key concepts in this experiment is the term freezing point depression. The definition of this phrase is that when a solute is dissolved into a solvent‚ their collective boiling point will be less than that of the original boiling point of the solvent. This incidentally leads to another important definition‚ the colligative properties of a solution. This means a particular set of characteristics that are unique to that solution. As the freezing point of the solution decreases‚ the solution then attains
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Do you like salt? Do you put it on your food to make it taste better? Salt doesn’t just make food taste better; it can change the freezing and boiling point of water. I bet you didn’t know that! There’s a reason for that‚ but I’ll explain that a little later. First‚ let’s find out if salt can actually change the freezing and boiling point of water. To do so‚ we need to do an experiment. Now‚ if you’re going to do an experiment‚ you’re going to need a hypothesis. Let’s use mine. I said “if we
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The earth has not always looked the way it looks today. In other words‚ the United States one billion years ago was in a totally different location than it is today!! How does this happen? And why does this happen? Let’s take a look. In order for us to get some understanding of how the earth has changed over time‚ we first need to understand some of the things that took place‚ and are still taking place‚ in the earth. What about the internal structure of the Earth? Our best clues about the interior
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CHM113 summer 2014 Name: __________________________ EXAM 4 SHOW YOUR WORK 1) Of the molecules below‚ the bond in __________ is the least polar. A) HBr B) HI C) HCl D) HF E) H2 2) Ethanol (C2H5OH) melts at -114°C. The enthalpy of fusion is 5.02 kJ/mol. The heat capacity of solid and liquid ethanol are 0.97 J/g-K and 2.3 J/g-K‚ respectively. How much heat (kJ) is needed to convert 25.0 g of solid ethanol at -135°C to liquid ethanol at -50°C? A) 207.3 B) -12.7 C) 6.91 D) 4192 E)
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Crystallization Because chemists always want to get the chemicals they get as pure as possible. And a good way to purify chemicals is to make crystals of them. When they are in solutions you can have all sort of impunities but when they form crystals the crystals contain much purer compounds than in the solution and the impurities are left in the solution. generally the crystal is a very precise arrangement of molecules all the same fitting together like pieces and some sort of construction
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Melting Points Elizabeth McGrail Organic Chemistry I 25 January 2013 ABSTRACT The objectives of this lab are‚ as follows; to understand what occurs at the molecular level when a substance melts; to understand the primary purpose of melting point data; to demonstrate the technique for obtaining the melting point of an organic substance; and to explain the effect of impurities on the melting point of a substance. Through the experimentation of three substances‚ tetracosane‚ 1-tetradecanol and
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Ideally‚ the percent yield should be 100%‚ as this means that you have recovered 100% of that material. A yield over 100% would mean that the substance still has some traces of another material that is adding additional mass. Ex. The iron filings having some sand particles leftover. A yield under 100% would mean that some of the substance was not recovered‚ it could have been lost (spilled) or found in another substance (not separated completely). The percent yields may give some insight into what
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Department of Chemistry [Colligative Properties & Osmotic Pressure] Purpose : The experiment this week had two different purposes. The first is to teach us about freezing points. This lab was designed to show us the freezing point of a pure solvent‚ in comparison to a solvent in a solution with a non-volatile solute. The second goal of the experiment is to teach students about osmosis. In the experiment‚ we got to observe osmosis as well as understand dialysis
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water that will turn into ice and see what chemical reaction does different types of salt have on the ice. Salt melts ice mainly because adding salt lowers the freezing point of the water. Pure water freezes at 32°F (0°C). Water with salt (or any other substance in it) will freeze at some lower temperature. The normal freezing point of water is 0 degrees Celsius‚ so if the temperature is above that then ice will melt. When salt and water are mixed together‚ the salt dissolves‚ which means the salt
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cup water in each 2. Take one teaspoon of salt and mix it in one of cups 3. Put both cups in the freezer 4. Observe. Conclusion: When salt is added to water it slows the freezing process down‚ therefore the freezing point of tap water is higher than the freezing point of salt water. Hypothesis: If... ‚ then... Materials: 1. 2 Plastic cups 2. Tap Water 3. Teaspoon 4. Bag of salt 5. Freezer 6. Clock 7. Paper 8. Pencil Procedures: 1. Take your plastic
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