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Where is the gas coming from?
Lesson Objectives...
Collaboratively plan and carry out an investigation in a closed system to answer the question, “Where does the gas produced by the bath bomb come from?”
Construct and present an oral and written argument supported by empirical evidence and scientific reasoning to support the claim that gas is not trapped in the bath bomb to start with but must come from some change to the matter that was already in the system to begin with.
Resources for Lesson 2...
Resources for Lesson 2...
Store Bought Bath Bomb
Store Bought Bath Bomb
Record your observations in your science notebook.
Recipe A Bath Bomb
Recipe A Bath Bomb
Record your observations in your science notebook.
Recipe B Bath Bomb
Recipe B Bath Bomb
Record your observations in your science notebook.
Recipe C Bath Bomb
Recipe C Bath Bomb
Record your observations in your science notebook.
Recipe D Bath Bomb
Recipe D Bath Bomb
Record your observations in your science notebook.
Crushing a Bath Bomb
Crushing a Bath Bomb
Watch the video of the lab completed for you. What happens when a bath bomb is crushed? Is the gas located between the ingredients in the bath bomb? What happens to the mass in the closed system? What happens to the mass in the open system?
Adding Water to a Bath Bomb
Adding Water to a Bath Bomb
Watch the video of the lab completed for you. What happens when water is added to a bath bomb? Is the gas something new made from the ingredients in the bath bomb? What happens to the mass in the closed system? What happens to the mass in the open system?
Evidence from our Investigation...
Evidence from our Investigation...
The gas is part of the bath bomb already - trapped inside it.
Our evidence does not support this claim.
The gas is something new, made from the bath bomb and water.
Our evidence supports the claim that the gas is not new matter, but something already in the bath bomb and water.
Key Science ideas...
Key Science ideas...
Gases, liquids, and solids are all matter.
Matter has mass and takes up space.
All matter is made of particles.
In a closed system, no matter can get in or out, so the mass stays the same...even when changes happen to the matter (such as becoming a gas).
In an open system, matter can get in or out, so the mass can change if that happens.
What we figured out this lesson...
What we figured out this lesson...
The gas we observed from the bath bomb does not come from any gas that was originally trapped in the bath bomb itself.
Instead, the gas we observed when the bath bomb was placed in water comes from some change to the matter that was already there to begin with.
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