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Prelude

Prelude. Elements & C o m p o u n d S. Cleopatra N. Cruz Third Year.

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Prelude

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  1. Prelude

  2. Elements & CompoundS Cleopatra N. Cruz Third Year http://www.google.com.sg/imglanding?q=elements%20and%20compounds&imgurl=http://www.mghs.sa.edu.au/Internet/Faculties/Science/Year10/Pics/elementsAndCompounds.gif&imgrefurl=http://www.mghs.sa.edu.au/Internet/Faculties/Science/Year10/elementsAndCompounds.htm__

  3. Objectives • At the end of the lesson the students will be able to • Define and differentiate elements and compounds • Enumerate examples of elements and compounds • Perform an experiment to demonstrate difference on elements and compound

  4. What do they THINK? Recall “Anything that has mass and occupies space” What is MATTER?

  5. Investigate! Macroscopic Level What do they SEE? KI NaHCO3

  6. Teach Key Concepts Teach key concepts Define Elements Tell: All matter is made up of ELEMENTS Teach: Display a large Periodic Table. Explainall the known elements are in the periodic table, represented by symbols

  7. Periodic Table &Chemical Symbols Where can we find the known elements? METALS NON-METALS METALLOIDS H O Na Cl Fe S http://www.google.com.sg/imglanding?q=elements%20and%20compounds&imgurl=http://www.mghs.sa.edu.au/Internet/Faculties/Science/Year10/Pics/elementsAndCompounds.gif&imgrefurl=http://www.mghs.sa.edu.au/Internet/Faculties/Science/Year10/elementsAndCompounds.htm&usg=__BICH2l4FwRlQWxVeikHDiFbgtxI=&h=398&w=498&sz=9&hl=en&sig2=OvbJYuaX5hSY1RolAlGKzQ&um=1&itbs=1&tbnid=azSUYmdY1epM5M:&tbnh=104&tbnw=130&prev=/images%3Fq%3Delements%2Band%2Bcompounds%26um%3D1%26hl%3Den%26lr%3D%26sa%3DX%26tbs%3Disch:1&ei=vRbFS7TcOIyxrAfw0NWUDg&um=1&lr=&sa=X&tbs=isch:1&start=0#tbnid=EnWNrRdokhAboM&start=6

  8. Types of Atoms coin ATOMS Of SOLID Particles are closely packed and close contact with each other

  9. Atoms of Elements Milk ATOMS of LIQUID Atoms are distant and has space between them

  10. Atoms of Elements aerosol ATOMS of (monoatomic) Gases Atoms are far apart and randomly move

  11. Teach Key Concepts • Defining Compounds • Focus: Explain that most elements in nature are found combined with other elements • Teach:Write the definition of compound on the board. • Underlinethe phrases pure substance, chemically combined, and set ratio.

  12. What does a chemical formula tell you about a compound?

  13. How do we combine elements? O O O H H C C Cl Na Na NaHCO3 H2O CO NaCl

  14. Formation of Compounds Hydrogen (H2) + Oxygen (O2)  H2O (water) Sodium (Na) + Chlorine (Cl) NaCl (salt) O H H Na Cl

  15. Activity 2 Elements and Compound • Watch a video clip to perform similar activity • Prepare a an activity sheet to record your data • Answer the guide questions • Work in group • Present your output in a prepared manila paper

  16. Video Clips on Experiment

  17. Discussion • 1.Does iron in the mixture still have the properties of pure iron? • 2.Does sulphur in the mixture still have the properties of pure sulphur? How can you tell? • 3.What can you do to prove that the iron and sulphur still retain their properties?

  18. DISCUSSION • If the mixture of the iron and sulphur is heated, the mixture glows and a new substance is formed. This substance is a compound called iron sulfide. • Does iron in the compound still have the properties of pure iron? How can you tell? • Does sulphur in the compound still have the properties of pure sulphur? How can you tell?

  19. Presentation of Results

  20. SUMMARY ELEMENTS -A _________ that cannot be broken down into simpler substance. -It is the___________ substance. - It is represented by__________ How can you tell one element from the other? -Each element can be identified by its physical and chemical properties. pure substance simplest symbols specific

  21. Exercises Macroscopic Level Microscopic Level Symbolic Level • Gold Oxygen Au O2

  22. Compound • A compound is a substance formed when two or more elements are chemically joined • A+BAB • AC + BD ADBC • ABC+D BCD+A • When the elements are joined, the atoms lose their individual properties and have different properties from the elements they are composed of.

  23. Let’s try this… Qs: Why are compounds a kind of pure substance? Ans: Compounds are single type of matter with specific make up and specific properties Qs: How are compounds different from the elements that make up them? Ans: Compounds have different properties

  24. Exercise Macroscopic Level + • Microscopic Level • Symbolic Level 2H2 + O2  2H2O

  25. REFERENCES • Books • Tan Yin Toon et al, Chemistry Matters. Elements and Compound. C.O.S Printers Pte Ltd, Singapore • Brown, Theodore. Chemistry, The Central Science, Pearson Educational Inc.,USA • Website • Science Interactive, Teachers Express. California, USA • http://www.google.com.sg/imglanding?q=elements%20and%20compounds&imgurl

  26. Activity 1 • Teacher will bring some of the objects into the classroom. • The students in groups will classify 1 substance as to kind of matter that make up the things they see. • To understand the nature of matter, it helps to identify whether this is simple or complex. • Simple if it has one element or complex if it has more than one element. • Write the name of the substance in 1/8 manila paper and flash in the class

  27. Let’s try this one!

  28. 1.Which of the given substances can be split-up or broken down into its elements? • Carbon • Copper • Water • Oxygen

  29. Correct ! • Compounds are made up of two or more elements forming a molecule.

  30. 2. The elements of hydrogen and oxygen were combined to form water. Arrange the following atoms and molecules according to its occurrence. X Z Y W YWXZ ZXWY WXYZ XYZW H2 O2

  31. Correct ! • Feedback: Hydrogen has smaller molecule compared with oxygen because of lower atomic mass. H(atom )+O(atom) H2Omolecule

  32. 3.Iron fillings and sulfur powder formed a mixture. Which of the two substances retained its original properties? • A. Iron • B. Sulfur • C. Both Iron and Sulfur • D. Neither Iron nor Sulfur

  33. Correct ! Feedback: Neither retained its original properties. The compound formed is entirely new because it has different properties from the elements.

  34. 4.The element magnesium burns with oxygen.Which is true in this chemical reaction? • Heat is used to break down the compound into elements. • The compound formed has the same properties of the elements combined. • Heat or light are not necessary components in the formation of compounds. • When the element magnesium burns with oxygen, a new substance magnesium oxide is formed.

  35. Correct ! Feedback: Neither retained its original properties. The compound formed is entirely new because it has different properties from the elements.

  36. 5.From the reaction of iron and sulfur, what new properties of iron and sulfur were observed? • It was black and brittle • It was powdery and yellow • It was silvery black and hard • It was white, fine textured particles

  37. Correct ! Feedback • The new substance formed which is iron sulfide has different properties from the original properties of elements combined.

  38. Incorrect!

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