11/5/2012 Standards: 2
Objectives:
a. Complete Zum - Formation of Ionic Cmpds (computer exercise)
b. Be able to combine + and - ions in their proper ratios
DO NOW:
1. Read and be able to report on Zum – Formation of Ionic Cmpds
(today's lab)
HOMEWORK:
1. Watch this video from YouTube. Write 1) Lattice Energy on first line. Go
down 10 lines and write 2) Ionization Energy. Take 10 lines of notes on
Lattice Energy and 2 lines on Ionization Energy.
(first 4 min 30 sec) covers Lattice Energy.
(7 min 15 sec – 9 min 15 sec) covers Ionization Energy (3pts) Std: 2
2. SN Ch 8.2 p. 97-98 (2 pts) Std: 2
==========================================================
NO STAMPING TODAY
B
LACK TRAY:
Models of Ions - Cut & Paste – (5 pts) Std 2
WAIT !!
ChemThink due tomorrow night by midnight
Name: ____________ Date:______ Per:___
Models of Ions - Cut & Paste
Mg2+
PO43-
Mg2+
Mg2+
Mg2+
PO43-
PO43-
SO42-
K1+
K1+
K1+
SO42-
11/6/2012 Standards: 2
Objectives:
a. Be able to describe how ions are formed.
b. Be able to describe and write notation for ionic bond formation.
DO NOW:
1. Write the electron configuration for each of the following ions:
Na1+ Cl1- S2HOMEWORK:
1. SN Ch 8.3 & 8.4 p. 99 – 102 (3 pts) Std 2
2. Ch 8.2 Assess p. 220 12-15 (2 pts) Std 2
===========================================================
STAMPS: Journal 11/5
1. SN Ch 8.2 p. 97-98 (2 pts) Std 2
2. Stamp: Watch this video from YouTube. Write " 1) Lattice Energy" on the first line. Go down 10 lines
and write " 2) Ionization Energy". Take 10 lines of notes on Lattice Energy and 2 lines on Ionization
Energy.
ANNOUNCEMENTS:
1. Memorize Ions - 1 Thurs - 6 ions (6 pts)
nitrate ion, acetate ion, sulfate ion, carbonate ion, phosphate ion, ammonium
ion
2. IF YOU MISSED YESTERDATY'S LAB, or couldn't finish - make-ups
during lunch or befor
school
3. Pics of Friday's rally (194 pics & vids) at Photobucket.com/GHSActivities
(GHSActivities part is case sensitive) Free downloads of anything you want.
4. ChemThink due tonight at midnight.
Example of noble gas electron configuration for an element and its
ion:
the element B
[He] 2s2 2p1
the ion B3+
[He]
or
1s2
Show Interactive Chalkboard vid of reaction:
2 Na + Cl2 ----> 2
NaCl
Example of chemical reaction
Lattice Energies are always given as negative numbers
SIZE
Smaller ion
===>
more lattice energy
Larger ion
===>
less lattice energy
INDIRECT
CHARGE
Larger (+ or -) ===> more lattice energy
DIRECT
Charge more important than size
1
Which of these ionic compuounds
has the highest lattice energy?
A
B
2
Which of these ionic compuounds
has the highest lattice energy?
A
B
11/7/2012 Standards: 2 (Chemical Bonding), 5 (naming cmpds)
Objectives:
a. Mem. Ions Quiz 1 tomorrow
b. Be able to predict relative lattice energies of different molecules
c. Run ChemThink.com for Ionic Cmpds to check answers (vid on HW page)
DO NOW:
1. Write the individual ions for potassium sulfide & magnesium oxide
2. Write correct molecule formulas for each. (use criss cross method)
3. Which of these 2 compounds has the most LE (lattice energy) and why?
HOMEWORK:
1. Ch 8 Assess p. 236 67-73 (5 pts) Std 2
========================================================
STAMPS: Journal 11/6
1. Stamp: SN Ch 8.3 & 8.4 p. 99 – 102 (3 pts) Std 2
2. Ch 8.2 Assess p. 220 12-15 (2 pts)
Note for teacher
This worked really well today 11/17/11. I gave the quiz & allowed 6 min to take it. Then I had students pick + & - ions from columns 1,2,3,6, & 7
only. Common errors discussed as they showed up:
if subscript is 1, we don't write any subscript
if both charges are = but opposite - we have no subscript, because we only need 1 of ea for net zero
if subscripts are odd & even, simply use criss cross to get subscripts
symbols must be written in capital letter. If symbol is 2 letter, 2nd letter is lower case
It was difficult to do 3 questions, not enough time.
Questions answered with responders
Eric P1
Prop 30 passed
:)
Prop 32 defeated
:)
Prop 34 defeated
:)
Prop 38 defeated
:(
What can I say, were stuck with another 4 yrs of Obama. Good luck USA! :(
DO NOW - figuring charge value & largest lattice energy
potassium sulfide
ions
magnesium oxide
ions
potassium sulfide
formula
magnesium oxide
formula
Winner?
