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I will require that you show all of your work on practice problems and exams. IDENTIFYING THE NUMBER OF SIG FIGS Determine the correct number of significant figures. 1. 1008 ______ 2. 4.440 ______ 3. 0.0099 ______ 4. 7.0700 ______ 5. 50.05 ______ SIGNIFICANT FIGURES CALCULATIONS Show your answer with the correct number of significant digits. 1. 190.2 g + 65.291 g + 12.38 g = ? 2. 13.78 g 11.3 ml 3. 45.761 g - 42.65 g = 4. 5.761 cm x 6.20 cm = 5. 11.00 m x 12.10 m x 3.53 m = 1. GROUPS (FAMILIES) VS ROWS Which element is in group 7 and row 5 ? _________________ 2. Which element is in group 4 and row 7 ? 3. Which element is in the halogen family and in row 2 ? _________________ 4. Which element is in the alkaline earth metal family and row 6 ? 5. Which element is in the alkali metal family and row 4 ? 1. DIMENSIONAL ANALYSIS How many seconds are in 2.5 hours? ______ 2. How many meters is 33,855 inches? = _________________ ______ _____________ _________________ MONATOMIC/DIATOMIC/POLYATOMIC IONS Determine whether the following ions are monatomic, diatomic or polyatomic. 1. SO4-2 _____________ 2. F2 _____________ 3. NO3-1 _____________ 4. Ca+2 _____________ 5. N-3 _____________ LIST THE 7 DIATOMIC MOLECULES 1. ___________ 4. ___________ 2. ___________ 5. ___________ 3. ___________ 6. ___________ 7. ___________ DISTINGUISH BETWEEN IONIC AND COVALENT COMPOUNDS (circle one) 1. CO2 ionic or covalent 4. PCl5 ionic or covalent 2. CaCO3 ionic or covalent 5. MgCl2 ionic or covalent 3. Fe2(SO4)3 ionic or covalent WRITING CHEMICAL FORMULAS FROM NAMES Write the chemical formula for each chemical name. 1. magnesium sulfate _________________ 2. sulfur trioxide _________________ 3. aluminum chloride _________________ 4. carbon tetrachloride _________________ 5. sodium carbonate _________________ USE THE CRISSCROSS METHOD TO CREATE CHEMICAL FORMULAS 1. Al +3 NO3 -1 _________________ 2. Mg +2 SO4 -2 _________________ 3. NH4 +1 CO 3 -2 _________________ 4. Al +3 5. Li +1 CO 3 -2 PO4 -3 _________________ _________________ NAME IONIC COMPOUNDS 1. BaCO3 _________________ 2. Na3PO4 _________________ 3. B2 (SO4)3 _________________ 4. (NH4)3PO4 _________________ 5. Fe2(CO3)3 _________________ STOCK VS CLASSICAL NAMES Decide whether the chemical formula given is a stock or classical name. Name list stock or classical 1. ferrous sulfate _________________ _________________ 2. copper (II) sulfide _________________ _________________ 3. plumbous sulfate _________________ _________________ 4. iron (II) carbonate _________________ _________________ 5. chromium (III) chloride _________________ _________________ 1. HNO3 NAME ACIDS _________________ 2. H3PO4 _________________ 3. H2 SO4 _________________ 4. H2 SO3 _________________ 5. H2CO3 _________________ BALANCING EQUATIONS Balance the following equations AND determine the type of reaction. Type of Reaction 1. Al (s) + Cl2 (g) → AlCl3 (s) _________________ 2. C4H10 (g) + O2 (g) → CO2 (g) + H2O (g) _________________ 3. Al2O3 (s) + C (s) → Al (l) + CO2 (g) _________________ 4. C2H5OH (l) + O2 → CO2 (g) + H2O (l) _________________ 5. H2S (g) + SO2 (g) → S (s) + H2 (g) + O2 (g) _________________ WRITE BALANCED EQUATIONS FROM WORD EQUATIONS 1. calcium carbonate decomposes into calcium oxide and carbon dioxide gas 2. phosphorous pentachloride mixed with water yields phosphoric acid and hydrochloric acid 3. Sodium hydroxide added to phosphoric acid yields sodium phosphate and water 4. aluminum metal mixed with ferric oxide yields aluminum oxide and iron 5. ammonia added to sulfuric acid yields ammonium sulfate MASS MASS PROBLEMS 1. Tin (II) fluoride is used in some toothpastes. It is made by the reaction of tin with hydrogen fluoride according to the following reaction: Sn (s) + HF (g) → SnF2 (s) + H2 (g) How many grams of SnF2 are produced from the reaction of 30.00g of HF with Sn? LIMITING REACTANT PROBLEMS 1. The black oxide of iron, Fe3O4 , occurs in nature as the mineral magnetite. This substance can also be made in the laboratory by the reaction between red-hot iron and steam according to the following equation: Fe (s) + H2O (g) → Fe3O4 (s) + H2 (g) a. When 36.0g of H2O is mixed with 167g of Fe, which is the limiting reactant? b. What mass in grams of black iron oxide is produced? DISTINGUISH BETWEEN EMPIRICAL AND MOLECULAR FORMULAS 1. H2O empirical or molecular 3. C2H6 empirical or molecular 2. H2O2 empirical or molecular 4. As2O5 empirical or molecular EMPIRICAL FORMULAS 1. Quantitative analysis shows that a compound contains 32.38% sodium, 22.65% sulfur and 44.99% oxygen. Find the empirical formula of this compound. 2. A compound is found to contain 63.52% iron and 36.48% sulfur. Find its empirical formula. MOLECULAR FORMULAS 1. A sample of a compound with a formula mass of 34.00 amu is found to consist of 0.44g H and 6.92g O. Find its molecular formula. 2. If 4.04g of N combine with 11.46g of O to produce a compound with a formula mass of 108.0 amu, what is the molecular formula of this compound? CALCULATING PERCENT YIELD 1. Chlorobenzene, C6H5Cl, is used in the production of many important chemicals, such as aspirin, dyes and disinfectants. One industrial method of preparing chlorobenzene is to react benzene, C6H6 , with chlorine, which is represented by the following equation: C6H6 (l) + Cl2 (g) → C6H5Cl (s) + HCl (g) When 36.8g of C6H6 react with an excess of Cl2, the actual yield of C6H5Cl is 38.8g What is the percent yield of C6H5Cl ? GAS LAWS 1. A scuba diver’s tank contains 0.29 kg of O2 compressed into a volume of 2.3L. a) calculate the gas pressure inside the tank at 9 °C. b) What volume would this oxygen occupy at 26 °C and 0.95 atm? 2. What does STP stand for? _____________________________________________ What are the numeric values? __________________________________________ 3. A mixture containing 2.50 g each of CH4 (g), C2H4 (g), and C4H10 (g) is contained in a 2.00L flask at a temperature of 15 °C. a) Calculate the partial pressure of each of the gases in the mixture. b) Calculate the total pressure of the mixture