Lesson 27 of 84 · Properties of Matter
Lesson⭐ 30 XP🧪 Potion KitchenPhase Changes in Everyday Life
Properties of Matter.
🎯 Your mission
Master the concept. Use it tomorrow.
⚡ The twist
Mixing two safe things doesn't always make a safe thing.
Mind = Blown
💧 Hot water can freeze faster than cold water under the right conditions. Nobody fully understands why.
Make a hypothesis first
Predict: will the mixture get hotter, colder, or stay the same?
What You'll Learn
The law of definite proportions states that a compound always contains the same elements in the same ratio by mass. Water is always 11.2% hydrogen and 88.8% oxygen.
Key Words
- temperature
- melting point
- freezing point
Steps
Look at the vocabulary words and write a definition for each in your own words.
Create a density column: carefully layer honey, dish soap, water, vegetable oil, and rubbing alcohol in a tall glass. Drop small objects in to test where they float.
Compare the before and after states.
Write your conclusion: did the results match your hypothesis? What would you change next time?
Check Your Understanding
Question 1
1 of 3Which is a sign of a chemical change?
Where you see this in real life
Your toothpaste, your soap, even your breakfast involves this.
Stretch Challenge
Try this in real life this week.
Ask a grown-up to help you mix two safe kitchen things. Predict what will happen first.
For the dinner table
“What's something we cook that mixes things together this way?”
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