Elemental Composition of Pure Substances Video #1 1. Besides the two examples in the video, give another example to illustrate what a “fixed ratio” means. 2. Is sucrose a pure substance? Why or why not? 3. Pause the video at 2:49 and attempt the problem, and show your work here. What is the percent composition by mass of N2O4? 4. Pause the video and fill in these definitions: Term Definition Example Empirical Formula Molecular Formula 5. Can the empirical and molecular formula be the same? 6. Pause the video at 6:17 and attempt the problem. What are the empirical formulas of H2O2, Na2SO4, and C2H4O2? Video #2 1. Pause the video at 0:50 and attempt the problem. Show your work here. A compound was analyzed and found to contain 13.5 g Ca, 10.8 g O, and 0.675 g H. What is the empirical formula of the compound? 2. Pause the video at 3:15 and attempt the problem, showing your work here. A compound is determined to be 43.6% P and the remainder oxygen. What is the empirical formula of the compound? 3. Pause the video at 5:25 and attempt the problem, then evaluate how you did and identify any errors. What is the empirical formula of a compound that is 28.7% K, 1.5% H, 22.8% P, and 47.0% O? Video #3 1. What is a Hydrate analysis? 2. Pause the video at 1:08 and try to solve the problem. Show your work here. 3. Pause the video at 2:11 and read the problem. A hydrate is a compound in which water molecules are chemically bound to another compound. An example would be CoCl2•6H2O. When heated, the water molecules evaporate. Copy the calculations for part b here: 3. Pause the video at 6:00 and attempt the problem, then evaluate how you did and identify any errors. Show your work here. 4. Pause the video at 7:41 and attempt the problem, then evaluate how you did and identify any errors. Show your work here.

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