If you accidentally spilled a little of unknown t-butanol out of the test tube during an...
If you accidentally spilled a little of unknown t-butanol out of the test tube during an experiment would this cause a lower/higher/no effect on temp change between pure t-butanol and unknown butanol? Why?
Homework Answers
It will cause higher change in temprature between t-butanol and unknown butanol because when some amount of unknown butanol is spilled then yhe mass of unknown butanol will be lower than the mass of unknown butanol expected. And for a fixed quantity of heat is provided then due to less quantity of unknown the tepmrature will be found more than expected which creates a higher change in the temprature between them.
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If you accidentally spilled a little of unknown t-butanol out of
the test tube during an...
1. A student performed a freezing point determination and calculated the molar mass of an unknown...
1. A student performed a freezing point determination and calculated the molar mass of an unknown like you did in this experiment. The only difference in procedure was that when determining the freezing point of the unknown-naphthalene mixture, they started with a clean empty test tube. If the following errors occurred, how would each affect the calculated molar mass of the solute (too high, too low, or no change)? Explain your answers. a. The thermometer used actually read 2.0 celcius...
4. (3 pts) You accidentally add too little hydrazine (H2NNH2, 0.25 mL) to the reaction test...
4. (3 pts) You accidentally add too little hydrazine (H2NNH2, 0.25 mL) to the reaction test tube and the solution is already heating to almost 100 °C. How would you correct this mistake? If left unfixed, what would you expect the effect on the yield to be? 5. (3 pts) You accidentally added half the amount of 3-nitrophthalic acid to the reaction. You have already started filtering the first product. How would you correct this mistake? If left unfixed, what...
A Freezing-Point Depression experiment is done using 2 different test tubes to find the molecular weight...
A Freezing-Point Depression experiment is done using 2 different test tubes to find the molecular weight of an unknown mixture. Tube 1 consists of pure Lauric acid, and Tube 2 consists of Lauric acid + an unknown solute mixture. From the calculations of this experiment, the molecular weight of the unknown acid can be found. A) How would the loss of some Lauric acid from Test Tube 1 have affected the calculation of a molecular weight? Would the calculated molecular...
A student weighs out 1.394 g of t-butyl alcohol into a large test tube and measures...
A student weighs out 1.394 g of t-butyl alcohol into a large test tube and measures the freezing point of the pure solvent to be 21.50 °C. Next the student weighs out 1.068 g of water and adds it to the test tube with the t-butyl alcohol and measures the freezing point of the mixture to be 15.0 °C. What is the freezing point depression constant, Kf, of the t-butyl alcohol?
6. Suppose your TA gives you a test tube containing a phosphate solution of unknown concentration...
6. Suppose your TA gives you a test tube containing a phosphate solution of unknown concentration and asks you to analyze it. Your TA is kind enough to give you a hint: the unknown solution has a phosphate concentration between 4.00 x 105 M and 8.00 x 103M. How would your sample preparation procedure for analyzing this unknown solution differ from the sample preparation procedure for the soda pop?
6. Suppose your TA gives you a test tube containing a...
Freezing Point Depression: Determination of the Molar Mass of an Unknown Substance Laboratory Record Unknown Identifier...
Freezing Point Depression: Determination of the Molar Mass of an Unknown Substance Laboratory Record Unknown Identifier #4 (All unknowns are nonelectrolytes, soi-1) Determination of the freezing point of pure l-butyl alcohol: (Record time-temperature data on the next page) 29.62 1. Mass of empty test tube 2. Mass of test tube and t-butyl alcohol after determination of freezing point of pure t-butyl alcohol 50.25 20.71 3. Mass of t-butyl alcohol Determination of the molar mass of an unknown: (Record time-temperature data...
i cant figure out #8 please help. thank you. also if you could help with #6...
i cant figure out #8 please help. thank you.
also if you could help with #6 it would be greatly
appreciated
CALCULATIONS Show all work. 1. Mass of acetic acid, g 19.66g 2. Mass of unknown sample in acetic acid solution.g 2.00 g 3. Generate a cooling curve by plotting temperature vs time data on a single graph Plot on graphing paper or use a computer program and print plot. See Below 4. Freezing point of pure acetic acid solvent...
subject: calorimetry Post Laboratory Questions 1. A student places 138 g of an unknown metal at...
subject: calorimetry
Post Laboratory Questions 1. A student places 138 g of an unknown metal at 99.9°C into 60.00 g of water at 22.2 °C. The entire system reaches a uniform temperature of 31.5 °C. Calculate the specific heat capacity of the metal. 2. If the correct specific heat of the metal in problem 1 is 0.25 J/gºC, calculate the percent crror. 3. While transferring the piece of unknown metal to the calorimeter, the student dropped the metal into the...
