Homework Answers
If medicine dropper is used instead of toothpick to spot the standard 4 -cation solutions on the chromatographic paper. The resulting original spots were each 1.0 cm in diameter.
The spot size should not be larger than 1 mm in diameter.
The effect on the results due to this spot diameter leads to poor separation. This is due to the over large spot that cause overlapping of other component spots with similar retention factor (Rf) values.
If this happens then the components cannot be resolved.
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3. A student used a medicine dropper, instead of a toothpick, to spot the standard 4-cation solutions on the chromat...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography?...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
1-4 1. What would happen if you used a water-soluble pen on the chromatography paper to...
1-4
1. What would happen if you used a water-soluble pen on the chromatography paper to mark your origin line? How would this affect the Re values? 2. A student accidently adds 17 ml of NaCl to their beaker rather than the 7 mL of NaCl they were suppose to add to their beaker. How might this mistake affect their chromatogram? Do you think they would be able to obtain any data? Briefly explain your answer. 10 3. Is it...
Problem Set 3: Unit Conversions and Density EXTRA CREDIT-up to 4 points A sheet of standard typing paper is 8.5 inc...
Problem Set 3: Unit Conversions and Density EXTRA CREDIT-up to 4 points A sheet of standard typing paper is 8.5 inches by 11 inches. What is the area of a length x width) sheet of paper in cm2? (Area The distance between two carbon atoms in a piece of diamond is 0.154 nm. What 2 is this distance in inches? What is the volume in milliliters of 1.0 pints of cream? 3. The average density of whole milk is 1.034...
some of the reagents used in this lab are easily confused: such as persulfate and thiosulfate....
some of the reagents used in this lab are easily confused: such as
persulfate and thiosulfate. A student inadvertently switched these
reagents, adding the persulfate to beaker A and thiosulfate to
beaker b. How would this affect the results? What would the student
observe with respect to the mixture in beaker A?
3. Some of the reagents used in this lab are easily confused: such as persulfate (S.O,2-) and thiosulfate (S,0,2-). A student inadvertently switched these reagents, adding the persulfate...
what is the prediction of the unknown amino acids mixture based on the strip from thin layer chromatography sheet? The unknown mixtures can be ala plus asp, ala plus asp plus lys, lys plus asp or ala...
what is the prediction of the unknown amino acids mixture
based on the strip from thin layer chromatography sheet?
The unknown mixtures can be ala plus asp, ala plus asp plus
lys, lys plus asp or ala plus lys.
anion exchange resin was used
Tubes 2,3, 6 and 7 had a spot appear that was light pink
We were unable to transcribe this imageWe were unable to transcribe this imageH-) to the column followed by a sufficient amount of the...
Can you help me answer 4&5? Zinc(ll) and the ligand L forma 1:1 complex that absorbs...
Can you help me answer 4&5?
Zinc(ll) and the ligand L forma 1:1 complex that absorbs strongly at 600 am As long as the molar concentration of L exceeds that of Zn(II) by a factor of 5. the absorbance depends only on the cation concentration Neither Zn(ll) nor L absorbs at 600 nm A solution that is 1.59 times 10^-4 M Zn(ll) and 1.00 times 10^-3 M in L has an absorbance of 0,352 in a 1.00-cm cell at 600...
4. Suppose that a student performed the experiment and calculations perfectly as directed except that, unknown...
4. Suppose that a student performed the experiment and calculations perfectly as directed except that, unknown to the student, the balance was not zeroed but weighed 0.100 g too high throughout the experiment. Would the calculated val- ue for the density of the unknown liquid be correct? That is, would it be equal to, higher than, or lower than the true value. Explain your answer in clear and correct English. 16 LABORATORY EXPERIMENTS IN GENERAL CHEMISTRY ed in question 4...
please show the work Prelab for Experiment 5 - Conductivity and Chemical Reactions 2.34E-4. The 'E' must be capitalized." Scientific notation format The prelab questions mirror tho...
please show the work
Prelab for Experiment 5 - Conductivity and Chemical Reactions 2.34E-4. The 'E' must be capitalized." Scientific notation format The prelab questions mirror those that you will be doing at the end of the experiment. Bring your work for this prelab assignment to lab and you will have a much easier time completing the Data Analysis Sheet at the end of the experiment. Student information Enter your name (first and last) and the last 4 digits of...
please help me with this experiment??? Enzymes Experiment 1: Enzymes in Food Amylase is used by...
please help me with this experiment???
