Question

classify the following compounds as ionic, or covalent
hint: if the first element is a metal the compound is ionic!

formula	type of compound	formula	type of compound
co₂		nh₄cl
h₂o		hcl
baso₄		ki
k₂o		naoh
naf		no₂
naf		alpo₄
na₂co₃		fecl₃
ch₄		p₂o₅
so₃		n₂o₃
libr		caso₄

Explanation:

Step1: Identify ionic/covalent via metal rule

Ionic: Contains metal (or $NH_4^+$); Covalent: Nonmetals only.

Step2: Classify each compound one by one

1. $CaCl_2$: Ca (metal) → Ionic
2. $CO_2$: C, O (nonmetals) → Covalent
3. $H_2O$: H, O (nonmetals) → Covalent
4. $BaSO_4$: Ba (metal) → Ionic
5. $K_2O$: K (metal) → Ionic
6. $NaF$: Na (metal) → Ionic
7. $NaF$: Na (metal) → Ionic
8. $Na_2CO_3$: Na (metal) → Ionic
9. $CH_4$: C, H (nonmetals) → Covalent
10. $SO_3$: S, O (nonmetals) → Covalent
11. $LiBr$: Li (metal) → Ionic
12. $MgO$: Mg (metal) → Ionic
13. $NH_4Cl$: $NH_4^+$ (ionic cation) → Ionic
14. $HCl$: H, Cl (nonmetals) → Covalent
15. $KI$: K (metal) → Ionic
16. $NaOH$: Na (metal) → Ionic
17. $NO_2$: N, O (nonmetals) → Covalent
18. $AlPO_4$: Al (metal) → Ionic
19. $FeCl_3$: Fe (metal) → Ionic
20. $P_2O_5$: P, O (nonmetals) → Covalent
21. $N_2O_3$: N, O (nonmetals) → Covalent
22. $CaSO_4$: Ca (metal) → Ionic

Answer:

Formula	Type of Compound	Formula	Type of Compound
$CO_2$	Covalent	$NH_4Cl$	Ionic
$H_2O$	Covalent	$HCl$	Covalent
$BaSO_4$	Ionic	$KI$	Ionic
$K_2O$	Ionic	$NaOH$	Ionic
$NaF$	Ionic	$NO_2$	Covalent
$NaF$	Ionic	$AlPO_4$	Ionic
$Na_2CO_3$	Ionic	$FeCl_3$	Ionic
$CH_4$	Covalent	$P_2O_5$	Covalent
$SO_3$	Covalent	$N_2O_3$	Covalent
$LiBr$	Ionic	$CaSO_4$	Ionic