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Chemical Formula

Chemical Formula. D. Crowley, 2007. Chemical Formula. To understand chemical formula. Definitions. Define an element, compound and mixture An element is made up of just one type of atom A compound is two or more elements, chemically bound

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Chemical Formula

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  1. Chemical Formula D. Crowley, 2007

  2. Chemical Formula • To understand chemical formula

  3. Definitions • Define an element, compound and mixture An element is made up of just one type of atom A compound is two or more elements, chemically bound A mixture is made of different substances, not chemically bound

  4. Elements & Compounds • Look at the rocket - it uses liquid hydrogen as a fuel • The engine mixes this hydrogen with oxygen, adds a spark and the reaction takes place • The elements are • They react together, forming a compound called

  5. Elements & Compounds • Look at the rocket - it uses liquid hydrogen as a fuel • The engine mixes this hydrogen with oxygen, adds a spark and the reaction takes place • The elements are hydrogen and oxygen • They react together, forming a compound called hydrogen oxide (water)!

  6. Chemical Equations • Chemical equations show us our reactants and products reactants products • They can be word or symbol equations, e.g. Carbon + oxygen carbon monoxide C + O  CO

  7. Formula • Elements and compounds can be represented using chemical formula • We use numbers in the formula, which represents the number of atoms present (as a ratio) C = 1 atom of carbon (C) O2 = 2 atoms of oxygen (O) CO2 = 1 atom of carbon (C); 2 atoms of oxygen (O) NaCl = 1 atom of sodium (Na); 1 atom of chlorine (Cl) H2SO4 = 2 atoms of hydrogen (H); 1 atom of sulphur (S); 4 atoms of oxygen (O)

  8. Graphical • Can you draw the following substances • The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

  9. Graphical • Can you draw the following substances • The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

  10. Graphical • Can you draw the following substances • The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

  11. Graphical • Can you draw the following substances • The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

  12. Graphical • Can you draw the following substances • The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

  13. Graphical • Can you draw the following substances • The formula should help you graphically represent them… Oxygen O2 Carbon dioxide CO2 Sodium chloride NaCl Sulphuric acid H2SO4 Carbon C Nitric acid HNO3

  14. Questions • Write down how many atoms there are (and of what element) for the following: - • C - e.g. 1 x carbon (C) • CO2 • H2O • CaCO3 • H2SO4 • NaCl • HNO3 • CuCO3 • MgCl2 • Carbon monoxide • Hydrogen oxide

  15. Presentation • If there is time left, produce a poster in your book which explains formula (as a revision guide) • You may wish to add examples, and ways to work out the ratio of atoms…

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