Chemical Symbols and Formulas

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Presentation transcript:

Chemical Symbols and Formulas Chapter 2.7

Chemical Symbols All elements in the Periodic Table have symbols that are recognized world wide. It does not matter which country you are in or the language you speak. Example: The element Iron is always identified by “Fe” and Oxygen is “O”. The names are not always the same but the symbols are. “Fe” is iron in Canada, fer in France and fier in Romania.

Chemical Symbols A Chemical symbol is an abbreviation of a name of an element. Capital letter if only one letter. Only first letter capital if more than one letter Element Chemical Symbol Oxygen O Nitrogen N Hydrogen H Sodium Na

Sodium comes from the word sodanum, a headache remedy, and it’s symbol (Na) comes from the Latin word Natrium.

Chemical Formulas A chemical formula is the combination of symbols that represent a particular compound. The chemical formula indicates which elements are present in the compound and in what proportions. Ex. 1: Water molecule H2O: 2 atoms of hydrogen, 1 atom of oxygen Ex. 2: Iron Oxide molecule Fe2O3: 2 atoms of iron, 3 atom of oxygen

Chemical Formulas - Examples Calcium Carbonate (chalk) – CaCO3 Sodium Chloride (salt) – NaCl Acetysalicylic acid (aspirin) – C9H4O8 Acetic acid (vinegar) – C2H4O2

Chemical Formulas NOTES: - Each symbol in a formula represents an element. - If only one atom of an element is present in the compound, no subscript is used. - If more than one atom of an element is used, then the symbol is followed by a number indicating how many atoms are used. This is called the subscript.

Homework Do Questions #1–5 on Page 59 You may use your Periodic Table. Make sure that for each question you write out that question first then you write your answer and then continue on to the next question and so on until completed.

2 atoms of hydrogen (in a hydrogen molecule) 1 atom of sodium 2 atoms of hydrogen (in a hydrogen molecule) 3 atoms of magnesium 2 atoms of phosphorus 8 atoms of oxygen 13 total atoms 3 carbon atoms

Tomorrow Go over counting atoms worksheet Pass in Homework Chapter 2 quiz