1. APPLIED CHEMISTRY MIDTERM PROBLEMS REVIEW

2. QUESTION 1 What is the atomic number and chemical symbol for osmium?

3. QUESTION 2 Which is larger?milligramhectogramkilogramdecigram

4. QUESTION 3 How many centiseconds are in a second?

5. QUESTION 4 Write 0.0005321 in scientific notation.

6. QUESTION 5 Write 2.33 x 10 5 in regular notation.

7. QUESTION 6 Fill in the table ProtonsElectrons Cu +1 Cu +2 ProtonsElectrons Cu +1 Cu +2 GROUP 1GROUP 2

8. QUESTION 7 How many oxygen atoms are in the compound Ca(C 2 H 3 O 2 ) 2 ?

9. QUESTION 8 What is the molar mass of Mg(OH) 2 ?

10. QUESTION 9 How many grams of carbon dioxide are in 1 mole of carbon dioxide?

11. QUESTION 10 How many moles are in 123 grams of lead metal?

12. QUESTION 11 How many moles are in 6.02 x 10 23 molecules of N 2 ?

13. QUESTION 12 Balance this chemical equation: ___P 4 +___O 2  ___P 2 O 5

14. QUESTION 13 In the equation 2Fe 2 O 3 + 3CO  4H 2 O + 3CO 2 _____ moles of iron(III) oxide react with carbon monoxide to form ___ moles of water and ____ moles of carbon dioxide.

15. QUESTION 14 A toy car has a mass of 15 grams. How many pounds is this if 1 lb = 454 g?

16. QUESTION 15 A recipe calls for 2.50 L of milk. How many gallons is this if 1 L = 1.06 qt and 1 gallon = 4 qts?

17. QUESTION 16 A piece of metal has the following dimensions: length = 1.25 cm; width = 1.00 cm; height = 2.34 cm. The mass of the metal is 26.2 g. If density=mass/volume, what is the density of the metal?

18. QUESTION 17 What is the percent composition by mass of oxygen in AlPO 4 ?

19. QUESTION 18 When sodium phosphate, Na 3 PO 4, reacts with barium chloride, BaCl 2, the products are barium phosphate, Ba 3 (PO 4 ) 2, and sodium chloride, NaCl. Write the balanced chemical equation for this reaction.

20. QUESTION 19 According to this equation: 2Na 3 PO 4 + 3BaCl 2  Ba 3 (PO 4 ) 2 + 6NaCl How many moles of barium chloride are necessary to produce 1.25 moles of barium phosphate?

21. QUESTION 20 How many grams are in 0.765 mole of copper(II) sulfate, CuSO 4 ?