Suzi - Final Outline - Chem 14 Review 1. Define polar...

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Chem 14 Review 1. Define polar molecule Molecules that have a dipole moment 2. Redox Reaction The oxidation of a chemical reaction causing oxidation states to change. One on increases and the other decreases in oxidation level. 3. Describe in detail how you would make up a 0.01 M solution of Na 2 SO 4 , using a 250 mL volumetric flask. First find the mass of one mole of Na 2 SO 4 by using stoichiometry which is 142.04g Na 2 SO 4. Then convert 0.01M Na 2 SO 4 to grams per liter. From there set up the ratio (1.4204g)/(1L) = (x grams)/(1L). x then equals .3551g. From there place the substance in a bottle that can hold more than 250mL. Then slowly filly the container to 250 mL. 4. Why is distilled water more expensive than tap water? Distilled water is more expensive because it is strictly H 2 O. The water is boiled and the evaporation is collected. The evaporation is pure H 2 O and there are no trace elements in it. If there are other elements in the water, it would throw off out chemical reactions. 5. A student takes a blue dye solution and does a serial dilution in a 1x5 well strip. In a second 1x5 strip, the same thing is repeated except distilled water is not added to any of the wells. When both strips are viewed from the top, which well will match. Well one of strip 1 will match well 5 of strip two. Well 2 of strip one will match with well 4 of strip two and so forth. This is due to Beers Law. As the path of light increases in strip two, and the concentration of strip one increases then the wells will match. 6. What is meant by “good transfer technique?” Include the purpose of each step. Good transfer technique requires a dropper to be initially rinsed with distilled water. Then a small amount is drawn of a certain substance, swished around, and put into waste. This prevents the desired substance from becoming polluted. Then a good amount of the substance is drawn and when dropped, the dropper remains in the same angle. 7. A substance has a red color. What color of light is absorbed by the substance Blueish green light is absorbed 8. If a student adds 15 mL of distilled water to a beaker containing 75 mL of 0.215 M solution and stirs, what is the concentration of the resulting solution? C 1 V 1 = C 2 V 2 (15mL) (x) = (75mL) (0.215M) 0.18 M 9. In Section H, you were asked to design an experiment to determine the ration of two dyes present in lime Kool-Aid. Briefly describe the experiment you designed on the back of this sheet. We used colorimetry to find the ratio of powder to water. We set up a beaker with a certain molarity of the Kool-Aid. We added 10 drops of blue solution to well one, 9 to well two and so on.we then added yellow dye to the strip, 1 in well two 2 in well 3 and so on. Then we held up the strip to the Kook-Aid solutions and found the matching concentration. Exp 7
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This note was uploaded on 09/23/2008 for the course CHEM 111 taught by Professor Keiser,josephthoheckman,kimberlyproia,michaelantsanders,rebeccalo'neill,ryanshaw during the Fall '07 term at Pennsylvania State University, University Park.

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Suzi - Final Outline - Chem 14 Review 1. Define polar...

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