Lesson 49 of 84 · Chemical Reactions
Experiment⭐ 30 XP🧪 Potion KitchenMolecules and Compounds (Part 2)
Chemical Reactions.
🎯 Your mission
Set it up. Test it. Be amazed.
⚡ The twist
Mixing two safe things doesn't always make a safe thing.
Mind = Blown
🌈 Every color you see is your brain inventing a translation of light frequencies.
Make a hypothesis first
Predict: will the mixture get hotter, colder, or stay the same?
What You'll Learn
Molecules form when two or more atoms bond together. A water molecule has two hydrogen atoms bonded to one oxygen atom, written as H₂O.
Key Words
- molecular formula
- pH
Materials Needed
- cups
- spoons
- food coloring
- plastic bottles
- balloons
Safety First
- Do not taste any materials.
- Wear safety goggles when mixing liquids.
Steps
Review the background information on Chemical Reactions before starting.
Mix baking soda and vinegar in a sealed bag. Weigh the bag before and after. Did the mass change? Explain why or why not using the law of conservation of mass.
Note any unexpected results and think about why they happened.
Share your findings with the class or a partner and discuss what you learned.
Check Your Understanding
Question 1
1 of 3What is the smallest unit of an element?
Where you see this in real life
This is happening in your kitchen right now — every time food cooks.
Stretch Challenge
Try this in real life this week.
Find one ingredient in a snack and look up what it does.
For the dinner table
“What's something we cook that mixes things together this way?”
Next Smart Experiment
We'll pick an experiment that matches exactly how you're thinking right now.
Share this experiment
Send it to a parent who's looking for a 10-minute kitchen science win.
Checkout complete lesson on Chemical Reactions for 7th Grade
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