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# Unit 2 - Classifying Matter

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Classifying matters into elements, compounds, molecules, mixtures and pure substances.

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• many thanks. this is a big help for my teaching science in grade 7. salamat

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### Unit 2 - Classifying Matter

1. 1. Jeff Taylor<br />Courses:<br />Physical Science<br />Contact Information<br />jtaylor@insightfaculty.net<br />602-476-2141<br />Family: Wife Linda and 19-month daughter Hilina<br />Detailing out travels and hikes on our blog: www.hikemasters.com<br />and<br />www.taylorlenz.blogspot.com<br />Living out of our 22 ft trailer and spending the <br />next 6 months in Desert Southwest.<br />
2. 2. Unit 2<br />Mr. Taylor<br />Classifying Matter<br />
3. 3. What is Matter Made Of?<br />Protons: + charge, 1 AMU, in nucleus<br />Neutrons: neutral charge, 1 AMU, in nucleus<br />Electrons: - charge, 1/1000th AMU, electron cloud<br />The number of protons decides the element number.<br />The number of electrons decides the ionic/oxidation state.<br />The number of neutrons decides the isotope<br />
4. 4. Elements<br />An element is the most basic form of matter.<br />It is defined by the number of protons.<br />Usually, the number protons and the number of electrons are equal.<br />
5. 5. Atomic Number is the number of Protons<br />Atomic Mass is Protons and Neutrons together<br />
6. 6. Elements<br />An element is the most basic form of matter.<br />It is defined by the number of protons.<br />Usually, the number protons and the number of electrons are equal.<br />Secret Question #1:<br />Which element is this?<br />
7. 7. Isotopes<br />Isotopes are variations on elements, where the number of neutrons is different.<br />Since neutrons are neutral in charge, they do not affect the properties of the element, only the weight.<br />This isotope is Lithium-7<br />It has 3 protons and 4 neutrons. <br />If it only had 3 neutrons, it would be Lithium-6<br />
8. 8. Atomic Number is the number of Protons<br />Atomic Mass is Protons and Neutrons together<br />
9. 9. Most Elements Do NOT Occur in the Pure Form<br />
10. 10.
11. 11. Molecule<br />A molecule consists of two or more atoms.<br />They can be the same element (N2)<br />Or different elements. <br />CO – carbon monoxide<br /> C2H4 – ethylene<br />C6H12O6 - glucose<br />
12. 12. Proteins are HUGE Molecules<br />
13. 13. Compounds<br />Compounds contain two or more elements.<br />
14. 14. Compounds<br />water (dihydrogenoxide) salt (sodium chloride) ammonia (NH4) <br />rust (iron oxide) chalk (calcium carbonate) sugar (glucose)<br />
15. 15. Elements<br />Elements have only ______ type of atom<br />Elements are defined by the number of ______.<br />The whole universe is made from about _____ different elements.<br />The most common element in the universe is __________.<br />*If you are watching by recording, send me these sentences with the answers*<br />
16. 16. Compounds<br />Most elements do ____ exist on their own<br />They join with other ___________ to form ____________ .<br />Compounds may have __________ different types of elements in them.<br />*If you are watching by recording, send me these sentences with the answers*<br />
17. 17. Mixtures <br />Homogeneous or Heterogeneous?<br />If it is distributed equally it is homogenous. <br />If it separates into layers, it is heterogeneous<br />Colloids are suspended mixtures that do not separate. Milk is an example.<br />Otherwise, over time the layers will separate, such as mud in a lake.<br />
18. 18. Solution<br />A solution involves a reaction between molecules due to electromagnetic charges. Solutions are by definition transparent.<br />
19. 19. Solutions and Mixtures Demo<br />Notice that they are clear? They are solutions!<br />Watch Video to See What Happens When They are Mixed<br />
20. 20. Solutions and Mixtures Demo<br />Notice that they are clear? They are solutions!<br /> Now that it is not clear, it is no longer a solution, but a mixture.<br />
21. 21. Precipitate<br />A precipitate are solids that form during a chemical reaction between two solutions.<br />
22. 22. Mixtures<br />Iron and Sulfur powder in a the mixture<br />So, it is hypothesis time:<br />How can we separate the iron from the sulfur?<br />Enter some ideas in the chat box.<br />
23. 23. Mixtures<br />Iron and sulphur – the mixture<br />How can we separate the iron from the sulphur?<br />Use a magnet!<br />Iron is magnetic, sulfur is not...<br />
24. 24. Turning an iron-sulphur mixture into a Compound<br />Heat<br />Fe + S FeS<br />Compounds form as a result of chemical reactions<br />
25. 25. When iron and sulfur react<br />+<br />sulfur(S) atoms iron (Fe) atoms<br />
26. 26. When iron and sulfur react<br />+<br />sulfur(S) atoms iron (Fe) atoms<br />iron sulfide(FeS) molecules<br />
27. 27. Differences between compounds and mixtures<br />MIXTURES<br />COMPOUNDS<br />Mixtures can be separated easily<br />Compounds can not be separated<br />
28. 28. Differences between compounds and mixtures<br />MIXTURES<br />COMPOUNDS<br />Mixtures can be separated easily<br />Mixture have the properties of the substances present in it<br />Compounds can not be separated<br />Compounds do not have the properties of the elements<br />
29. 29. Differences between compounds and mixtures<br />MIXTURES<br />COMPOUNDS<br />Mixtures can be separated easily<br />Mixture have the properties of the substances present in it<br />No chemical change takes place when a mixture is made<br />Compounds can not be separated<br />Compounds do not have the properties of the elements<br />A compound is always formed due to a chemical reaction<br />
30. 30. Differences between compounds and mixtures<br />MIXTURES<br />COMPOUNDS<br />Mixtures can be separated easily<br />Mixture have the properties of the substances present in it<br />No chemical change takes place when a mixture is made<br />There is no heat taken in or given out when a mixture is made<br />Compounds can not be separated<br />Compounds do not have the properties of the elements<br />A compound is always formed due to a chemical reaction<br />Heat is either taken in or given out when a compound is made<br />
31. 31. Differences between compounds and mixtures<br />MIXTURES<br />COMPOUNDS<br />Mixtures can be separated easily<br />Mixture have the properties of the substances present in it<br />No chemical change takes place when a mixture is made<br />There is no heat taken in or given out when a mixture is made<br />A mixture can contain elements in any proportion<br />Compounds can not be separated<br />Compounds do not have the properties of the elements<br />A compound is always formed due to a chemical reaction<br />Heat is either taken in or given out when a compound is made<br />A compound always contains the elements in fixed proportions, e.g. FeS contains 7g of iron to 4g of sulphur<br />
32. 32. An Introduction to Pure Sodium Metal<br />Watch Video That Shows Pure Metallic Sodium<br />
33. 33. A fun chemical reaction that you <br />SHOULD NOT TRY AT HOME!<br />Sodium in water = BOOM<br />2Na + H20 = 2NaOH + H2 + Heat<br />