Chapter 2 Atoms, Molecules and Ions
1. The following data were collected for several compounds of nitrogen and oxygen:
If compound X has an equal number of oxygen and nitrogen atoms, what is the most likely
formula for compound Y?
a) NO
b) NO2
c) N2O
d) N2O5
2. Which of the following equation satisfies the law of conservation of mass?
3. Which of the following is a correct representation of the reaction:
2H2(g) + O2(g) 2H2O(g)
4. Which of the following combination of elements is likely to produce an ionic bond?
a) Li and Cl
b) Li and Rb
c) N and S
d) N and O
Name the following:
5. Ba(NO3)2 ________________________________
Chapter 2 Atoms, Molecules and Ions
6. CH4 ________________________________
7. HBr ________________________________
8. Cu(OH)2 ________________________________
9. H2CrO4 ________________________________
10. Hg2SO4 ________________________________
11. SF6 ________________________________
12. HNO2 ________________________________
13. NH4HCO3 ________________________________
14. H2CO3 ________________________________
15. Pb(C2H3O2)2 ________________________________
16. HgSO3 ________________________________
17. OF2 ________________________________
18. NH3 ________________________________
19. Cu3(PO4)2 ________________________________
20. HNO3 ________________________________
21. BaSO3 ________________________________
22. KMnO4 ________________________________
23. K2Cr2O7 ________________________________
24. CuI ________________________________
25. H2SO4 ________________________________
26. Mg(HCO3)2 ________________________________
27. N2O3 ________________________________
Write the formula:
28. Magnesium hydroxide ________________________________
29. Dinitrogen tetroxide ________________________________
30. Hydrofluoric acid ________________________________
31. Arsenic Pentachloride ________________________________
32. Sulfuric acid ________________________________
33. Sulfurous acid ________________________________
34. Hydrosulfuric acid ________________________________
35. Mercury I iodide ________________________________
Chapter 2 Atoms, Molecules and Ions
36. Mercury II iodide ________________________________
37. Barium phosphate ________________________________
38. Phosphoric acid ________________________________
39. Tricarbon octahydride ________________________________
40. Hydroiodic acid ________________________________
41. Silver nitrate ________________________________
42. Ammonium chloride ________________________________
43. Oxalic acid ________________________________
44. Carbon tetrachloride ________________________________
45. Potassium nitrate ________________________________
46. Acetic acid ________________________________
47. Magnesium sulfate ________________________________
Symbol Number of protons in
nucleus
Number of neutrons in
nucleus
Number of
electrons
Net
charge
23892 U
92 146 92 0
4020 Ca2+
20 20 18 2+
5123 V3+
23 28 20 3+
Chapter 2 Atoms, Molecules and Ions
8939 Y
39 50 39 0
Br7935 35 44 36 1−
3P3115 15 16 18 3−
Chapter 2 Atoms, Molecules and Ions