1. Law of Conservation of Mass
SPI
Law of Conservation of Mass
Notes
Science
Bellwork:
Write the definition for “law of conservation of mass” in your notebook
Law of conservation of mass-the law states that mass cannot be created or destroyed in a chemical reaction

2. SPI
Law of Conservation of Mass
Notes
Science
Tennessee SPI Objective:
Recognize that in a chemical reaction the mass of the reactants is equal to the mass of the products.
(Law of Conservation of Mass: LOCOM)
Learning Target
I know that the reactants and products have to be equal on both sides of a chemical equation.
Success Criteria
I can correctly judge if an equation follows the law of conservation of mass.

3. Law of Conservation of Mass
SPI
Law of Conservation of Mass
Notes
Science D3
I’ll roll the dice-you follow the directions!
1-2 Draw It
3-4 Demonstrate It
5-6 Describe It
Words to choose from:
Atom Element
Compound Chemical Symbol Chemical formula

4. Law of Conservation of Mass
SPI
Law of Conservation of Mass
Notes
Science

5. Law of Conservation of Mass
SPI
Law of Conservation of Mass
Notes
Science
Dr. Ralston has been found in violation of the law of conservation of mass!!!!!
Discuss with your partner the ways she violated the law of conservation of mass.

6. Law of Conservation of Mass Key Points About All Chemical Reactions
SPI
Law of Conservation of Mass
Notes
Science
Key Points About All Chemical Reactions
You start with reactants …you end up with products
Reactants are the "ingredients" and products are what are formed during the reaction.
No atoms are created or destroyed during chemical reactions
So no mass is
created or destroyed
This is called the
Law of
Conservation of Mass
LOCOM

7. Law of Conservation of Mass
SPI
Law of Conservation of Mass
Notes
Science
Key Topic
Chemical symbols
These are the symbols (letters) that represent the elements from the periodic table.
Each element's chemical symbol starts with one capital letter
H is a chemical symbol (for the element hydrogen)
O is a chemical symbol (for the element oxygen)
Fe is a chemical symbol (for the element iron)
Na is a chemical symbol (for the element sodium)
Examples:

8. Law of Conservation of Mass
SPI
Law of Conservation of Mass
Notes
Science
Key Topic
Chemical Formulas
chemical formulas
Chemical symbols combined together =
Example:
Put the symbols H (hydrogen) and O (oxygen) together…
…and you get the formula for water… H2O
Example:
Put the symbols Na (sodium) and Cl (chlorine) together…
…you get the formula for sodium chloride… NaCl

9. Law of Conservation of Mass
SPI
Law of Conservation of Mass
Notes
Science
Key Topic
Chemical Equations
Chemical formulas combined together =
chemical equations
Examples:
Equation: 2H2 + O H2O
Equation: 2Na + Cl NaCl

10. Law of Conservation of Mass
Quick Review
SPI
Law of Conservation of Mass
Science
Key Topics
To follow the law of conservation of mass, a chemical equation MUST have the same chemical symbols (elements) on both sides of the equation.
C+O CO₂

11. 2H2 + O2 2H2O Science Key Topics Quick Review
SPI
Law of Conservation of Mass
Science
Key Topics
2H2 + O H2O
Does it follow the law of conservation of mass?

12. O2 + He2 2H2O Science Key Topics Quick Review
SPI
Law of Conservation of Mass
Science
Key Topics
O2 + He H2O
Does it follow the law of conservation of mass?

13. Law of Conservation of Mass
Quick Review
SPI
Law of Conservation of Mass
Science
Exit Ticket
Do these formulas follow the law of conservation of mass? How do you know?
H + O OH
PbNa+HOH PbOH+NaH
COHe COH
NeAr+Mg Ar
NaCl CHO