1. A Matter of Fact Mixtures, Elements and Compounds

2. Let’s see what you already know from previous lessons…… Discussion 1. Is air only made up of O? 2. What is matter? 3. What is mass? 4. What are the four states of matter?

3. Let’s see how much you remembered…. 1. No, it is also composed of other gases; such as, N,C, and other gases. 1. No, it is also composed of other gases; such as, N,C, and other gases. 2.Anyting that takes up space. 2.Anyting that takes up space. 3. Amount of matter. 3. Amount of matter. 4. Solid, Liquid, Gas, and Plasma. 4. Solid, Liquid, Gas, and Plasma.

4. Lesson Objective Compose the right questions to ask when identifying matter. Compose the right questions to ask when identifying matter. Distinguish between an element, compound, and a mixture. Distinguish between an element, compound, and a mixture. Define a heterogeneous mixture and give an example. Define a heterogeneous mixture and give an example. Define a homogenous mixture and give an example. Define a homogenous mixture and give an example.

5. Mixtures, elements, compounds All matter can be classified as mixtures, elements and compounds. All matter can be classified as mixtures, elements and compounds.

6. First, we must understand what the terms mean… Element- only one kind of atom. Element- only one kind of atom. Ex. O- is only oxygen Ex. Fe- is only Iron Do not write question (class discussion) *Can you think of another element that is only made up of one atom we discussed in past lessons?

7. Compound- is two or more different elements combined. Compound- is two or more different elements combined. Ex. H2O-Water Ex. H2O-Water Ex. NaCl-Salt (Sodium Chloride) Ex. NaCl-Salt (Sodium Chloride) Do not write question (class discussion) Do not write question (class discussion) *Can you think of another compound that is only made up of two or more different elements we discussed in past lessons? *Can you think of another compound that is only made up of two or more different elements we discussed in past lessons?

8. Mixture- two or more substances that are not chemically combined with each other and can be separated by physical means. Mixture- two or more substances that are not chemically combined with each other and can be separated by physical means.

9. Why isn’t it a good idea to classify matter by its phases? Because one kind of substance can exist in more than one phase – such as H 2 0. And matter changes phases rather easily. Because one kind of substance can exist in more than one phase – such as H 2 0. And matter changes phases rather easily.

10. Why isn’t matter classified according to its physical characteristics, such as color? Why isn’t matter classified according to its physical characteristics, such as color? Scientists wouldn’t find it very useful to group gold, sunflowers, and the sun together. Scientists wouldn’t find it very useful to group gold, sunflowers, and the sun together.

11. Scientists ask themselves these questions? Is the matter uniform throughout? Is the matter uniform throughout? Can it be separated by physical means? Can it be separated by physical means? Can it be separated by chemical means? Can it be separated by chemical means?

12. By asking these questions scientists can classify matter: Today’s lesson will focus on classifying matter as a mixture.

13. Is it uniform throughout? If the answer is no, the matter is a heterogeneous mixture. If the answer is no, the matter is a heterogeneous mixture. Does not appear to be the same throughout. Does not appear to be the same throughout. Particles are large enough to be seen and to be separated from the mixture. Particles are large enough to be seen and to be separated from the mixture.

14. Examples of heterogeneous mixtures Sand and pebbles Sand and pebbles Oil and water Oil and water Oil and Vinegar Oil and Vinegar

15. Is it uniform (even) throughout? If the answer is yes, the matter is homogeneous (looks the same throughout). If the answer is yes, the matter is homogeneous (looks the same throughout). That leads us to another question. That leads us to another question.

16. Can it be separated by physical means? If the answer is yes, the matter is a homogeneous mixture or solution. If the answer is yes, the matter is a homogeneous mixture or solution. Ex. Sand can be physically separated from water. Ex. Sand can be physically separated from water.

17. Homogeneous Mixtures A mixture that appears to be the same throughout. A mixture that appears to be the same throughout. The particles that make up the mixture are very small and not easily recognizable. The particles that make up the mixture are very small and not easily recognizable.

18. Mini Lab Time Mini Lab Time Homogenous ???? Homogenous ???? Materials ????? Materials ????? Heterogeneous??? Heterogeneous??? Materials???? Materials????

19. Mini Lab Mini Lab Homogenous Homogenous Materials: Materials:-Water-Sugar-Salt-Spoon -Clear Cups Heterogeneous Heterogeneous Materials: Materials:-Water-Oil-Vinegar-Sand-Pebbles -Clear Cups