1. Topic: Chemical Formulas
Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?

2. Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Chemical formulas Are written using an elements chemical symbol from the periodic table Used to identify how many atoms of each element are present

3. H20 Chemical formula for water
Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Chemical formula for water
H20
Subscript- tells you how many atoms per element there are
There are 2 Hydrogen atoms and 1 Oxygen atom in water

4. 3H20 Chemical formula for water
Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Chemical formula for water
3H20
Coefficient- tells you how many molecules there are
There are 3 molecules of water

5. 3H20 Chemical formula for water
Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Chemical formula for water
3H20
Coefficient- you multiply the coefficient by the subscript to get the number of atoms per element
There are 6 hydrogen atoms and 3 oxygen atoms

6. Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Law of conservation of mass
During a chemical reaction, no matter is created or destroyed, it is just rearranged
2H2 + O2  2H2O 
The chemical equation is balanced H H H H O H H O O O H H

7. 1.) Take an element inventory for each side of the equation
Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
How to see if a chemical equation is balanced
2H2 + O2  2H2O
1.) Take an element inventory for each side of the equation
2.) Write down the number of atoms for each element
3.) If the numbers match, then it is balanced
H - H- O- 4 4 2 2

8. Now take some time…
Take 2 minutes to go over your notes and highlight or underline the main ideas that answer the essential question, you should not highlight everything:
Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?

9. Time to use the left hand column
You will be writing your own questions from now on!
To get you started, verbs will be provided

10. Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Chemical formulas Are written using an elements chemical symbol from the periodic table Used to identify how many atoms of each element are present
Choose one verb to write your question:
Define
Describe
Compare
Explain

11. H20 Chemical formula for water
Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Chemical formula for water
H20
Subscript- tells you how many atoms per element there are
There are 2 Hydrogen atoms and 1 Oxygen atom in water
Choose one verb to write your question:
Define
Describe
Compare
Explain

12. 3H20 Chemical formula for water
Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Chemical formula for water
3H20
Coefficient- tells you how many molecules there are
There are 3 molecules of water
Choose one verb to write your question:
Define
Describe
Compare
Explain

13. 3H20 Chemical formula for water
Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Chemical formula for water
3H20
Coefficient- you multiply the coefficient by the subscript to get the number of atoms per element
There are 6 hydrogen atoms and 3 oxygen atoms
Choose one verb to write your question:
Define
Describe
Compare
Explain

14. Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
Law of conservation of mass
Choose one verb to write your question:
Define
Describe
Compare
Explain
During a chemical reaction, no matter is created or destroyed, it is just rearranged
2H2 + O2  2H2O 
The chemical equation is balanced H H H H O H H O O O H H

15. 1.) Take an element inventory for each side of the equation
Topic: Chemical Formulas Essential Question: What is the law of conservation of mass, and how does it apply to chemical equations?
How to see if a chemical equation is balanced
2H2 + O2  2H2O
1.) Take an element inventory for each side of the equation
2.) Write down the number of atoms for each element
3.) If the numbers match, then it is balanced
Choose one verb to write your question:
Define
Describe
Compare
Explain
H - H- O- 4 4 2 2

16. Time to use the left hand column
You will now write questions on your own using question starters that are provided

17. Now let’s write a summary
Look at each question you wrote on your own, and answer each question in a complete sentence.