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Compounds

Compounds. Objectives. Explain the difference between element and compound Compare atoms and molecules Define chemical formula. Elements. Pure substances that cannot be separated into different substances by physical means Are the building blocks of matter 100+ elements known today.

iris-morris
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Compounds

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  1. Compounds

  2. Objectives • Explain the difference between element and compound • Compare atoms and molecules • Define chemical formula

  3. Elements • Pure substances that cannot be separated into different substances by physical means • Are the building blocks of matter • 100+ elements known today

  4. Element Symbols • Use 1, 2 or 3 letter abbreviations • Capitalize the first letter only Examples: C carbon Co cobalt N nitrogen Ca calcium F fluorine Br bromine O oxygen Mg magnesium

  5. Latin Names Element Symbol Latin name Copper Cu cuprum Gold Au aurum LeadPbplumbum Mercury Hghydrargyrum Potassium Kkalium Silver Ag argentum Sodium Nanatrium TinSnstannum

  6. Periodic Table The periodic table is an arrangement of the elements according to similarities in their chemical and physical properties.

  7. Families of Elements • Vertical columns on the periodic table • Similar physical properties • Similar chemical properties • Same number of electrons in the outer shell

  8. Periods • Horizontal rows from Group 1 to Group 7 • Arranged by atomic number • Each row has the same number of shells

  9. Valence Electrons • electrons in outermost energy level • Determine how atom will react chemically • Octet rule-atoms want 8 valance electrons

  10. Atoms combine together to form most of the substances in the world. Compounds - two or more atoms chemically joined together forms a new substance with very different properties

  11. + Sodium + Chlorine = Sodium Chloride =

  12. Molecule The smallest piece of a compound is that still has all of the properties of the compound.

  13. Chemical Formulas: H2O • C6H12O6 • 3CO2 • Ba(NO3)2

  14. Chemical Equation 2H2 + O2  2 H2O

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