A student didn't heat enough the original NasCO3 + NaHCO3 sample mixture until constant weight. The...
A student didn't heat enough the original NasCO3 + NaHCO3 sample mixture until constant weight. The % weight of NaHCO3 in the original sample after his calculations should:
|
Be higher than the original |
|
Be lower than the original |
|
Be the same as the original |
|
Remain unchanged |
Homework Answers
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A student didn't heat enough the original NasCO3 + NaHCO3 sample
mixture until constant weight. The...
3. "Heating to constant mass” means a. To heat the sample and cool it until its...
3. "Heating to constant mass” means a. To heat the sample and cool it until its mass is stable on the balance b. To heat the sample and cool it, take its mass, heat it and cool it and retake the mass and averaging the two masses c. To heat the sample, cool it down, take its mass, then again heat it and cool it, retake the mass, and repeat this cycle until the mass in two consecutive weighing is...
Question 2,3,4 please. ESTIONS: 1. Many students do not recover 100% of the original mixture. Describe...
Question 2,3,4 please.
ESTIONS: 1. Many students do not recover 100% of the original mixture. Describe at least two possible problems that could cause less than 100% recovery of the mixture. 2. A student received a mixture that actually contained 50.0% salt and 50.0% sand. At the end of the experiment, this student calculated that his sample was composed of 45.2% salt and 54.8% sand. What might he have done (or not done correctly) during the experiment to cause this...
* A student cools a sample in a capillary tube after melting it. Upon attempting to determine the melting point on...
* A student cools a sample in a capillary tube after melting it. Upon attempting to determine the melting point on the same sample, the stjudent does not obtain the same melting point. Why? . A student places his TLC plate in a chamber where the solvent level is higher than the starting line on the TLC. How does that affect the experiment? . A student leaves off the top of her TLC chamber. How will that affect her Rf...
Sample 2 97.79 g 102.95 g 101.15 g Sample 1 (a) Mass of 98.32 g crucible...
Sample 2 97.79 g 102.95 g 101.15 g Sample 1 (a) Mass of 98.32 g crucible + lid (b) Mass of crucible, lid + 103.76 g KCIO3 (c) Mass of crucible, lid + 102.01g residue after 1st heating (d) Mass of crucible, lid + residue after 101.69 g 2nd heating (e) Mass of crucible, lid + 101.68 g residue after 3rd heating 101.05 g 101.01 g Data Analysis .Use your data to determine the experimental mass percent of oxygen in...
For the following processes, calculate the indicated quanti- ties for a system consisting of 1 mol...
For the following processes, calculate the indicated quanti- ties for a system consisting of 1 mol of N2 gas. Assume ideal gas behavior. a. The gas, initially at 10 bar, is expanded tenfold in volume against a constant external pressure of 1 bar, all at 298 K. Calculate q, w, ?U and ?H for the gas. b. After the expansion in part (a), the volume is fixed, and heat is added until the temperature reaches 373 K. Calculate q, w,...
c. How many moles of oxygen gas were produced? Round your answer to 4 sig figs....
c. How many moles of oxygen gas were produced? Round your answer to 4 sig figs. Question le Answer d. Calculate the experimental value for the gas constant R with units of L'atm/mol K. Round your answer to 4 sig figs. . 23L PV = nRT Question 1d Answer olzan o (2 mol 10.08. 2016 (29ct 2. While decomposing a KCIO, mixture, the experiment apparatus used to collect the oxygen gas sprang a leak. Would this error cause the following...
Can I get help with 3 please, but may you please check my responses for 1...
Can I get help with 3 please, but may you please check my responses
for 1 & 2.
Problems 1. Oxalic acid dihydrate, HyC204 2H20, is often used as a primary standard for the standardization of base solutions. For a procedure comparable to this experiment, approximately how many grams of oxalic acid dihydrate should be used in order to have a volume of about 15 ml of NaOH solution (approximately 0.15M) for the titration? The acid is diprotic (two H...
Item 1 In the case below, the original source material is given along with a sample of student work. Determine the type of plagiarism by clicking the appropriate radio button. Original Source Material...
