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Elements, Compounds  & Mixtures
Matter Elements Compounds Mixtures
Elements A  pure  substance that  cannot  be  decomposed  into two or more simpler substances  by chemical processes or electricity
Elements ,[object Object],[object Object],[object Object],[object Object],[object Object]
Elements Match the symbols to their elements. Cl Arsenic Na Sulfur Mg Chlorine As Magnesium S Sodium
Metals Non-Metals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Elements Made up of particles known as  atoms
Elements Atoms  are the  smallest  particles of an  element   chemical properties of that  element
Elements Monoatomic Molecules ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],O 3 : triatomic H 2  : diatomic Kr
Elements ,[object Object],[object Object]
Molecules Elements Compounds ,[object Object],[object Object],[object Object],[object Object],O 3 : triatomic H 2  : diatomic O H H H 2 O triatomic
Quiz Which of the following are representations of compounds? O H H O C C N N
Compounds
Compounds A  pure  substance that  Contains  2 or more elements   Chemically combined S eparated by  chemical  means
Compounds P roperties are  different   from its parent elements
Compounds Since compounds are chemically combined, their formation involves an  E nergy change
Compounds C omposed of different elements combined in a  fixed ratio Hydrogen  +  Oxygen     Water  2  Hydrogen  +  1  Oxygen     1   Water
Naming Compounds ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Compounds Guess the elements present Sulfur dioxide Silver nitrate Iron(II) sulfate Nitrogen dioxide Magnesium chloride
Compounds Elements are represented by   symbols Compounds are represented by   chemical formula
Chemical Formula of Compounds ,[object Object],[object Object],[object Object]
Chemical Formula of Compounds Rules: 4) Carbon Dioxide, C O 2 4) Oxygen is usually written at the end (except for hydroxide) 3) Water, H 2 O not  H 2 O 1 3) Need not write subscript ‘1’ 2) Magnesium Carbonate,  MgCO 3 2) Number of atoms is written on the right of the symbol 1) Calcium Oxide,  Ca O 1) Metallic element is written first
Compounds Compounds can  decompose  into simpler substances  when  heat  is applied Thermal Decomposition
Mixtures Two or more  substances Added together Without chemical bonds  being formed Impure Substances
Mixtures Can be made up of; Elements + Elements Alloys Elements + Compounds Air Compounds + Compounds Our Body
Mixtures S eparated by  physical  means Chromatography  Filtration Distillation Crystallization
Mixtures P roperties are  same   as its parent elements or compounds
Mixtures Since no chemical bonds are formed, formation of mixtures involves  No   E nergy change
Mixtures C omposed of different substances combined in a  variable composition Composition of air:  20%  O 2 ,  79%  N 2,  1%  other gases Not Fixed!
Alloys Mixture  of metals with other elements Stronger than pure metals Eg: steel (Fe + C) brass (Cu + Zn) solder (Pb + Sn)

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Elements, Compounds & Mixtures Slides

  • 1. Elements, Compounds & Mixtures
  • 3. Elements A pure substance that cannot be decomposed into two or more simpler substances by chemical processes or electricity
  • 4.
  • 5. Elements Match the symbols to their elements. Cl Arsenic Na Sulfur Mg Chlorine As Magnesium S Sodium
  • 6.
  • 7. Elements Made up of particles known as atoms
  • 8. Elements Atoms are the smallest particles of an element chemical properties of that element
  • 9.
  • 10.
  • 11.
  • 12. Quiz Which of the following are representations of compounds? O H H O C C N N
  • 14. Compounds A pure substance that Contains 2 or more elements Chemically combined S eparated by chemical means
  • 15. Compounds P roperties are different from its parent elements
  • 16. Compounds Since compounds are chemically combined, their formation involves an E nergy change
  • 17. Compounds C omposed of different elements combined in a fixed ratio Hydrogen + Oxygen  Water 2 Hydrogen + 1 Oxygen  1 Water
  • 18.
  • 19. Compounds Guess the elements present Sulfur dioxide Silver nitrate Iron(II) sulfate Nitrogen dioxide Magnesium chloride
  • 20. Compounds Elements are represented by symbols Compounds are represented by chemical formula
  • 21.
  • 22. Chemical Formula of Compounds Rules: 4) Carbon Dioxide, C O 2 4) Oxygen is usually written at the end (except for hydroxide) 3) Water, H 2 O not H 2 O 1 3) Need not write subscript ‘1’ 2) Magnesium Carbonate, MgCO 3 2) Number of atoms is written on the right of the symbol 1) Calcium Oxide, Ca O 1) Metallic element is written first
  • 23. Compounds Compounds can decompose into simpler substances when heat is applied Thermal Decomposition
  • 24. Mixtures Two or more substances Added together Without chemical bonds being formed Impure Substances
  • 25. Mixtures Can be made up of; Elements + Elements Alloys Elements + Compounds Air Compounds + Compounds Our Body
  • 26. Mixtures S eparated by physical means Chromatography Filtration Distillation Crystallization
  • 27. Mixtures P roperties are same as its parent elements or compounds
  • 28. Mixtures Since no chemical bonds are formed, formation of mixtures involves No E nergy change
  • 29. Mixtures C omposed of different substances combined in a variable composition Composition of air: 20% O 2 , 79% N 2, 1% other gases Not Fixed!
  • 30. Alloys Mixture of metals with other elements Stronger than pure metals Eg: steel (Fe + C) brass (Cu + Zn) solder (Pb + Sn)