Question

name: teacher: schools q2 chemistry: u4l12 polyatomic ions date: prepwork part 1: box your final answer if there is other work shown. 1. write the chemical formulas for the following ionic compounds. a. *lithium phosphate e. hydronium acetate b. *gallium sulfate f. magnesium chlorite c. calcium hydrogen carbonate g. ammonium phosphide d. potassium dichromate h. potassium thiocyanate 2. write the chemical names for the following ionic compounds. a. *cac₂o₄ e. caso₃ b. *mg(oh)₂ f. sr₃as₂ c. **nano₂ g. ga(oh)₃

Explanation:

Part 1: Writing Chemical Formulas

a. Lithium Phosphate

Step1: Identify ions.

Lithium ion: $Li^+$; Phosphate ion: $PO_4^{3-}$.

Step2: Balance charges.

3 $Li^+$ (total +3) balance 1 $PO_4^{3-}$ (total -3).

Step3: Write formula.

$Li_3PO_4$

b. Gallium Sulfate

Step1: Identify ions.

Gallium(III) ion: $Ga^{3+}$; Sulfate ion: $SO_4^{2-}$.

Step2: Balance charges.

2 $Ga^{3+}$ (total +6) balance 3 $SO_4^{2-}$ (total -6).

Step3: Write formula.

$Ga_2(SO_4)_3$

c. Calcium Hydrogen Carbonate

Step1: Identify ions.

Calcium ion: $Ca^{2+}$; Hydrogen carbonate ion: $HCO_3^-$.

Step2: Balance charges.

1 $Ca^{2+}$ (total +2) balance 2 $HCO_3^-$ (total -2).

Step3: Write formula.

$Ca(HCO_3)_2$

d. Potassium Dichromate

Answer:

Step1: Identify ions.

$Ga^{3+}$ (gallium(III) ion); $OH^-$ (hydroxide ion).

Step2: Combine names.

Gallium(III) Hydroxide

Final Answers (Part 1)

a. $\boldsymbol{Li_3PO_4}$
b. $\boldsymbol{Ga_2(SO_4)_3}$
c. $\boldsymbol{Ca(HCO_3)_2}$
d. $\boldsymbol{K_2Cr_2O_7}$
e. $\boldsymbol{H_3OC_2H_3O_2}$ (or $\boldsymbol{H_3O(C_2H_3O_2)}$)
f. $\boldsymbol{Mg(ClO_2)_2}$
g. $\boldsymbol{(NH_4)_3P}$
h. $\boldsymbol{KSCN}$

Final Answers (Part 2)

a. $\boldsymbol{Calcium\ Oxalate}$
b. $\boldsymbol{Magnesium\ Hydroxide}$
c. $\boldsymbol{Sodium\ Nitrite}$
e. $\boldsymbol{Calcium\ Sulfite}$
f. $\boldsymbol{Strontium\ Arsenide}$
g. $\boldsymbol{Gallium(III)\ Hydroxide}$