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Question 9Status: Partial credit Points earned: 0.50/1.00What can an understanding of concentration help you do?Select one or more:Analyze the molecular structure o...

Question

Question 9Status: Partial credit Points earned: 0.50/1.00What can an understanding of concentration help you do?Select one or more:Analyze the molecular structure of pure crystalline solidControl the amount of sanitizing chemicals in poolProvide the correct amount of medication in liquid medicinePredict the boiling and freezing points of pure water

Question 9 Status: Partial credit Points earned: 0.50/1.00 What can an understanding of concentration help you do? Select one or more: Analyze the molecular structure of pure crystalline solid Control the amount of sanitizing chemicals in pool Provide the correct amount of medication in liquid medicine Predict the boiling and freezing points of pure water



Answers

Predict the approximate freezing points of $0.10 \mathrm{m}$ solutions of the following solutes dissolved in water: (a) $\mathrm{CO}\left(\mathrm{NH}_{2}\right)_{2}(\text { urea }) ;$ (b) $\mathrm{NH}_{4} \mathrm{NO}_{3} ;$ (c) $\mathrm{HCl} ;$ (d) $\mathrm{CaCl}_{2}$ (e) $\operatorname{MgSO}_{4} ;$ (f) $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$ (ethanol); $(\mathrm{g}) \mathrm{CH}_{3} \mathrm{COOH}$( acetic acid).

Let's predict the approximate freezing points of 0.1 Moeller Solutions of the following solids dissolved in water For a we have saw Ute Yuria dissolved in water delta T f. It's equal to high K m and you re as a non electrolytes. What's Van Toft factor is one constant for water. 26 to be Celsius promotable. The Mulally for other solutions is 0.1, So people 2.186 degrees Celsius and the process mint freezing point depression here would be minus 0.16 degrees Celsius for be. We have ammonium matri's, which is a very good electrolytes, and in water it will produce two I in. So it's Vantaa factor is too equal to 0.372 degrees Celsius freezing point with zero minus 00.372 degree Celsius and its freezing point depression to be 0.0.372 degrees Celsius or C. We have each CEO and HCL is a strong acid, complete dissociation water spent whole factor is too two lions. Pretty soon, water freezing point depression you minus 0.3 73 Celsius would be its approximate freezing point for D calcium chloride again, Very good electrolyte in water produced three irons. When calcium to chloride this would be equal to 0.558 degrees Celsius. Precent point here, minus 0.558 Priests Celsius for E. We have to make museums, so feeds dignity. So Feet will associate in water and produced 19 of magnesium Wainaina sulfate. So it's Vantaa. Factors too should be quits you 0.372 degrees Celsius TF. Zero minus 00.372 degree Celsius sorts Approximate reason point B minus 0.0.372 degrees Celsius. Um, for e for f ethanol C to 85 0 each epilogue as a non electrolytes and therefore it's mental factor would be one. So we're going to put 186 degrees Celsius. Breezy point would be zero minus 186 degrees Celsius for minds 186 degrees Celsius and Fergie Acetic acid Delta two year. So there's a partial dissociation. Um, we're gonna ask for the approximate freezing point. So a very small amount associate. So, um, the venta factor will take his one 1.86 to view Celsius promotable. Put one's your mole. This is 186 degrees Celsius since approximate freezing 1860.0 minus 0.186 degrees Celsius, which would yield minus 0.1 63 Celsius for acetic acid.

Mhm. Now we don't question 11 Question 11 Say, for the product off the reaction you selected in study Question nine Predict the following in physical properties colors that off matter sell ability in water. And now we have to look at the question. I question I say, See that one off the alkaline metal and write a balance chemical question for its reaction with chlorine. Alright. And now we can do for us to potassium. Possible question. I've potassium react with chlorine, Remember? Chlorine e di atomic molecule Chlorine, nitrogen, oxygen, bromine and out in all of them have toe item. Anyone come about? So you react with chlorine, You get potassium chlorine. All right. Sorry. Yeah. Okay. And this compound is the salt off. Al Khali meto and halogen. So it's gotta stay here. Solace. Okay, so this is gas this solid here on now, the question asked. Predict the following physical property, color, color. So we have color here. A white mhm. They look like Leah. I sometimes clear Leah wide. Okay. And now stick is physical. Set a solid, the biggest with history, mhm color. And now all also all of them. Every song off the alkali metal is a local salute. Scalability in water. So what is available? So you say? Yeah, You could stand here all off. Happily Metro, do you think this is what you need to take care of people? What soluble get? Yeah, this is

