Matter and Chemical Change #2

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Matter and Chemical Change #2
2013-04-03 16:11:31

Science 9
Show Answers:

  1. Understand compounds (how many elements? atoms? are in a chemical formula)
    • How many elements ex: C6H12O6 = 3 elements
    • How many atoms ex: C6H6 = 12 atoms
  2. What elements make up common substances like Table Salt, Aspirin, and Sugar?
    • TS - NaCl (Sodium & Chlorine)
    • Aspirin - CHO (Carbon, Hydrogen & Oxygen)
    • Sugar - C6H12O6 (Carbon, Hydrogen & Oxygen)
  3. What is the name given to the #'s 2 and 3 in H2O3?
    • Coefficient's;
    • H2 = Subscript
    • H2 = Superscript
  4. Difference between Chemical names, chemical equations, chemical formulas, and chemical symbols.
    • Name : Hydrogen
    • Symbol : H
    • Formula :H2O
    • Equation : 2H2O --> O2 + 2H2
    • Word equation : Water --> Oxygen + Hydrogen
  5. How to write common chemical formulas for water, carbon dioxide, Table Salt, carbon monoxide, glucose and ammonia?
    • Water : H2O
    • Carbon Dioxide : CO2
    • Table Salt : NaCl
    • Carbon Monoxide : CO
    • Glucose : C6H12O6
    • Ammonia : NH3
  6. Understand that 2H2O means 2 molecules of water. How would you write 6 molecules of glucose?
    • 2H2O = H2O + H2O basically
    • 6C6H12O6
  7. When naming Ionic Compounds, does the metal go first or last? What does the ending change to? Who came up with this method and where was he from?
    Metal goes first. It changes to Ide. Marveau from France came up with it.
  8. What does Aqueous mean?
    It means it dissolves in water.
  9. Be able to draw models of a compound.
  10. What is an ion? In order for an atom to become charged positively, will it have to lose or gain electrons? Does +1 or -1 have a larger charge?
    An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.

    It has to lose an electron to become positively charged.
  11. Perfect salt crystals have what shape?