1. Chapter 9.3 Part 1 Q: What is the dullest element? A: Bohrium

2. Key concepts: Describe 3 properties of mixtures Describe 4 methods of separating mixtures Give everyday examples of mixtures

3. Key Vocabulary: Mixture Concentration Solubility Suspension Colloid Solvent Solute Solution

4. Imagine a world of legos: Make up compounds and mixtures:

5. Mixtures: A mixture is a combination of two or more substances that are not chemically combined. How are mixtures different from compounds? – They form a mixture when they don’t chemically react like a compound Think about trial mix or a pizza… – Can you taste the tomato pasta? Meat? What does pure mean? How is this different from an compound? What are some examples of chemical and physical changes?

6. SAY WHAT! What does it mean to not be chemically combined? – Example? – When you do chemically combines it, what happens? – Why do mixture’s substances keep their individual properties while compounds don’t? How many atoms are in the following samples? – CaCO 3 – C 6 H 12 O 6 – NaCl

7. Got to keep them separated! You can separate mixtures physically. – What about compounds? When discussing ratios of elements that make up mixtures, it is not definite, like compounds Know figure 1 on page 244

8. Quick Questions: Infer – How does separating blood into several layers in a centrifuge show that blood is a mixture instead of a pure substance?

9. Demonstration time: How can I separate these? – What do you think? – What would you do? Can all mixtures be separated easily? – “Chemicals can form mixtures, but no chemical change happens when a mixture is made. That means that each chemical keeps its original identity. The pepperoni and olives on the pizza don’t change when they are mixed. Making a mixture is a physical change.” HYPOTHESIS

10. Compound vs. Mixture! What are some similarities and differences between compounds and mixtures? Compounds: Mixtures:

12. Quick question: How is the ratio of components in a mixture different from the ratio of elements in a compound?

13. What mixtures do you know of? You are surrounded by mixtures. Mixtures make up the food you eat, the school supplies you use, and the clothes you wear. AND MOST IMPORTANTLY…US! What have you seen or heard of? You are surrounded by mixtures. Mixtures make up the food you eat, the school supplies you use, and the clothes you wear. AND MOST IMPORTANTLY…US! What have you seen or heard of?

14. Review: How do mixtures differ from elements and compounds? How can mixtures be separated?

15. Homework: Vocabulary cards for the following term: – Mixture Vocabulary cards for the following term: – Mixture Q-tips says, “Q: Why do chemists call helium, curium and barium the medical elements? A: Because if you can't helium or curium, you barium!