Reading Chemical Formulas

Lab Brief #4

🎯 Your mission

Understand the idea. Then look for it everywhere.

⚡ The twist

Mixing two safe things doesn't always make a safe thing.

What you'll learn

Chemical formulas show the types and numbers of atoms in a molecule. CO₂ has one carbon and two oxygen atoms. The subscript tells how many of each atom.

Key words

atom
The tiny building block that makes up everything around us.
chemical bond
The force that holds atoms together to make a substance.
molecular formula
A set of symbols showing which atoms make up a molecule.

Make a hypothesis first

Predict: will the mixture get hotter, colder, or stay the same?

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

Build a model of an atom using craft supplies. Show protons, neutrons, and electrons in the correct arrangement. Label each particle.

Step 3 of 4 · Observe

Note any unexpected results and think about why they happened.

Step 4 of 4 · Record

Share your findings with the class or a partner and discuss what you learned.

Question 1 of 3

What is the chemical formula for water?

How sure are you?😐 maybe

Question 2 of 3

What holds atoms together in a molecule?

How sure are you?😐 maybe

Question 3 of 3

What is a solution?

How sure are you?😐 maybe

Mind = blown

🌈 Every color you see is your brain inventing a translation of light frequencies.

Nice work!

You got 0 of 3 right.

Next: The Law of Definite Proportions All lessons

🎯

Next Smart Experiment

We'll pick an experiment that matches exactly how you're thinking right now.

✨ 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?”

🧪Share card

Share this experiment

Send it to a parent who's looking for a 10-minute kitchen science win.

Reading Chemical Formulas

Next Smart Experiment

Share this experiment

Reading Chemical Formulas

Done with science? Try something else

Your Cart (0)