APPLIED CHEMISTRY MIDTERM PROBLEMS REVIEW QUESTION 1 What is the atomic number and chemical symbol for osmium? QUESTION 2 Which is larger? milligram hectogram kilogram decigram milligram hectogram kilogram decigram QUESTION 3 How many centiseconds are in a second? QUESTION 4 Write 0.0005321 in scientific notation. QUESTION 5 Write 2.33 x 105 in regular notation. QUESTION 6 Fill in the table GROUP 1 Protons Electrons GROUP 2 Protons Electrons Cu+1 Cu+1 Cu+2 Cu+2 QUESTION 7 How many oxygen atoms are in the compound Ca(C2H3O2)2? QUESTION 8 What is the molar mass of Mg(OH)2? QUESTION 9 How many grams of carbon dioxide are in 1 mole of carbon dioxide? QUESTION 10 How many moles are in 123 grams of lead metal? QUESTION 11 How many moles are in 6.02 x 1023 molecules of N2? QUESTION 12 Balance this chemical equation: ___P4 +___O2 ___P2O5 ___P4 +___O2 ___P2O5 QUESTION 13 In the equation 2Fe2O3 + 3CO 4H2O + 3CO2 _____ moles of iron(III) oxide react with carbon monoxide to form ___ moles of water and ____ moles of carbon dioxide. _____ moles of iron(III) oxide react with carbon monoxide to form ___ moles of water and ____ moles of carbon dioxide. QUESTION 14 A toy car has a mass of 15 grams. How many pounds is this if 1 lb = 454 g? 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? 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? QUESTION 17 What is the percent composition by mass of oxygen in AlPO4? QUESTION 18 When sodium phosphate, Na3PO4, reacts with barium chloride, BaCl2, the products are barium phosphate, Ba3(PO4)2, and sodium chloride, NaCl. Write the balanced chemical equation for this reaction. QUESTION 19 According to this equation: 2Na3PO4 + 3BaCl2 Ba3(PO4)2 + 6NaCl How many moles of barium chloride are necessary to produce 1.25 moles of barium phosphate? QUESTION 20 How many grams are in 0.765 mole of copper(II) sulfate, CuSO4?