1) bell ringer: what are valence electrons? what is the difference between an ionic and molecular...
TRANSCRIPT
DECEMBER 17, 20131) Bell Ringer: What are
valence electrons? What is the difference between an ionic and molecular compound?
2) Worksheet #133) QUIZ #6
Draw Picture of a sodium and chlorine atom:
Now, draw a picture of a sodium and chlorine ion:
Cations and Anions
Cations are ions with a POSITIVE charge. Anions are ions with a NEGATIVE charge. Draw the funny way to remember cations
and anions:
Compounds
Atoms bonded together with an IONIC bond are called compounds.
An ionic bond is a METAL bonded with a NONMETAL.
Draw the crystal lattice structure for sodium chloride:
Empirical Formula
Refers to the ratio of ions in a compound
NaCl has a ratio of 1:1 (1 to 1). MgCl2 has a ratio of 1:2 (1 to 2). AlCl3 has a ratio of 1:3 (1 to 3).
Lewis Dot Structures
Sodium
2) Chlorine
3) Magnesium
4) Oxygen
5) Nitrogen
Oxidation Number
Charge that an atom will have if made into an ion.
Na becomes Na+, so its oxidation number is POSITIVE.
Cl becomes Cl-, so its oxidation number is NEGATIVE.
Ionic Combinations
If I combine magnesium and fluorine, what will its empirical formula be?
MgF2
Sodium oxide (Sodium and oxygen) Na2O
Magnesium oxide MgO
Criss -Cross Method
Lithium oxide
Magnesium oxide
Do on your own right now and then share with a partner.
SHOW YOUR WORK!! The answer is MgO
REACTION OF SODIUM AND CHLORINE
http://www.youtube.com/watch?v=Mx5JJWI2aaw
IONISATION
http://www.youtube.com/watch?v=TStutMsLX2s
QUIZ #6
1) How many valence electrons does Magnesium have?
2) An ionic compound consists of a metal and a _________________.
3) What is the name of an ion that is positive?