Part C. Benedict's Test. Test Tube Samp Prediction Observations Results (+ or -) 2-hydroxybutanal Benzaldehyde Propanone...
Part C. Benedict's Test. Test Tube Samp Prediction Observations Results (+ or -) 2-hydroxybutanal Benzaldehyde Propanone Cyclohexanone Unknown Part D. Iodoform Test. Test Sample Tube 1 2-hydroxybutanal Prediction Observations Results (+ or -) Benzaldehyde Propanone Cyclohexanone Unknown Experiment 12 Identification of Aldehydes and Ketones O the b e t theader of each holding your breath as a st beward your nose. Record the derson the specified memes from O Ta Test g shes between ones that contain a methyl group...
Charles' Law 1. L 94.0 LOO. mm the length of the original tube 2. Tube diameter...
Charles' Law 1. L 94.0 LOO. mm the length of the original tube 2. Tube diameter = mm radius = dia/2 = mm 3. V V(oil bath) = mm Show calculation for the tube volume here: 4. T (oil bath) °C K -96.5 -75.0 5. L2, L (room temp) mm 6. V2, V(room temp) mm 3 23.80 7. T2, T (room temp) for K 8. T /T2 - for °C ΤΙΤ, τη for K 9. V / V2 = 10....
4. (3 pts) You accidentally add too little hydrazine (H2NNH2, 0.25 mL) to the reaction test tube and the solution is already heating to almost 100 °C. How would you correct this mistake? If left unfixed, what would you expect the effect on the yield to be? 5. (3 pts) You accidentally added half the amount of 3-nitrophthalic acid to the reaction. You have already started filtering the first product. How would you correct this mistake? If left unfixed, what...
6. Suppose your TA gives you a test tube containing a phosphate solution of unknown concentration and asks you to analyze it. Your TA is kind enough to give you a hint: the unknown solution has a phosphate concentration between 4.00 x 105 M and 8.00 x 103M. How would your sample preparation procedure for analyzing this unknown solution differ from the sample preparation procedure for the soda pop?
6. Suppose your TA gives you a test tube containing a...
Freezing Point Depression: Determination of the Molar Mass of an Unknown Substance Laboratory Record Unknown Identifier #4 (All unknowns are nonelectrolytes, soi-1) Determination of the freezing point of pure l-butyl alcohol: (Record time-temperature data on the next page) 29.62 1. Mass of empty test tube 2. Mass of test tube and t-butyl alcohol after determination of freezing point of pure t-butyl alcohol 50.25 20.71 3. Mass of t-butyl alcohol Determination of the molar mass of an unknown: (Record time-temperature data...
i cant figure out #8 please help. thank you.
also if you could help with #6 it would be greatly
appreciated
CALCULATIONS Show all work. 1. Mass of acetic acid, g 19.66g 2. Mass of unknown sample in acetic acid solution.g 2.00 g 3. Generate a cooling curve by plotting temperature vs time data on a single graph Plot on graphing paper or use a computer program and print plot. See Below 4. Freezing point of pure acetic acid solvent...
subject: calorimetry
Post Laboratory Questions 1. A student places 138 g of an unknown metal at 99.9°C into 60.00 g of water at 22.2 °C. The entire system reaches a uniform temperature of 31.5 °C. Calculate the specific heat capacity of the metal. 2. If the correct specific heat of the metal in problem 1 is 0.25 J/gºC, calculate the percent crror. 3. While transferring the piece of unknown metal to the calorimeter, the student dropped the metal into the...
Part C. Benedict's Test. Test Tube Samp Prediction Observations Results (+ or -) 2-hydroxybutanal Benzaldehyde Propanone Cyclohexanone Unknown Part D. Iodoform Test. Test Sample Tube 1 2-hydroxybutanal Prediction Observations Results (+ or -) Benzaldehyde Propanone Cyclohexanone Unknown Experiment 12 Identification of Aldehydes and Ketones O the b e t theader of each holding your breath as a st beward your nose. Record the derson the specified memes from O Ta Test g shes between ones that contain a methyl group...
Charles' Law 1. L 94.0 LOO. mm the length of the original tube 2. Tube diameter = mm radius = dia/2 = mm 3. V V(oil bath) = mm Show calculation for the tube volume here: 4. T (oil bath) °C K -96.5 -75.0 5. L2, L (room temp) mm 6. V2, V(room temp) mm 3 23.80 7. T2, T (room temp) for K 8. T /T2 - for °C ΤΙΤ, τη for K 9. V / V2 = 10....
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