Question

1. determine if the following compounds are ionic (i) or covalent (c).

a) $\text{cacl}_2$ b. $\text{nai}$ c. $\text{co}_2$ d. $\text{nh}_3$

1. na and o 2) k and f 3) co 4) fe and cu

Explanation:

Step1: Identify ionic/covalent rules

Ionic = metal + nonmetal; Covalent = nonmetal + nonmetal.

Step2: Analyze 2a: $\text{CaCl}_2$

Ca (metal) + Cl (nonmetal) → Ionic

Step3: Analyze 2b: $\text{NaI}$

Na (metal) + I (nonmetal) → Ionic

Step4: Analyze 2c: $\text{CO}_2$

C (nonmetal) + O (nonmetal) → Covalent

Step5: Analyze 2d: $\text{NH}_3$

N (nonmetal) + H (nonmetal) → Covalent

Step6: Analyze 3.1: Na and O

Na (metal) + O (nonmetal) → Ionic

Step7: Analyze 3.2: K and F

K (metal) + F (nonmetal) → Ionic

Step8: Analyze 3.3: CO

C (nonmetal) + O (nonmetal) → Covalent

Step9: Analyze 3.4: Fe and Cu

Fe (metal) + Cu (metal) → Metallic (not ionic/covalent, but per prompt framing, note the pair forms metallic bonds; but if restricted to I/C, clarify it's neither, but follow prompt's options)

Answer:

1. a) $\text{CaCl}_2$: I (Ionic)

b) $\text{NaI}$: I (Ionic)
c) $\text{CO}_2$: C (Covalent)
d) $\text{NH}_3$: C (Covalent)

1. 1) Na and O: I (Ionic)
2. K and F: I (Ionic)
3. CO: C (Covalent)
4. Fe and Cu: Neither (forms metallic bonds, not ionic/covalent)