— What is the temperature increase? ☐A 4.9°C B 6.5°C C 8.7°C D from an 2 When 50 cm of hydrochloric acid of concentration 2.0 mol dm³ is added to 50 cm³ of sodium hydroxide solution of concentration 2.0 mol dm3, the temperature increase is 13.0°C NaCl(aq) + H₂O(1) HCl(aq) + NaOH(aq) The experiment is repeated using 25 cm³ of the same hydrochloric acid and 50 cm³ of the same sodium hydroxide solution. 13.0°C 50:50 76 100 ment in its sandard state. (Total for Question 1 = 1 mark) 3,4 25:50 (Total for Question 2=1 mark) Use this space for any rough working. Anything you write in this space will ga CLASSWIZ CASIO

— What is the temperature increase? ☐A 4.9°C B 6.5°C C 8.7°C D from an 2 When 50 cm of hydrochloric acid of concentration 2.0 mol dm³ is added to 50 cm³ of sodium hydroxide solution of concentration 2.0 mol dm3, the temperature increase is 13.0°C NaCl(aq) + H₂O(1) HCl(aq) + NaOH(aq) The experiment is repeated using 25 cm³ of the same hydrochloric acid and 50 cm³ of the same sodium hydroxide solution. 13.0°C 50:50 76 100 ment in its sandard state. (Total for Question 1 = 1 mark) 3,4 25:50 (Total for Question 2=1 mark) Use this space for any rough working. Anything you write in this space will ga CLASSWIZ CASIO

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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State your basis and show calculations. (Kf,water = 1.86 K kg mol-1) NaCl, MgCl2, and CaCO3 are candidate salts in the homemade ice cream-making process. The salts are to be dissolved in the ice-water mixture to lower the temperature of the mixture. The mixture will be then used to freeze ice cream. Which salt will be much more effective in lowering the temperature of the ice-water mixture considering that equal masses of each salt are to be compared?
1) Consider the following substances:Lead (II) Carbonate, PbCO3 KSP = 7.40 x10-14Magnesium Carbonate, MgCO3 KSP = 6.82 x10-6Strontium Carbonate, SrCO3 KSP=5.60 x 10-10If 100.0 grams of each were added to 1.00 L of water at 25°C, put them in increasing order ofconcentration of carbonate ions, CO32-.
A solution is prepared by adding 425g of AgNO3 to 0.150L of water at 40.0∘C. The solubility of AgNO3 at 40.0∘C is 311g100.mL. How many grams of AgNO3 are expected to precipitate if the temperature is dropped to 0.00∘C where the solubility of AgNO3 is only 122g100.mL? Give the answer with three significant figures.
Drug B has a solubility of 2.5 g B 100−1 g−1 water at 80oC and at 4oC the solubility of B is only 0.36 g B 100−1 g−1 of water. If a saturated drug solution at 80oC has 1000 g of drug in it, determine how much water (W) is also present with the drug. The solution is then cooled to 4oC and the drug precipitate is separated from the saturated drug solution. How much of the drug will be precipitated (P) from the initial solution?
At −12.5 ∘C−12.5⁢ ∘C, a common temperature for household freezers, what is the maximum mass of sorbitol (C6H14O6) you can add to 1.00 kg1.00 kg of pure water and still have the solution freeze? Assume that sorbitol is a molecular solid and does not ionize when it dissolves in water. Consult the table of ?fKf values. mass of sorbitol: g
Shown below is a plot of the solubility of benzoic acid in water as a function of temperature. Estimate the Solubility (Constant) Sof benzoic acid at 60°C (include units!) Solubility of Benzoic Acid in Moles/Liter in Water as a Function of Temperature 0.12 Moles per Liter 0.1 0.08 0.06 0.04 0.02 20 0.092 moles/liter If you have trouble viewing this image Click to open: 0.04 moles/liter 0.06 moles/liter 30 1.34 moles/liter 50 40 Degrees Centigrade 60 70
0.376 grams of KHP are placed in an Erlenmeyer flask and some water and a drop of phenolphthalein is added to the flask. The buret is filled with an NaOH (aq) solution of unknown concentration. The NaOH solution is added dropwise to the flask containing KHP (aq). After 12.78 mLs of the NaOH(aq) solution is added, the color of the solution is found to be faintly pink. What is the concentration (M) of the unknown NaOH solution based on this data alone?
Camphor (MW = 104 g/mole) melts at 179.8 °C, and it has a particularly large freezing point depression constant, Kf = 40.0 °C/m. When 0.168 g of an organic substance of unknown molar mass is dissolved in 32.01 g of liquid camphor, the freezing point of the mixture is found to be 176.7 °C. What is the molar mass of the solute?
Cholesterol is an important compound in the body, but in excess has been implicated as a cause of heart disease. A solution of 4.82 g of cholesterol in 112 g of benzene (C6H6) has a freezing point of 4.886°C. The freezing point of pure benzene is 5.455°C; the Kf for benzene is 5.12°C /m. What is the molecular weight of cholesterol?
Using the Kf value for water from your book, you prepare a solution at 25.0 °C from 9.17 molof some solid and 7.31 L of water (d = 0.997 g/mL), but you forgot the identity of the solid. Youknow it was either glucose, sodium acetate, sodium phosphate, or sodium sulfate. You decideto determine the mass indirectly by measuring the freezing point depression of the solution,and find that the solution has a freezing point of −7.02 °C. Which substance is it and how doyou know this?
Arrange the following solutions from lowest to highest freezing point (Tf) 0.65 m ethylene glycol (aq) 0.15 m CaCl2 (aq) 0.40 m MGSO4 (aq) (Ethylene glycol is non-electrolyte. The salts are strong electrolytes.) CaCl2 < Ethylene glycol < MGSO4 A. Ethylene glycol < CaCl2 < MgSO4 В. MGSO4 < Ethylene glycol < CaCl2 OC. CaCl2 < MgSO4 < Ethylene glycol D. Ethylene glycol < MGSO4 < CaCl2 Е.
The freezing point of benzene, C6H6, is 5.500 °C at 1 atmosphere. Kf(benzene) = 5.12 °C/mIn a laboratory experiment, students synthesized a new compound and found that when 11.98 grams of the compound were dissolved in 212.6 grams of benzene, the solution began to freeze at 4.500 °C. The compound was also found to be nonvolatile and a non-electrolyte.What is the molecular weight they determined for this compound? ?g/mol