Bath bomb Observation
What happened when a bath bomb was added to water?
Gas bubbles formed and the bomb broke apart.
What did we test in an open vs. closed system?
The bath bomb reaction mass.
What are the main ingredients in a bath bomb?
Citric acid and baking soda.
What test did we use to check flammability? The ____ Test
The flame test (see if flame goes out).
What is a chemical reaction?
When atoms rearrange to make new substances.
What did the gas bubbles tell us?
A new substance formed — a chemical reaction occurred.
What did we find when the lid was closed?
The mass stayed the same — gas didn’t escape.
What happens when each ingredient is added to water alone?
Nothing — no gas bubbles form.
What happened when gas from the bath bomb met a flame?
The flame went out.
What are physical properties used for?
Identifying substances.
What did some students think happened to the matter?
Some thought it disappeared; others thought it changed form.
What does that mean about the gas?
It was made from matter already in the system.
What happens when citric acid and baking soda mix with water?
They react and make bubbles (CO₂ gas).
What did the flame test tell us?
The gas is nonflammable.
What happens to total mass in a closed system?
It stays the same.
What question guided our next investigation? (Think about the bath bomb)
Where is the gas coming from?
What property helped prove the gas wasn’t trapped?
No change in mass when sealed.
What kind of change makes a new substance?
A chemical reaction.
What property helped us compare gases? We compared it to air
Density.
Name two clues of a chemical change.
Gas production, color change, odor, or temperature change.
What kind of phenomenon is a bath bomb fizzing?
Chemical Reaction or Chemical Change
What scientific concept did we confirm? Conservation of __________
Conservation of mass.
What do we call something that describes how a substance behaves (like solubility, color, smell or density)?
A property.
What gas matched all the test results?
Carbon dioxide (CO₂).
What’s the unit question for this unit?
“How can we make something new that was not there before?”