Today’s Agenda…10-22

1. Today’s Agenda…10-22 • Bellringer: Corrections to last week’s bellringers. If you were absent last week and have not turned this in, see me. • Review • Compounds vs. Mixtures • Turn in baby books tomorrow

2. What do you think? • True or False (Review questions) • Elements cannot be broken into simpler substances. • Compounds are made up of two or more atoms of the same element. • Water is an example of a compound. • Salt is an example of an element.

3. Compounds vs. Mixtures • Compounds and Mixtures are not the same type of substance! • Today we will investigate the difference between these two substances. • We will investigate… • Their composition • How they are joined • If and how they can be separated • Their properties • Examples

4. Composition • Mixture • Varies • You can change the amount of each substance in a mixture • Compound • Definite • You cannot change the amount of each element in a compound

5. Joined • Mixture • A physical change occurs when substance come together • The substances are NOT chemically joined together • Compound • A chemical change occurs when substance come together • The substances are chemically joined together

6. Separation • Mixture • Each substance is easily separated from the mixture • Sorting, sifting, filtering, evaporation • Compound • Can only be separated into elements using chemical reactions

7. Properties • Mixture • Each substance keeps its own properties • Compound • The compound has different properties than the elements it contains

8. Examples • Mixture • Air • Salt water • Soup • Compound • Water • Salt • Carbon dioxide

9. Chex Mix vs. Salt Water • What is the difference? • Which one is easier to separate? • Chex mix is a heterogeneous mixture while salt water is a homogenous mixture or solution

10. Homogeneous vs. Heterogenous • Homogeneous mixture - “the same throughout”, meaning you cannot see the different parts in the mixture, like salt water or air • Heterogeneous mixture – you can see the different parts in the mixture, like pizza and vegetable soup

11. What did you learn? • True or False? If false, what would make it true? • Mixtures cannot be separated. • A physical change occurs when compounds are formed. • The elements in a compound keep their original properties. • You can see all the parts in a homogeneous mixture.

12. Homework • Edit writes frames on compounds and mixtures. This should be on a separate sheet of paper. • Turn in tomorrow! • Baby books also due tomorrow!