Topic: Chemical Formulas

Essential Question: What is the law of conservation of mass, and how does it apply

to chemical equations?

Topic: Chemical FormulasEssential 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

Topic: Chemical FormulasEssential 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

Topic: Chemical FormulasEssential 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

Topic: Chemical FormulasEssential 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

During a chemical reaction, no matter is created or destroyed, it is just rearranged 2H2 + O2 2H2O

+

The chemical equation is balanced

H

H O

OH

HO O

H HHH

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

Law of conservation of mass

Topic: Chemical FormulasEssential 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 equation2.) Write down the number of atoms for each element3.) If the numbers match, then it is balanced

H - H-

O- O-

4

22

4

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?

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

Topic: Chemical FormulasEssential 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:

DefineDescribeCompareExplain

Topic: Chemical FormulasEssential 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:

DefineDescribeCompareExplain

Topic: Chemical FormulasEssential 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:

DefineDescribeCompareExplain

Topic: Chemical FormulasEssential 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:

DefineDescribeCompareExplain

During a chemical reaction, no matter is created or destroyed, it is just rearranged 2H2 + O2 2H2O

+

The chemical equation is balanced

H

H O

OH

HO O

H HHH

Topic: Chemical FormulasEssential 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:

DefineDescribeCompareExplain

Topic: Chemical FormulasEssential 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 equation2.) Write down the number of atoms for each element3.) If the numbers match, then it is balanced

H - H-

O- O-

4

22

4

Choose one verb to write your question:

DefineDescribeCompareExplain

Time to use the left hand column

• You will now write questions on your own using question starters that are provided

Now let’s write a summary

Look at each question you wrote on your own, and answer each question in a complete sentence.