Lesson 3.2 Balancing Equations/Conservation of Mass & Matter

Law of Conservation of Mass & Matter

the principle by which the total value of a physical quantity remains constant in a system which is not subject to external influence.

             Learning Intention: 

What? We are learning to balance chemical equations.

Why?  In order to prove the Law of Conservation of Mass/Matter.

             Success Criteria

I can: 

- Balance chemical equations

- Provide evidence to prove the Law of Conservation of Mass. 

-Create a model to provide evidence as well.

What is a Chemical Reaction? 

Watch the video. 

Fill in boxes 1 & 2

Part 1 Notes on 

Lesson 3.2 Note Sheet.

Observe, Practice, Take Notes

As you work through Slides 5 - 10, 

- Read and PAUSE to answer the questions 

- Also, Fill in the 3rd box                                                                                        on your Note Sheet. 

OBSERVE: What stays constant in this chemical reaction?

31kg

31kg

Proof in Molecules

What stays constant in a chemical reaction?

• The mass stays the same.
• The mass in the reactant & product stay the SAME. 
• This is because NO atoms are added or taken away during a chemical reaction. 

Proof in Molecules

Carbon = 1

Hydrogen = 4

Oxygen = 4

Carbon = 1

Hydrogen = 4

Oxygen = 4

Visualizing Chemical Equations

Visualizing Chemical Equations

Law of Conservation of Mass & Matter

Mass or Matter cannot be created or destroyed in ordinary chemical & physical changes. 

Fill in Box 4

on the note sheet. 

Follow the bracket for each element. 

You will notice the atom for each element is the same amount on BOTH sides of the yield sign.

Fill in box 5

Observe, Practice, Take Notes

As you work through Slides 14 - 19, 

- Read and PAUSE to answer the questions 

- Also, Fill in the 1st box                                                                                        on the BACK of

the Note Sheet. 

00:28

The _____ indicates the number of atoms in a chemical equation.

1. coefficient
2. symbol
3. subscript
4. exponent

00:37

The number in front of the atom (the element symbol) is called the

1. coefficient
2. symbol
3. subscript
4. exponent

00:43

When balancing an equation, the ____ can be changed but the ____ CANNOT be changed.

1. exponent, subscript
2. subscript, coefficient
3. coefficient, subscript
4. coefficient, exponent

Try these on your Practice Section of your notes THEN check your work on the next slide. 

Your Turn: 

On your OWN, do Part 2 Practice on your Note Sheet. 

Have your partner check it. 

Bring it to Mrs. Sorrells to be checked.

Practice Time! 

1. Complete Worksheet: Balancing Act Practice Sheet 

Show ALL work.  Bring sheet to Mrs. Sorrells to check. Make any corrections. Bring back. Move on to next task when approved.

   

Quiz will follow this lesson. Make sure you are understanding as you work. 

CheckPoint

Bring Lesson 3.2 Practice Sheet - Balancing Act to Mrs. Sorrells to be checked. 

Make Corrections. 

Bring back to Mrs. Sorrells.

When approved, move on to the next slide. 

Practice Time! 

Complete wizerme - Lesson 3.2 Practice:  Law of Conservation of Mass & Matter

Remember a Quiz will follow this lesson. Make sure you are ready.