Are the following bonds (A) ionic bonds or (B) covalent bonds?

39. O─H 44. N─H

40. N─O 45. Ca─S

41. Na─Cl 46. C─O

42. C─H 47. F─F

43. Mg─Br 48. Ba─F

Ionic bond are formed between a metal and a non metal while covalent bonds are formed between two non metals.

ionic compounds include

Na-cl, Mg-Br, Ca-s, Ba-F (are ionic since their bond is between a metal and non metal)

covalent bonds include

O-H, N-O, C-H, F-F, N-H, C-O, F-F (are covalent since their bond is between two non metal