Lesson 4 mixture and substance

educational purposes

1. Mixtures and Pure Substance Can You See The Phases?

2. What is a pure substance ?

3. Pure Substance A substance in which there is only one type of particle. The particles of a pure substance are alike no matter where they are found. Ex: Particles of iron in a skillet are the same as the iron particles found in a meteorite

4. Element Is a pure substance that cannot be separated into simpler substances by physical or chemical means. It only has one type of atom.

5. Compounds A pure substance composed of two or more elements that are chemically combined. Salt- Sodium & Chlorine Water- hydrogen & oxygen Sugar- carbon, hydrogen & oxygen Baking soda- sodium, hydrogen, carbon, and oxygen.

6. Compounds aren't Random The elements that make up a compound join in a specific ratio according to their masses. Water 2 atoms of hydrogen to 1 atom of oxygen (2:1 ratio) 1g hydrogen to 8g oxygen = 1:8 = 1/8 Each compound has its own set or identifying properties different from the elements that it is formed from.

7. A mixture is made of 2 or more types of atoms that are NOT chemically combined together. What Is A Mixture? Mixtures can take many forms: 2+ Solids 2+ Liquids 2+ Gases ANY combination of solids, liquids & gases

8. Mixtures of Solids

9. Mixtures of Liquids

10. Mixtures of Gases

11. You can see the different parts (phases) of the mixture easily Types Of Mixtures There are 2 major types of mixtures: Heterogeneous Homogeneous Means “ different ” Means “ the same ” You cannot see the different parts (phases) of the mixture

12. Heterogeneous Mixtures

13. Homogeneous Mixtures

14. Which Kind of Mixture? Classify each type of mixture as: Heterogeneous Homogeneous Heterogeneous Heterogeneous Homogeneous

15. Any Questions?