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Warm Up
Copy the following text onto page 7:
The idea of atoms and a balanced chemical equation support the
law of conservation of mass. The law can be observed when the
reaction takes place in a closed container.
talk to the text you just copied
Date
Session
#
Activity
Page
#
11/9-10
5
What difference does a container make?
7
Conservation of mass text sets
8
Homework:
Complete worksheet
Retest is Monday Morning 8am
8.P.1 Understand the physical properties of matter
and changes that occur when matter interacts in an
open or closed container
8.P.1.4 Explain how the idea of atoms and a balanced
chemical equation support the law of conservation of
mass
TLW analyze various text, then explain how
these texts explain the law of conservation
of mass/matter.
Discuss with your seat partner…
What is matter?
What are the different states of matter?
What is the evidence that a substance is a solid?
Liquid? Gas?
What difference might a container make?
Answer in compete sentences on p 7
1. What is the difference between an open and a
closed container?
2. How does a solid act in a closed container vs. an
open container?
3. How does a liquid act in a closed container vs. an
open container?
4. How does a gas behave in a closed container vs.
an open container?
Demonstration
CO2 (s)  CO2 (g)
-57 °C ( -71 °F )
Boiling Point of Carbon Dioxide
Describe the demonstration in your notebook (p7).
Include your observations about matter interactions in an
open vs closed container.
CO2 + H2O --> H2CO3 --> H+ + HCO3- making the solution acidic.
Sublimation: The transition of a substance directly from the solid to the gas phase without
passing through an intermediate liquid phase.
Law of Conservation of Mass/Matter
text set
Inquiry Question p8:
How does the arrangement of atoms before and
after they interact explain the Law of
Conservation of Mass/Matter?
This question should guide your reading of each
text.
Start with the evidence, then move
to interpretations
Read and talk to text p7
1. What is the gist (main idea) of the article?
2. What is a Golden Line from the text that
connects to today’s inquiry question:
How does the arrangement of atoms before and
after they interact explain the Law of Conservation
of Mass/Matter?
3. Explain why you selected that as your
“Golden Line.”
Video Clip
• We will watch the video two times. The first time
through, no notes, just pay attention to the clip. Do not
discuss with your neighbor.
• The second time you view the clip, jot down
EVIDENCE you gathered from watching the video.
Pay attention to the state of matter of the
substances, changes (?), open/closed container,
etc.
https://edpuzzle.com/classes/54ebde74b9cdd76842cd0512
Share evidence with your elbow partner, then your table grouping
Share out with class
Compare & contrast the two representations of the equation
Diagram 1
Compare & contrast the two representations of the equation
Diagram 2
Matter Interaction:
vinegar + Sodium Bicarbonate (Baking Soda)
Mass of system before reaction
Mass of system after reaction
NaHCO3(s) + C2H3O2H(aq) ➜ H2O(l) + CO2(g) +C2H3O2Na(aq)
Lab
1. Measure 20 ml of vinegar into your graduated cylinder
2. Carefully place the balloon on the cylinder WITHOUT
EMPTYING THE CONTENTS OF THE BALLOON INTO THE
CYLINDER
3. Carefully measure the mass of the cylinder-balloon
apparatus. Record mass on your text sheet
4. Carefully lift the balloon so the contents empty into the
cylinder
5. Measure the mass of the apparatus at the end of the
experiment…record on your text sheet
Lab
1. Measure 20 ml of vinegar into your graduated cylinder
2. Carefully place the balloon on the cylinder WITHOUT
EMPTYING THE CONTENTS OF THE BALLOON INTO THE
CYLINDER
3. Carefully measure the mass of the cylinder-balloon
apparatus. Record mass on your text sheet
4. Carefully lift the balloon so the contents empty into the
cylinder
5. Measure the mass of the apparatus at the end of the
experiment…record on your text sheet
Conservation of Mass
Matter is not created or destroyed.
The mass of reactants is equal to the
mass of products.
How does the arrangement of atoms before
and after they react explain the Law of
Conservation of Mass/Matter?