Lesson 69 of 84 · Chemical Reactions
Lesson⭐ 30 XP🧪 Potion KitchenAlloys: Metal Mixtures (Part 2)
Chemical Reactions.
🎯 Your mission
Master the concept. Use it tomorrow.
⚡ The twist
Color changes mean atoms are rearranging — even if you can't see them.
Mind = Blown
🧪 If you could remove all the empty space from atoms, the entire human race would fit in a sugar cube.
Make a hypothesis first
Before you mix: what color do you think it'll turn?
What You'll Learn
An alloy is a mixture of a metal with one or more other elements. Steel is iron blended with carbon, and bronze combines copper and tin, giving them greater strength than the pure metals.
Key Words
Tap a word to see its definition.
Steps
Review the background information on Chemical Reactions before starting.
Separate a mixture of sand, salt, and iron filings using a magnet, water, and a filter. Record each step and what you separated.
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 an example of a chemical change?
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
Get the full Chemical Reactions track as a printable PDF — all lessons, worksheets, and answer keys.