1. Lesson Objective:
You will be able to define and explain what a “pure substance” is.

2. What pieces would be left behind if you destroyed all of this furniture?

3. What would be left behind if you ripped apart this gold?
I use this slide to get students thinking about certain substances and how they are unable to break down into different substances. No matter how much you rip the gold bar apart, it is still going to be gold.

4. What about silver or copper?
I use silver as another example, you could break this bar into a million pieces but it would still be silver.

5. What are “Atoms”?

6. Atom: The smallest unit of matter. Atoms make up EVERYTHING around us.
We are made up of atoms!

7. Do You Recognize These Words?
Hydrogen
Oxygen
Carbon
Helium
Neon
Sodium
Potassium
Nitrogen
Calcium
Aluminum
Gold
Chlorine
Silver
Iron
Fluorine
Krypton

8. Partner Work
I have a periodic table at each desk and have students in pairs examine it to see how many of the known elements they recognize.

9. https://commons.wikimedia.org/wiki/User:Pslawinski

10. Elements Elements make up EVERYTHING in the universe.
There are over 100 known elements on Earth.

11. If this embedded video does not load, the link is https://www. youtube

12. Elements Each element has their own type of atom.
I’m only made up of gold atoms!
I’m only made up of silver atoms!

13. Pure Substances:
Pure substances cannot be broken down into other substances by physical or chemical means.

15. Given the definition, why does it make sense that elements are pure substances?

16. Elements I’m only made up of silver atoms!
I’m only made up of gold atoms!

17. I am a pure substance made up of Copper atoms!

18. What is the smallest unit of matter
What is the smallest unit of matter? A – Element B – Atom C – Compound D – Neutron

19. Pure substance – A – Can only be broken down by chemical means
Pure substance – A – Can only be broken down by chemical means. B – Can only be broken down by physical means. C – Cannot be broken down by physical or chemical means. D – Can be broken down by physical and chemical means.

20. The element helium fills up party balloons. What is helium made up of
The element helium fills up party balloons. What is helium made up of? A – Helium atoms B – Neon atoms C – Helium compounds D – Neon compounds