Conservation of Mass

Launch Question

Multiple Choice

Which student claim best describes what is happening to the mass of the system when the chemical reaction occurs in the model?

• Susan: "The mass of the system will decrease, because ash is smaller in size than the logs and fire."

• Lisa: " The mass of the system will increase, because new atoms are created when the gas forms from the fire."

• James: " The mass of the system will remain the same, because matter isn't created or destroyed, only change form in the chemical reaction.

• Colton: "The mass of the system will decrease, because the fire destroys atoms."

A system is a collection of components that work together as a whole.


Example:
Digestive system

​Parts: mouth, stomach, small intestines, large intestines
Function: All work together to break down food

What is a system?

How is this model a system?

• Matter does not interact with its surroundings.

• Matter is contained.

Closed System

• Matter interacts with it's surroundings.

• Matter can be transferred in and out.

Open System

System (Open vs. Closed)

Open vs Closed System?

Midpoint Checkpoint

Multiple Choice

Which student claim best describes what is happening to the mass of the system when the chemical reaction occurs in the model?

• Susan: "The mass of the system will decrease, because ash is smaller in size than the logs and fire."

• Lisa: " The mass of the system will increase, because new atoms are created when the gas forms from the fire."

• James: " The mass of the system will remain the same, because matter isn't created or destroyed, only change form in the chemical reaction.

• Colton: "The mass of the system will decrease, because the fire destroys atoms."

Open Ended

What evidence supports the claim that you picked in the previous question?

End of Lesson Checkpoint

Success Criteria:

• I can use a model to describe the law of conservation of matter.

• I can calculate the total mass of a chemical reaction.

Multiple Choice

Does this model of a chemical reaction support the Law of Conservation of Mass?

• Yes

• No

Evidence

On the paper given to you mathematically show your evidence to support your claim to the previous question.