Question

regular chemistry
name: savannah jackson date: 10/10 class: 4th
unit 2 - hw 3 -
ws 2: ionic bonding with transition metals and polyatomic ions
make sure you use the criss cross method correctly, and use the naming rules to name correctly.

• metal names stay the same
• nonmetals must get the suffix of -ide
• transition metals (groups 3 - 12) must have roman numerals in their name
• chromium (ii) → (ii) tells you that this chromium has a +2 charge
• you can figure out the charge of the transition metal by completing the criss cross method backwards. the subscript on the nonmetal would become the charge for the transition metals
• polyatomic ions are units, and should not be separated.
• use your reference sheet to figure out the name or formula for the polyatomic ion.
• if there are multiples of the polyatomic ion, put the polyatomic ion in parentheses

to complete the table below:

• you will break into your lab groups.
• at each station are 4 cards with names on them and numbers. those numbers correspond to the question name on the table below.
• complete the compound using the cards at the stations. determine the formula and compound name for each.

metal or transition metal	nonmetal or polyatomic ion	formula	compound name
2. calcium		cacl₂	calcium chloride
3. copper (ii)
4. lead (iv)
	5. nitride
	6. borate
	7. iodide
	8. sulfite

Explanation:

Step1: Recall ion - charge rules

Sodium has a +1 charge ($Na^+$) and chloride has a - 1 charge ($Cl^-$). Using the criss - cross method, the formula is $NaCl$ and the name is sodium chloride.

Step2: Determine calcium - chloride formula

Calcium has a +2 charge ($Ca^{2 + }$) and chloride has a - 1 charge ($Cl^-$). By criss - cross, the formula is $CaCl_2$ and the name is calcium chloride.

Step3: Find copper(II) - chloride formula

Copper(II) has a +2 charge ($Cu^{2+}$) and chloride has a - 1 charge ($Cl^-$). Using criss - cross, the formula is $CuCl_2$ and the name is copper(II) chloride.

Step4: Calculate lead(IV) - chloride formula

Lead(IV) has a +4 charge ($Pb^{4+}$) and chloride has a - 1 charge ($Cl^-$). By criss - cross, the formula is $PbCl_4$ and the name is lead(IV) chloride.

Step5: For nitride

If we consider a metal like sodium (for example, sodium has a +1 charge), nitride ($N^{3 - }$). Using criss - cross, the formula with sodium would be $Na_3N$ and the name is sodium nitride.

Step6: For borate

Let's assume a metal like sodium again. Sodium has a +1 charge and borate ($BO_3^{3 - }$). The formula is $Na_3BO_3$ and the name is sodium borate.

Step7: For iodide

If we take potassium (with a +1 charge) as an example, iodide has a - 1 charge ($I^-$). The formula is $KI$ and the name is potassium iodide.

Step8: For sulfite

If we consider sodium (with a +1 charge), sulfite ($SO_3^{2 - }$). Using criss - cross, the formula is $Na_2SO_3$ and the name is sodium sulfite.

Answer:

Metal or Transition Metal	Nonmetal or Polyatomic Ion	Formula	Compound Name
2. Calcium	Chloride	$CaCl_2$	Calcium chloride
3. Copper (II)	Chloride	$CuCl_2$	Copper(II) chloride
4. Lead (IV)	Chloride	$PbCl_4$	Lead(IV) chloride
	5. Nitride	$Na_3N$ (using sodium as an example)	Sodium nitride
	6. Borate	$Na_3BO_3$ (using sodium as an example)	Sodium borate
	7. Iodide	$KI$ (using potassium as an example)	Potassium iodide
	8. Sulfite	$Na_2SO_3$ (using sodium as an example)	Sodium sulfite