Unit 4 Power Point

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Unit 4 Power Point

  1. 1. Physical Science<br />Chemical Properties<br />
  2. 2. Atoms and Molecules<br />An Atom is made up of protons, electrons, and neutrons.<br />An Element is a unique number of protons.<br />When 2 or more atoms combine together chemically, it is called a molecule.<br />
  3. 3. Molecular Elements<br />These are allotropes of carbon<br />
  4. 4. Compounds<br />2 or more elements combined in a molecule<br />
  5. 5. What is a Chemical Reaction?<br />It is the rearrangement of atoms to form new molecules.<br />CH4 + 2O2 CO2 + 2H2O<br />
  6. 6. What is a Chemical Reaction?<br />It is the rearrangement of atoms to form new molecules.<br />CH4 + 2O2 CO2 + 2H2O<br />
  7. 7. What is a Chemical Reaction?<br />It is the rearrangement of atoms to form new molecules.<br />CH4 + 2O2 CO2 + 2H2O<br />
  8. 8. What is a Chemical Reaction?<br />Some chemical reactions are exothermic<br />They release energy as heat, light, or other forms.<br />
  9. 9. What is a Chemical Reaction?<br />Some chemical reactions are endothermic<br />They absorb energy from the environment to proceed.<br />
  10. 10. Chemical Properties<br />Chemical properties can only be observed when the substances in a sample of matter are ________________.<br />_____ and _____ are examples of chemical properties<br />
  11. 11. Chemical Properties<br />Chemical properties can only be observed when the substances in a sample of matter are ________________.<br />Changing into different substances<br />_____ and _____ are examples of chemical properties<br />
  12. 12. Chemical Properties<br />Chemical properties can only be observed when the substances in a sample of matter are ________________.<br />Changing into different substances<br />_____ and _____ are examples of chemical properties<br />Flammability<br />Reactivity <br />
  13. 13. Triggers to Chemical Reactions<br />Most reactions do not occur spontaneously. <br />Most require some trigger to get started.<br />This could be a spark or even a touch.<br />Let’s watch a fun video of a chemical reaction that is sensitive to the touch!<br />
  14. 14. Nitrogen Triiodide<br />2 NI3 (s) -> N2 (g) + 3 I2 (g), <br />
  15. 15. Nitrogen Triiodide Decomposition<br />
  16. 16. Some Fun Experiments<br />Mr. Taylor Does Nitrogen Triiodide<br />http://www.youtube.com/watch?v=hERVtZEZrFQ<br />
  17. 17. Some Fun Experiments<br />THERMITE!<br />http://www.youtube.com/watch?v=sjLgzgflCk8<br />
  18. 18. Some Fun Experiments<br />Pure Metallic Sodium in Water!<br />http://www.youtube.com/watch?v=gFnNXkcoDSs<br />
  19. 19. Recognizing Chemical Change<br />Chemical changes are taking place if you see a _____, ______, or ______.<br />Change in color<br />Production of a gas<br />Formation of a precipitate<br />**If you are watching by recording, send me the sentence above with the answers**<br />
  20. 20. 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 />
  21. 21. 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 />
  22. 22. Turning an iron-sulphur mixture into a Compound<br />Heat<br />Fe + S FeS<br />
  23. 23. When iron and sulphur react<br />+<br />sulphur (S) atoms iron (Fe) atoms<br />
  24. 24. When iron and sulphur react<br />+<br />sulphur (S) atoms iron (Fe) atoms<br />iron sulphide (FeS) molecules<br />
  25. 25. Differences between compounds and mixtures<br />MIXTURES<br />COMPOUNDS<br />Mixtures can be separated easily<br />Compounds can not be separated<br />
  26. 26. 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 />
  27. 27. 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 />
  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 />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 />
  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 />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 />

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