Chem 178L Week 1 ELN
Chem 178L Week 1 ELN 178L
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This 3 page Class Notes was uploaded by Harper Emswiler on Tuesday July 19, 2016. The Class Notes belongs to 178L at Iowa State University taught by Pistolesi, S. in Spring 2016. Since its upload, it has received 13 views. For similar materials see Chem 178L in Chemistry at Iowa State University.
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Date Created: 07/19/16
CHEM 178L Spring 2016 - Harper Emswiler Weekly Notes/Week 1 PDF Version generated by Harper Emswiler on Jan 13, 2016 @01:17 PM CST Table of Contents Table of Contents 1 Week 1 2 Week 1/ 2 of 3 Week 1 Harper Emswiler Jan 10, 2016 @08:59 PM CST WEEK 1 Harper Emswiler Jan 11, 2016 @09:36 AM CST Prelab Entry Harper Emswiler Jan 11, 2016 @09:36 AM CST Procedure 1. Gather all important glassware 1. test tubes 2. Fill half test tube with water 3. Use plastic dropper to fill with ethanol Safety Water: nothing special Ethanol: flammable- keep away from flames/heat Volatile smell- store open containers in hood wear PPE Investigation Questions 1. What happens when you mix ethanol with water? 1. I think either nothing will happen OR it'll evaporate/boil the water Harper Emswiler Jan 11, 2016 @09:49 AM CST Procedure Harper Emswiler Jan 11, 2016 @09:48 AM CST arrived in lab Summary of Prelab Discussion - repeats info that you should have done for the prelab entry - Would include changes in procedure Observations Upon adding ethanol to a test tube wtih distilled water, at first the water looked all wavey, almost like there were vapors moving through the water. I shook the test tube a bit and the waves went away and became tiny bubbles. Doesn't really smell like anything, mainly just ethanol. The liquid remained clear, no noticeable change in color or density. Sounds normal. Harper Emswiler Jan 11, 2016 @09:49 AM CST Post Lab Discussion Harper Emswiler Jan 11, 2016 @09:53 AM CST Some didn't observe anything, some saw a 'mirage'/membrane/meniscus (what I called 'waves'). Harper Emswiler Jan 13, 2016 @12:51 PM CST Analysis Questions Part 1C Week 1/ 3 of 3 Harper Emswiler Jan 13, 2016 @12:59 PM CST 1. Example 2 gives the best explanation of what was done and what happened. 2. Example 1 leaves out: Amount of water that was used, equipment that was used, size of beaker that was used,beginning observations, observations as the experiment is taking place, setting of bunsen burner, what is being done to the water, and the time it took to see a change happen. 3. Example 2 tells us that a beaker was used, the size of the beaker, the amount of water that was used, what we did to the water (heated it), what the water/ watch glass looked like before we heated it, what it looked like while we heated it, how we heated it, and the time it took to see a change happen. 4. (We didn't do this as a class) I would guess that some important things to keep in mind while recording observations are: use as much detail as possible, numbers are good, record observations of experiment before, during, and after stuff happens, record the time it takes for something to happen. Harper Emswiler Jan 13, 2016 @01:00 PM CST Reflective Writing Harper Emswiler Jan 13, 2016 @01:16 PM CST Explain Investigation Question: "What happens when you mix ethanol with water?" When you mix ethanol with water, wave-like 'mirages' appear within the liquid. This is visible when you hold the liquid up to a light. The color, temperature, and density don't change noticeably. This could be explained by what happens when the different atoms of H2O and ethanol mix. I'm not exactly sure what chemical reaction/ mixing takes place, but it allows you to see little ethanol vapors. Evaluate My explanation for what happened when we mixed ethanol and water makes sense based on what we have previously learned in chemistry lecture because I know that something has to happen when you mix ethanol and water. That being said, there wasn't a huge explosion or anything like that, but I knew something had to happen. I'm still not sure exactly what causes the mirage. Most of the class saw the 'mirage', however some people didn't. This is because I don't think everyone knew they had to hold the mixture up to a light in order to see it. It's pretty hard to see. Especially when you don't know what you're looking for. I think this could be fixed by making sure that everyone knew that they have to hold the mixture up to a light in order to see the mirage instead of just suggesting it. Extend This experiment reminds me of the time I dumped nail polish remover into a bowl of water to let my hands soak in before I removed some nail polish. I saw the same mirage when I poured the nail polish remover into the water. That being said, the reaction between the water and nail polish remover wasn't spectacular enough for me to investigate. Harper Emswiler Jan 11, 2016 @09:54 AM CST Analysis questions answered here
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