Na2SO4 + H2O

Element Before After

Na 1 2

O 5 5

H 3 2

S 1 1

2

2

6

4

4. Write the numbers in front of each of the boxes until the inventory for each element is the same both before and after the reaction.

NaOH + H2SO4 Na2SO4 + H2O

Element Before After

Na 2 2

O 6 5

H 4 2

S 1 1

2

4. Write the numbers in front of each of the boxes until the inventory for each element is the same both before and after the reaction.

NaOH + H2SO4 Na2SO4 + H2O

Element Before After

Na 2 2

O 6 5

H 4 2

S 1 1

2 2

6

4

•You have 10 problems to balance… Due Tomorrow

•# 6 on the last page – Start with the (SCN)3 components

•Do TWO and get them checked before you complete them all.

•Ask questions when you don’t understand

HOMEWORK:1. Balancing Equations – Due

Tomorrow

2. STAR CARDS #31-60 – Due Friday

3. Check your updated grades for accuracy ….Last day of the Quarter is Today.