Signs of a Chemical Change

Lab Brief #8

🎯 Your mission

Understand the idea. Then look for it everywhere.

⚡ The twist

If it bubbles, something invisible is escaping.

What you'll learn

Chemical changes produce new substances with different properties. Signs of a chemical change include color change, gas production, temperature change, and formation of a precipitate.

Key words

physical change
A change in how matter looks without making a new substance.
chemical change
When matter turns into a new substance, like wood burning.
temperature
How hot or cold something is.

Make a hypothesis first

Guess: will the fizz be loud, soft, or none at all?

Say your guess out loud — then find out if you were right.

Step 1 of 4 · Read

Look at the vocabulary words and write a definition for each in your own words.

Step 2 of 4 · Do

Heat ice and record the temperature every minute as it melts and then boils. Graph the temperature changes and label each phase change.

Step 3 of 4 · Observe

Draw a detailed diagram of what you observe.

Step 4 of 4 · Record

Write a conclusion: what did your results show? Did they match your prediction?

Question 1 of 3

Which is a sign of a chemical change?

How sure are you?😐 maybe

Question 2 of 3

What makes a physical change different from a chemical change?

How sure are you?😐 maybe

Question 3 of 3

Which is an example of a chemical change?

How sure are you?😐 maybe

Mind = blown

🧪 If you could remove all the empty space from atoms, the entire human race would fit in a sugar cube.

Nice work!

You got 0 of 3 right.

Next: Types of Mixtures All lessons

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✨ More to explore

🌍 Where you see this in real life: Your toothpaste, your soap, even your breakfast involves this.

🏆 Stretch challenge (try it 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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