[8th Grade Science] Understand chemical changes like a puzzle! I created a "Decomposition Model Puzzle App"
Hello.
This time, I created an app that allows you to learn about "chemical changes," which are studied in 8th-grade science, in a fun way, like a puzzle.
In the 8th grade, students learn about the decomposition of sodium bicarbonate, the decomposition of silver oxide, the electrolysis of water, and more.
However, because chemical equations and models of atoms and molecules deal with an invisible world, many students find this unit difficult.
"Wouldn't it be possible to understand chemical changes more intuitively and enjoyably?"
With that thought in mind, I created the
"Decomposition Model Puzzle App" where you can learn while moving atom models yourself.
What kind of app is the "Decomposition Model Puzzle App"?
This is a learning app where you can experience how substances are decomposed and rearranged into new substances by dragging and moving the atom models displayed on the screen yourself.
Instead of just looking at the screen, you can think about chemical changes like a puzzle by separating and combining atoms.
You can use the app here.
https://tyuuri-kagaku-2026.web.app/bunkai/index.html
Here are 4 recommended points!
1. Experience rearranging atoms by moving them with your hands
In this app, you move the atom models yourself to create the substances after decomposition.
For example, in the thermal decomposition of sodium bicarbonate, you think about the substances formed after decomposition while manipulating atom models such as "Na," "H," "C," and "O" on the screen.
By separating atoms and rearranging them into the necessary combinations,
"In a chemical change, the atoms themselves do not disappear; their combinations change."
This becomes easier to understand visually.
2. A sense of accomplishment with the "Decomposition Successful!" display
When you successfully assemble the new substances correctly, the screen displays
"Decomposition successful! The substance has been perfectly separated."
a message like this.
Since you can engage with it like a game rather than just solving problems, you can review in a fun way.
3. Understand the meaning of chemical equations visually
The screen displays not only the decomposition model but also the chemical equation.
For example, in the thermal decomposition of sodium bicarbonate,
Sodium bicarbonate → Sodium carbonate + Carbon dioxide + Water
You can confirm this change along with the model.
Chemical equations, which can feel difficult when seen only as text, become easier to understand when viewed alongside atomic models.
4. Practice difficult reactions repeatedly
In the app, you can choose and learn from the following decompositions.
Decomposition of sodium bicarbonate
Decomposition of silver oxide
Electrolysis of water
You can switch the reaction you want to study just by pressing a button.
"I'm a bit weak at the decomposition of silver oxide"
"I want to check the electrolysis of water again"
When you feel this way, you can redo and practice as many times as you like.
You can use it like this
For example, in the thermal decomposition of sodium bicarbonate, the substances produced after decomposition are:
Sodium carbonate
Carbon dioxide
Water
I will be making this.
By moving the atomic models and thinking about which atoms are used for which substances, the meaning of chemical reaction equations becomes clear.
Also, for the electrolysis of water, there are labels for the cathode and anode, so you can learn while visualizing the experiment.
Making invisible chemical changes visible
Chemical changes occur in the world of tiny, invisible atoms and molecules.
Because of this, it can be difficult to visualize them using only textbook diagrams or chemical reaction equations.
However, when you move the models yourself,
"The number of atoms does not change"
"The combinations change, resulting in different substances"
"Chemical reaction equations represent the rearrangement of atoms"
These concepts become much easier to understand.
Recommended for test preparation and class review
This app is perfect for learning about chemical changes in the second year of junior high school.
It can be used for previewing or reviewing lessons, and for checking before tests.
Teachers can also use it for classroom demonstrations or as a summary after experiments.
I think even students who struggle with chemical changes can learn happily as if they were playing a puzzle.
Please try using it at least once.
App is here
You can use the "Decomposition Model Puzzle App" here.
https://tyuuri-kagaku-2026.web.app/bunkai/index.html
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