Why?
potassium sulfide
charge value
magnesium oxide
charge value
p
Practice Problems
1. K & S
2. Mg & O
K
1+
S
Mg
2+
O
2-
2-
K2S
MgO
*the subscripts cancel
each other out
3. Na & F
Na
1+
1-
F
*the subscripts cancel
each other out
NaF
Rules for Making Ionic Compounds
Use
the oxidation # of element.
For all representative elements, group #
determines oxidation #. Group 1 = 1+
Group 2=2+, Gp 3=3+, Gp 6=2-, Gp 7=1-
EXAMPLE: Write the correct formula with the following
2 elements: Ca & Cl
Ca
2+
1-
Cl
Since the charges are different you will need to use subscripts to indicate the ratio of
ions in the formula
Ca
Ca
2+
1
1-
Cl
1-
Cl
2+
Step 2:
Remove + and - signs
CaCl2
--->
Step 1:
Cross the
charges
over
Ca 1 Cl
Step 3: Write the completed formula, no 1's &
smallest ratios
---
2
Use course-2-assignment-ionic-formulas.notebook
to intro how ions bond ====> ratios of ions
Practice putting a metal (columns 1-3) with a nonmetal (columns 6 or 7)
3
If the follwing 2 atoms react with each other to form an
ionic molecule, what with the formula be?
49In +
Se ----->
34
Answer
?
4
If the follwing 2 atoms react with each other to form an
ionic molecule, what with the formula be?
11Na +
S ----->
16
Answer?
5
If the follwing 2 atoms react with each other to form an
ionic molecule, what with the formula be?
39Sr + 8O ----->
Answer?
11/8/2012 Standards: 2
Objectives:
a. Be able to define "sea of electrons, substitutional and Interstitial alloys
b. Demoes of Mg + O2 ---> and conductivity of salts in water.
c. Be able to name some simple ionic compounds
d. Be able to put + & - ions together in their proper ratios
DO NOW:
1. Slap-it for the following ions: ammonium, nitrate, sulfate, photphate,
acetate, carbonate
HOMEWORK:
1. Ch 8.4 Sec Assess, p. 231 40-44 (2pts) Std: 2
2. Ch 8 Assess, p. 237 80-84 (3pts) Std: 2
========================================================
STAMPS:
Journal 11/7
1. Ch 8 Assess p. 236 67-73 (5 pts) Std 2
ammonium, nitrate, sulfate,
phosphate, acetate, carbonate
See link in Web Helps > Ch 5 > Songs
(the first one)
11/8/12
15 lines? YES
BUT only 5 questions
If you use pencil - you cannot get an error in
grading corrected
If you use pen - you can get an error in
grading corrected, if and only if you do not
have a cross out
When done
turn over quiz
turn over ans sheet
P3 stopped at formula on top
11/9/2012 Standards: 2 (Chemical Bonds)
Objectives:
a. Be able to define "sea of electrons, substitutional and Interstitial alloys
b. Be able to name some simple ionic compounds
c. Be able to put + & - ions together in their proper ratios
DO NOW:
1. Write these pairs of atoms as ions, and then create the correct formulas
they will form:
a. sodium & acetate
for the molecules
b. beryllium and
carbonate
HOMEWORK:
1. HANDOUT - Writing Chemical Formulas from Ions (5 pts) Std 2
2. Card Dec for: Chromate ion, dichromate ion, chlorite ion
========================================================
BASKET:
Journal 11/8
1. Ch 8.4 Sec Assess, p. 231 40-44 (2pts) Std: 2
2. Ch 8 Assess, p. 237 80-84 (3pts) Std: 2
DO NOW
Rules for Making Ionic Compounds
Use the
oxidation # of element.
For MOST representative elements,
group # determines oxidation #.
EXAMPLE: Write the correct formula with the following
2 elements: Ca & Cl
2+
Ca
1-
Cl
Since the charges are different you will need to use subscripts to indicate the ratio of
ions in the formula
1
Step 1:
Cross the
charges
over
TAKE
ABSOLUTE VALUE
Ca
1
CaCl2
Cl
2
Step 2: Write the completed formula, no 1's &
smallest ratios
Naming Ionic Molecules
Metal or positive ions (always written first) use name of metal or name of positive ion
Non-metal (negative)
Ions of single atoms - name of atom but use ending -ide
Polyatomic - use name of ion (see mem. ions)
ctice
Pra
Na
carbonate
Ba
sulfate
Be
acetate
Ca
chlorine
Mg
sulfur
Al
oxygen
ANSWERS:
Na2CO3
BaSO4
Al2O3
Be(C2H3O2)2
CaCl2
MgS
Homework questions from last night
Note blue haze represents
“sea of electrons - text p. 228
Show molecules of different types
and
how they are packed (other laptop)