1. Building Skills 3 pp. 30-31 Practice Problems

3. For each formula, name the elements present and give the number of atoms of each element. BaF 2

4. ANSWER! Barium (Ba): 1 Fluorine (F): 2

5. For the following equation give an atom inventory: N 2 + 3 H 2  2NH 3

6. Reactants N-2 H-6 Products N-2 H-6

7. For each formula, name the elements present and give the number of atoms of each element. H 2 O 2

8. Hydrogen (H): 2 Oxygen (O): 2

9. For the following equation give a molecule inventory: N 2 + 3H 2  2NH 3

10. One nitrogen molecule & three molecules of hydrogen yields two molecules of ammonia (NH 3 ).

11. For the following equation give an atom inventory: O 2 + 2H 2  2 H 2 O

12. Reactants O-2 H-4 Products O-2 H-4

13. For each formula, name the elements present and give the number of atoms of each element. CaSO 4

14. -Calcium (Ca): 1 -Sulfur (S): 1 -Oxygen (O): 4

15. What are subscripts?

16. The lower case numbers in a formula (the number 2 in H 2 0)

17. For each formula, name the elements present and give the number of atoms of each element. Al 2 SO 4

18. -Aluminum (Al):2 -Sulfur (S):1 Oxygen (O):4

19. For the following equation list the reactants: O 2 + 2 H 2  2 H 2 O

20. O2&H2O2&H2

21. For each formula, name the elements present and give the number of atoms of each element. NH 4 NO 3

22. Nitrogen (N):2 Hydrogen (H):4 Oxygen (O):3

23. What is a coefficent?

24. The large number out in front of a formula (like 2 in front of the 2 H 2 O).

25. For each formula, name the elements present and give the number of atoms of each element. Li 2 CO 3

26. - Lithium (Li): 2 -Carbon (C): 1 -Oxygen (O): 3

27. For the following equation give a molecule inventory: CH 4 +4O 2  CO 2 + 2H 2 O

28. One methane (CH 4 ) and four oxygen molecules yield one carbon dioxide and two water molecules.

29. For each formula, name the elements present and give the number of atoms of each element. (NH 4 ) 3 PO 3

30. -Nitrogen (N): 3 -Hydrogen (H): 12 -Phosphorus (P): 1 -Oxygen (O): 3

31. List the reactants in the following equation: N 2 + 3 H 2  2 NH 3

32. N 2 & H 2

33. 4NH 3 + 7O 2  4NO 2 + 6H 2 O Copy this equation. 1. Underline the coefficients. 2. Circle the molecules.

34. Coefficients: 4NH 3 + 7O 2  4NO 2 +6H 2 O Molecules: NH 3 NO 2 O 2 H 2 0

35. For each formula, name the elements present and give the number of atoms of each element. HC 2 H 3 O 2

36. -Hydrogen (H): 4 -Carbon (C): 2 -Oxygen (O): 2

37. List the products in the following equation: CH 4 + 4O 2  CO 2 + H 2 O

39. For each formula, name the elements present and give the number of atoms of each element. Na 2 O

40. ANSWER! Sodium (Na): 2 Oxygen (O): 1

41. For each formula, name the elements present and give the number of atoms of each element. Al 2 O 3

42. ANSWER! Aluminum (Al): 2 Oxygen (O): 3