october 4*5*1/1/1*1, 2009
DESCRIPTION
October 4*5*1/1/1*1, 2009. Objectives SWBAT show the formation of ionic bonds SWBAT make create balanced ionic compounds SWBAT Track tests Catalyst How many electrons will the following atoms need to gain or lose to be stable?? Na Cl Pb Xe Ca. Catalyst Review Tracking - PowerPoint PPT PresentationTRANSCRIPT
October 4*5*1/1/1*1, 2009
Objectives• SWBAT show the formation of ionic bonds• SWBAT make create balanced ionic compounds• SWBAT Track tests
Catalyst• How many electrons will the following atoms need to
gain or lose to be stable??– Na– Cl– Pb– Xe– Ca
Unit 3 CHAMPIONS!! (90% and above)
Period 2 (79% Avg)• DiQuan Forcell• Ruben Garcia• Dalvin Hickerson• Iesha Nelson• Jahaira Sanchez• Brandon Toney
Period 3 (80% Avg)• Jasmine Castro• Jonathan Cordero• Christina DeArmas• Taylor Delaune• Kaynetra Hunter• Angelle Johnson• Harpreet Kaur• Jontrel Mackey• Kevin Martin• Isaac Wallis• Steven Webb
Formation of an ion
• How many electrons do the following atoms gain or lose to become stable?– Na – Cl– We have a new method of writing this:
• We call it showing the formation of an ion
• What is different about how we write each one?
Lose 1e-
Gain 1e-
Na Na+ + 1e-Cl + 1e- Cl-
Losing electrons
Gaining electrons
Formation of ion practice
• Show the formation of the following ions:• First figure out if it will gain or lose e-• Then show the formation of the ion
– H– B– Mg– O– I
Ionic BONDS!
• When an ionic bond forms, we need to balance out the oxidation numbers (charges) to equal ZERO.
• In other words, the same number of electrons need to be gained or lost overall
Ionic BONDS!
• If we wanted to form an ionic bond between Sodium and Chlorine…
1. Show the formation of the stable ions– Na Na+ + 1e-– Cl + 1e- Cl-
2. Make sure the same number of electrons have been transferred, if not then multiply to make them the same
3. Write out your final expression showing the number of each atom
Na+ + Cl- NaCl
Let’s try another one!
• Show what ionic compound will form from Potassium and Sulfur.1. Show the formation of the stable ions
2. Make sure the same number of electrons have been transferred, if not multiply to make them the same.
3. Write out your final expression
Try these on your own
• Show what ionic compounds will form:– Aluminum and Oxygen– Rubidium and Iodine– Magnesium and Oxygen– Strontium and Nitrogen
Alright…
• That process takes a long time…scientists aren’t going to do it every single time.
• WE HAVE A SHORCUT TO FIND WHAT IONIC COMPOUND WILL FORM!
• Get ready for it…
Kris Kross Method!
Ca3As2
Ca2+As3-
Write down the stable ions and cross the oxidation
numbers (charges) to make them subscripts
Na1+Cl1- NaCl
Pb4+O2- Pb2O4
Balancing Chemical Reactions
KF Ba3N2
Ga2O3 CaCl2
K4Si Group 1 2 3 4 5 6 7 8
Charge 1+
2+
3+
4-
3-
2-
1-0
Practice with writing formulas for ionic
compounds
Group 1 2 3 4 5 6 7 8Charge 1+ 2+ 3+ 4- 3- 2- 1- 0