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Forming Ionic Compounds Adrena McDonald Venture Alternative High School

Forming Ionic Compounds Adrena McDonald Venture Alternative High School. Before We Begin. Cut out the ions from your student worksheets. Have a glue stick ready to attach the ions to your compound worksheet. Now, let’s do a couple together. B +3. Boron (B +3 ) + Chlorine (Cl -1 )

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Forming Ionic Compounds Adrena McDonald Venture Alternative High School

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  1. Forming Ionic CompoundsAdrena McDonaldVenture Alternative High School

  2. Before We Begin • Cut out the ions from your student worksheets. • Have a glue stick ready to attach the ions to your compound worksheet. • Now, let’s do a coupletogether.

  3. B+3 • Boron (B+3) + Chlorine (Cl-1) • 1 boron atom for every 3 chlorine atoms • 1. BCl3 Cl-1 Cl-1 Cl-1 boron chloride BCl3

  4. 2. Magnesium (Mg+2) + Chlorine (Cl-1) 1 magnesium atom for every 2 chlorine atoms 2. MgCl2 Cl-1 Cl-1 Mg+2 magnesium chloride MgCl2

  5. Now, it’s your turn. Do the remaining problems on your own. Then view the remainder of the slides.

  6. Boron (B+3) + Chlorine (Cl-1)  boron chloride • You can also determine the formula for a compound using the “criss-cross” method. Take the numbers from the ions’ superscripts and cross them to become the subscripts in the compound. Look at question #1. B+3 Cl-1 3 1 B Cl 3 1 BCl3

  7. Magnesium (Mg2+) + Nitrogen (N-3) Magnesium nitride • Here’s another example of using the criss-cross method. Mg+2 N-3 2 3 Mg N 2 3 Mg3N2

  8. Potassium (K+1) + Sulfate (SO4-2)  potassium sulfate • This also works for polyatomic ions. K+1 (SO4)-2 1 2 K (SO4) Parentheses are not used unless a subscript is needed after the polyatomic ion, as you will see in the next example. K2SO4

  9. Aluminum (Al+3) + Sulfate (SO4-2) aluminum sulfate • Use parentheses to indicate that more than one of the same polyatomic ion is included in the compound. Al+3 (SO4)-2 3 2 Al (SO4) Al2(SO4)3

  10. If the superscript charges add to zero, DO NOT criss-cross. All compounds have a zero charge, so it takes one of each ion to make the compound: • Ca+2 + O-2CaO • B+3 + N-3 BN (+2 and -2 = 0) (+3 and -3 = 0)

  11. Released TAKS Question calcium (Ca+2) + chlorine (Cl-1)  calcium chloride The chemical formula for calcium chloride is --- A) Ca2Cl B) CaCl C) CaCl2 D) Ca2Cl3 Ca+2Cl-1 2 1 Ca Cl 2 1 CaCl2

  12. Released TAKS Question Al3+ SO42- According to this information, what is the chemical formula for aluminum sulfate? A) AlSO4 B) Al2(SO4)3 C) Al3(SO4)2 D) Al6SO4 Al+3 (SO4)-2 3 2 Al (SO4) Al2(SO4)3

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