Now we do problem. 12 Problem. Toss A for the product. Off the reaction. Usual attic in question 10. Predict the following Physical properties color. Step off matter. Sell ability in water. And now question 10. Say select what off the alcohol. The earth metal and right abandons chemical equation for extraction with oxygen. Okay, And now I can rise body. Um All right, bottom react. Quiz. Oh, sorry. Valium first. Yeah. Volume react with oxygen produce. Bye from oxide. Right. So this is solid. This is yes. He solid here too. And now what they say? They say the color color is white. This is white. Yeah. Both Assam looked likelier, but this completely white and this set a matter. Okay. Mhm. This so that so. Lividity. Yeah. What a solo for all of them. You have to remember which ones available we want answered into Lobo. So we finished the gun, wouldn't you

Mhm. When we calculate the freezing point depression, you use the formula that the change in freezing point is equal to the freezing point. Constant comes to morality times the degree of ionization. So if we're dealing with solutions of water, the freezing point constant is 1.86 degrees Celsius per mobile. Um, which means if we have a solution, that is 0.1 Molo, uh, Yuria. Then you're going to plug in, Let's do it and read the freezing point Constant, which is in black and then in radio plug in the concentration. Let me put the units. This is degrees Celsius per melo, not small. And then we have times the degree of organization. Which area is a non electrolyte? It won't split into ions, so the degree of organization is one. So basically you're multiplying 1.86 times 0.1 Okay, which will give you 0.186 degrees Celsius. That's the freezing point. Depression. Now, water freezes at zero degrees Celsius. So you just have to subtract, right? Mhm. Yeah. And you will get negative 0.186 degrees Celsius as your new freezing point. Mhm. If you have ammonium nitrate, which is N h four n 03 Then it will split into NH four plus an N 03 minus. So I is going to be, too. It forms two ions. Let me put here that this was your idea. So you use the same constant because you have the same solvent. We're still using the same morality. Except we're multiplying by two. Yeah. Oh. So what's going to give us about 0.38? We can get the exact number on our calculator. 0.186 to 0.372 Okay. Yeah. And when we subtract it from zero, we're gonna get negative. 0.372 degrees Celsius is going to be the freezing point. Just Yeah. Mm. Next, we have hcl So for H c l. I equals two because it forms h plus and cl minus. So it's going to be the exact same numbers as in part B. Which means that the freezing point will be the same. 0.372 degrees Celsius. Right? I'll erase part A to make room. Mhm here for Sandy? Yeah. I mean, for d e N f Okay, so let's do part D. Your commission. Mm. See, a C l two. Okay, so that's gonna be one calcium. And to chlorine. I equals three. Yeah. So our delta T f is 1.86 times 0.10 Molo, times three. Yeah. Okay. And that comes out to 0.558 So when you subtract that from zero, you get that. The new freezing point is negative. 0.5 58 degrees Celsius. Yeah. Okay. Mhm. No, I'll erase this on the bottom just to make more room. No. Mhm. Yeah. Mm. Yeah. Mhm. Yes. M g s 04 Thank you. I is equal to chew. So it's the same thing as, um, Parts B and C. And your answer is going to be sure. Yeah. Negative. 0.372 degrees Celsius. Mhm for part F, we have C two. Yeah, h 50 h, which is ethanol. And that doesn't lionize. So I equals one, just like for your area, in part a. Okay, right. And then that would make our answer the same as in part a negative. 0.18 six degrees Celsius. Okay. And Lastly, we have acetic acid. Okay. Same thing. Yeah. Mhm. Yeah, as in mhm parts, Uh, B c N e acetic acid lionizes into h plus an acetate. So I equals two. And that would make our answer negative 0.372 degrees Celsius, which shows that collaborative properties like freezing point depression depends only on the amount of solid present. And that's why all the numbers are the same for the same degree of ionization, regardless of the type of solid.


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