Law of Conservation

Law of Conservation of Mass

10/11/21

​Bell Ringer (Write and answer on Page 23)

​How can someone determine if a chemical equation is balanced?

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A. ​The coefficients must be equal on both sides of the equation

B. The number of atoms of each element in the reactants must be higher 

C. The number of atoms of each element must be equal on both sides of the equation

D. The number of atoms of each element in the products must be higher

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Multiple Choice

How can someone determine if an equation is balanced? 

• The coefficients must be equal on both sides of the equation

• The number of atoms of each element in the reactants must be higher

• The number of atoms of each element must be equal on both sides of the equation

• The number of atoms of each element in the products must be higher

​Today We Will...

1. ​Bell Ringer (Pg 23)

2. ​Copy I Can Statement (Pg 24)

3. ​Review Balancing Equations

4. ​Intro to Balancing Equations Worksheet

5. ​Law of Conservation of Mass Notes

6. ​Concept Questions

7. ​Law of Conservation of Mass Brainpop

​I Can Statement (Pg 24)

​I can explain and apply how the idea of atoms and a balanced chemical equation support the law of conservation of mass

​Review-Balancing Equations (Pg 24)

Poll

Identify if the following equation is unbalanced or balanced.

4K+P₃→3KP+K

• Unbalanced

• Balanced

​Notes (pg 24)

Law of Conservation of Mass

This is the scientific principle that matter is neither created or destroyed during a chemical change. Basically, what you start with, you have to end with. That is why atoms have to be equal on both sides of the equation.​

Poll

​Chemical X has a mass of 5 grams and chemical Y has a mass of 10 grams. if the two chemicals are mixed and a complete chemical reaction takes place what will most likely be the mass of the products?

• 5 grams

• 10 Grams

• 15 grams

• 50 grams

Multiple Choice

In which of the following equations is the law of conservation of mass supported? 

• 4P₂ + 10O₂ --> 2P₂O₅

• SO₂ + O₂ --> S₂O₅

• 2Al +3HCl --> 2AlCl₃ +3H₂

• 2H₂O --> 2H₂+O₂

Multiple Choice

According to the law of conservation of mass the total mass of the products of a chemical reaction ____ the total mass of the reactants.

• is greater than

• is less than

• is the same as

• may be more or less than

Multiple Choice

Matter cannot be ____ during a chemical reaction.

• Created 

• Destroyed

• Changed 

• Created or Destroyed 

​Law of Conservation of Mass Brainpop

​1. Log into rapid identity

​2. Click on Clever (Login with Google)

​3. Click on Brainpop

​4. Click on Notifications at the top

​5. Complete the Assignment Conservation of Mass

​ -Watch the video and fill in your half sheet

​ -Complete the Quiz