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Ionic Compounds

Ionic Compounds. What do these have in common?. CO 2 H 2 O C 3 H 8 HCl C 6 H 12 O 6 MgCl K 2 O. They are all compounds – 2 or more elements chemically bound together. Ionic Compounds.

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Ionic Compounds

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  1. Ionic Compounds

  2. What do these have in common? CO2 H2O C3H8HCl C6H12O6 MgCl K2O

  3. They are all compounds – 2 or more elements chemically bound together

  4. Ionic Compounds • Ionic compounds are compounds that consist of a positive ion and a negative ion that are attracted to one another because of their opposite electrical charges.

  5. What are ions? • An atom or group of atoms that has gained or lost electrons and has a negative or positive charge as a result.

  6. Positively charged ions (cations) • Ca2+ Na+ K+ Mg2+ Al3+ Sr2+ The first one is a calcium ion. What are the other ones called?

  7. Ionic Compound Note Sheet On your handout, write the names of the cations (positively charged atoms) in the space provided. If you need help, the sub has a key. But, seriously, this is easy. USE YOUR PERIODIC TABLE!

  8. Negatively charged ions (anions) Cl- F- O2- P3- S2- N3- The first one is a chloride ion. What are the other ones called?

  9. Ionic Compound Note Sheet On your handout, write the names of the anions (negatively charged atoms) in the space provided. If you need help, the sub has a key. But, seriously, this is easy. Just use -ide USE YOUR PERIODIC TABLE!

  10. What happens when two oppositely charged ions come together? Na+ + Cl- ?

  11. They form an ionic compound that has a neutral charge! NaCl

  12. Ionic Compound Note Sheet • Take all 6 positively charged atoms (cations)from the first tableand combine them with the 6 negatively charged atoms (anions)from the second table and write their names in the third table of your handout.

  13. Names are easy – positive ions first and negative ions lastSodium chloride You will have 36 names to write on the third table of your handout.

  14. Formulas? Remember they have to be neutral after they combine Ca2+ + Cl- ?

  15. This is a little trickier. The positive atoms must cancel out the negative atoms. You can have as many positive and negative atoms as you like to do this.

  16. Ca2+ combines with 2 Cl- to give: CaCl2 The 2 chlorides add up to -2, cancelling out the +2 charge of the calcium. It’s neutral!

  17. You need 2 chlorides (Cl-1) for every calcium (Ca+2).The resulting formula is neutral (no charge).CaCl2

  18. Ionic Compound Note SheetOn you handout, write down the formulas for all 36 of the ioniccompounds you named in the previous table. Remember, theywill all have a neutral charge. The positive charges will cancel out the negative charges.

  19. Polyatomic Ions Polyatomic ions are groups of atoms that have either a positive or negative charge Positive: NH4+ ammonium Negative: SO42- sulfate NO32- nitrate SCN-thiocyanate CO32- carbonate OH- hydroxide PO43- phosphate

  20. Ionic Compound Note SheetOn the back of the handout, write the formulas that would result in the positive ions and negative ions forming a compound. Remember, the positive charges must cancel out the negative charges.

  21. This is where parentheses are used. If you have more than one of the polyatomic ions in a formula, use the parentheses. The number on the outside says how many of the polyatomic ions you have.

  22. NH4+1 is called ammoniumNO32- is called nitrateWhen they combine, they form ammonium nitrate. Names are easy.You need 2 NH4+1to cancel out the NO32-

  23. You need 2 NH4+1 to cancel out the NO32- 2 +1 charges cancel out the 1 -2 charge and it’s neutral(NH4)2NO3See? Parentheses are used!

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