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Chapter 6 post-mortem

Chapter 6 post-mortem. 1. How many atoms in calcium phosphate?. 1. How many atoms in calcium phosphate?. Balance formula: Ca +2 , PO 4 -3 Ca 3 (PO 4 ) 2 3 calcium atoms 2 phosphate ions (each has 5 atoms) 13 total atoms. 2. Write the formula for cuprous sulfate.

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Chapter 6 post-mortem

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  1. Chapter 6 post-mortem

  2. 1. How many atoms in calcium phosphate?

  3. 1. How many atoms in calcium phosphate? Balance formula: Ca+2 , PO4-3 Ca3(PO4)2 3 calcium atoms 2 phosphate ions (each has 5 atoms) 13 total atoms

  4. 2. Write the formula for cuprous sulfate.

  5. 2. Write the formula for cuprous sulfate. Sulfate, SO4 , has a charge of -2 Cuprous is copper with a charge of +1 (cupric is copper with a +2 charge) We need 2 cuprous ions to balance the charge of sulfate Cu2SO4

  6. 3. Name this compound (classical). FeSO4

  7. 3. Name this compound (classical). FeSO4 Iron has two charges: Ferrous is Fe+2 Ferric is Fe+3 We need the +2 iron ion to balance the charge of the -2 sulfate ion Ferrous sulfate

  8. 4. Name this compound. C2F3

  9. 4. Name this compound. C2F3 This compound is molecular, because there are no metals, so we use prefixes: Di is two Tri is three Dicarbontrifluoride

  10. 5. Write the formula for dinitrogentetrafluoride.

  11. 5. Write the formula for dinitrogentetrafluoride. Nitrogen and fluorine are not metals, so this compound is molecular Two nitrogen atoms Four fluoride atoms N2F4

  12. 6. Write the formula for lithium sulfite.

  13. 6. Write the formula for lithium sulfite. Lithium ion is Li+1 Sulfite ion is SO3-2 We need two lithium ions to balance the charge of the sulfite ion Li2SO3

  14. 7. How many electrons in a lithium ion?

  15. 7. How many electrons in a lithium ion? Lithium atom has three electrons It loses one when it becomes an ion 2

  16. 8. How many electrons in a ferric ion?

  17. 8. How many electrons in a ferric ion? Iron atom has 26 electrons The ferric ion has a +3 charge (it has lost three electrons) 23

  18. 9. What chemical groups have 2 charges?

  19. 9. What chemical groups have 2 charges? Group B atoms (transition elements) form ions with multiple charges Group B

  20. 10. Write the formula and charge for the ammonium ion.

  21. 10. Write the formula and charge for the ammonium ion. Ammonium ion is the one polyatomic ion with a positive charge By memory NH4+1

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