Question

1. identify the binary compound(s) from the following list:

. bas, nahco₃, na₂co₃, kcl, naf, ca₃p₂, rb₂hpo₄

1. write the formula for the following:

a) barium nitride
b) aluminum iodide
c) potassium sulfide

1. what is the octet rule?
2. what is wrong with this name: oxygen calcide?
3. identify the ionic compounds from the list: pbcl₂ na₂o pcl₅ so₃ rbcl

Explanation:

1. Binary Compounds Identification

Step1: Recall binary compound definition

A binary compound is a compound composed of two different elements.

Step2: Analyze each compound

• \(BaS\): Composed of \(Ba\) (barium) and \(S\) (sulfur) → binary.
• \(NaHCO_3\): Composed of \(Na\), \(H\), \(C\), \(O\) → not binary.
• \(Na_2CO_3\): Composed of \(Na\), \(C\), \(O\) → not binary.
• \(KCl\): Composed of \(K\) (potassium) and \(Cl\) (chlorine) → binary.
• \(NaF\): Composed of \(Na\) and \(F\) (fluorine) → binary.
• \(Ca_3P_2\): Composed of \(Ca\) (calcium) and \(P\) (phosphorus) → binary.
• \(Rb_2HPO_4\): Composed of \(Rb\), \(H\), \(P\), \(O\) → not binary.

a) Barium nitride

Step1: Determine ion charges

Barium (\(Ba\)) has a charge of \(+2\), nitride (\(N^{3 -}\)) has a charge of \(- 3\).

Step2: Use charge - balance

To balance charges, formula is \(Ba_3N_2\) (since \(3\times(+2)+2\times(-3)=0\)).

b) Aluminum iodide

Step1: Determine ion charges

Aluminum (\(Al\)) has a charge of \(+3\), iodide (\(I^-\)) has a charge of \(-1\).

Step2: Use charge - balance

Formula is \(AlI_3\) (\(1\times(+3)+3\times(-1)=0\)).

c) Potassium sulfide

Step1: Determine ion charges

Potassium (\(K\)) has a charge of \(+1\), sulfide (\(S^{2 -}\)) has a charge of \(-2\).

Step2: Use charge - balance

Formula is \(K_2S\) (\(2\times(+1)+1\times(-2)=0\)).

The octet rule states that atoms tend to gain, lose, or share electrons to have eight electrons in their valence shell, achieving a stable electron configuration similar to noble gases.

Answer:

\(BaS\), \(KCl\), \(NaF\), \(Ca_3P_2\)

2. Formula Writing