Item 1 In the case below, the original source material is given along with a sample of student work. Determine the type of plagiarism by clicking the appropriate radio button. Original Source Material Student Version But what are reasonable outcomes of the influence of global processes on education? While the question of how global processes influence all aspects of education (and who controls these forces) is multidimensional and not completely testable, there appear to be some theories of globalization as it...
Item 1 In the case below, the original source material is given along with a sample...
Item 1 In the case below, the original source material is given along with a sample of student work. Determine the type of plagiarism by clicking the appropriate radio button. Original Source Material Student Version While solitary negative reactions or unjustified suggestions for change have the potential to dissipate discourse rather than build it, the pattern analysis shows that the anonymous condition seemed to provide a safe explorative space for learners to try out more reasons for their multiple solutions....
yrk 8 Assume that it is now January 1, 2020. Wayne-Martin Electric Inc. (WME) has developed...
yrk 8 Assume that it is now January 1, 2020. Wayne-Martin Electric Inc. (WME) has developed a solar panel capable of generating 200% more electricity than any other solar panel currently on the market. As a result, WME is expected to experience a 14% annual growth rate for the next 5 years. Other firms will have developed comparable technology by the end of 5 years, and WME's growth rate will slow to 5% per year indefinitely. Stockholders require a return...
3. "Heating to constant mass” means a. To heat the sample and cool it until its mass is stable on the balance b. To heat the sample and cool it, take its mass, heat it and cool it and retake the mass and averaging the two masses c. To heat the sample, cool it down, take its mass, then again heat it and cool it, retake the mass, and repeat this cycle until the mass in two consecutive weighing is...
Question 2,3,4 please.
ESTIONS: 1. Many students do not recover 100% of the original mixture. Describe at least two possible problems that could cause less than 100% recovery of the mixture. 2. A student received a mixture that actually contained 50.0% salt and 50.0% sand. At the end of the experiment, this student calculated that his sample was composed of 45.2% salt and 54.8% sand. What might he have done (or not done correctly) during the experiment to cause this...
* A student cools a sample in a capillary tube after melting it. Upon attempting to determine the melting point on the same sample, the stjudent does not obtain the same melting point. Why? . A student places his TLC plate in a chamber where the solvent level is higher than the starting line on the TLC. How does that affect the experiment? . A student leaves off the top of her TLC chamber. How will that affect her Rf...
Sample 2 97.79 g 102.95 g 101.15 g Sample 1 (a) Mass of 98.32 g crucible + lid (b) Mass of crucible, lid + 103.76 g KCIO3 (c) Mass of crucible, lid + 102.01g residue after 1st heating (d) Mass of crucible, lid + residue after 101.69 g 2nd heating (e) Mass of crucible, lid + 101.68 g residue after 3rd heating 101.05 g 101.01 g Data Analysis .Use your data to determine the experimental mass percent of oxygen in...
c. How many moles of oxygen gas were produced? Round your answer to 4 sig figs. Question le Answer d. Calculate the experimental value for the gas constant R with units of L'atm/mol K. Round your answer to 4 sig figs. . 23L PV = nRT Question 1d Answer olzan o (2 mol 10.08. 2016 (29ct 2. While decomposing a KCIO, mixture, the experiment apparatus used to collect the oxygen gas sprang a leak. Would this error cause the following...
Can I get help with 3 please, but may you please check my responses
for 1 & 2.
Problems 1. Oxalic acid dihydrate, HyC204 2H20, is often used as a primary standard for the standardization of base solutions. For a procedure comparable to this experiment, approximately how many grams of oxalic acid dihydrate should be used in order to have a volume of about 15 ml of NaOH solution (approximately 0.15M) for the titration? The acid is diprotic (two H...
yrk 8 Assume that it is now January 1, 2020. Wayne-Martin Electric Inc. (WME) has developed a solar panel capable of generating 200% more electricity than any other solar panel currently on the market. As a result, WME is expected to experience a 14% annual growth rate for the next 5 years. Other firms will have developed comparable technology by the end of 5 years, and WME's growth rate will slow to 5% per year indefinitely. Stockholders require a return...
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