Enzymes Experiment 1: Enzymes in Food Amylase is used by humans to facilitate digestion. Specifically, it is an enzyme that breaks down starch molecules into sugar molecules. This is why people sometimes observe a sweet taste after sucking on a starch-containing food for an extended period of time. Amylase is found naturally in human saliva and the pancreas. However, it is also present in some of the common plant foods consumed by humans. This...
5. What was the purpose of the NaNO3 solution in this experiment? 6. Could a solution...
5. What was the purpose of the NaNO3 solution in this experiment? 6. Could a solution of NaCl be used instead of NaNO3? 7. What was the purpose of FeSO4 solution in this experiment? 8. Could a solution of FeCl, be used instead of FeSO4? 9. Could a solution of NaSO4 be used instead of FeSO4? 10. Calculate the standard cell potential for the spontaneous redox reaction between a Pb(s)/Pb(NO3)2(aq) half-cell and a Ag(s)/AgNO3(aq) half-cell. Which metal would be oxidized?...
2. If two different compounds have the same Rr value, how might they be identified using paper chromatography? 3. Why is it important to keep the spots on the paper as small as possible? 4. If the solvent pool at the bottom of the beaker touched the spots on the 1.5cm line, what would happen to the spots? How would you address this error? 5. If you were teaching a student how to do paper chromatography, what three pieces of...
1-4
1. What would happen if you used a water-soluble pen on the chromatography paper to mark your origin line? How would this affect the Re values? 2. A student accidently adds 17 ml of NaCl to their beaker rather than the 7 mL of NaCl they were suppose to add to their beaker. How might this mistake affect their chromatogram? Do you think they would be able to obtain any data? Briefly explain your answer. 10 3. Is it...
Problem Set 3: Unit Conversions and Density EXTRA CREDIT-up to 4 points A sheet of standard typing paper is 8.5 inches by 11 inches. What is the area of a length x width) sheet of paper in cm2? (Area The distance between two carbon atoms in a piece of diamond is 0.154 nm. What 2 is this distance in inches? What is the volume in milliliters of 1.0 pints of cream? 3. The average density of whole milk is 1.034...
some of the reagents used in this lab are easily confused: such as
persulfate and thiosulfate. A student inadvertently switched these
reagents, adding the persulfate to beaker A and thiosulfate to
beaker b. How would this affect the results? What would the student
observe with respect to the mixture in beaker A?
3. Some of the reagents used in this lab are easily confused: such as persulfate (S.O,2-) and thiosulfate (S,0,2-). A student inadvertently switched these reagents, adding the persulfate...
what is the prediction of the unknown amino acids mixture
based on the strip from thin layer chromatography sheet?
The unknown mixtures can be ala plus asp, ala plus asp plus
lys, lys plus asp or ala plus lys.
anion exchange resin was used
Tubes 2,3, 6 and 7 had a spot appear that was light pink
We were unable to transcribe this imageWe were unable to transcribe this imageH-) to the column followed by a sufficient amount of the...
Can you help me answer 4&5?
Zinc(ll) and the ligand L forma 1:1 complex that absorbs strongly at 600 am As long as the molar concentration of L exceeds that of Zn(II) by a factor of 5. the absorbance depends only on the cation concentration Neither Zn(ll) nor L absorbs at 600 nm A solution that is 1.59 times 10^-4 M Zn(ll) and 1.00 times 10^-3 M in L has an absorbance of 0,352 in a 1.00-cm cell at 600...
4. Suppose that a student performed the experiment and calculations perfectly as directed except that, unknown to the student, the balance was not zeroed but weighed 0.100 g too high throughout the experiment. Would the calculated val- ue for the density of the unknown liquid be correct? That is, would it be equal to, higher than, or lower than the true value. Explain your answer in clear and correct English. 16 LABORATORY EXPERIMENTS IN GENERAL CHEMISTRY ed in question 4...
please show the work
Prelab for Experiment 5 - Conductivity and Chemical Reactions 2.34E-4. The 'E' must be capitalized." Scientific notation format The prelab questions mirror those that you will be doing at the end of the experiment. Bring your work for this prelab assignment to lab and you will have a much easier time completing the Data Analysis Sheet at the end of the experiment. Student information Enter your name (first and last) and the last 4 digits of...
please help me with this experiment???
Enzymes Experiment 1: Enzymes in Food Amylase is used by humans to facilitate digestion. Specifically, it is an enzyme that breaks down starch molecules into sugar molecules. This is why people sometimes observe a sweet taste after sucking on a starch-containing food for an extended period of time. Amylase is found naturally in human saliva and the pancreas. However, it is also present in some of the common plant foods consumed by humans. This...
5. What was the purpose of the NaNO3 solution in this experiment? 6. Could a solution of NaCl be used instead of NaNO3? 7. What was the purpose of FeSO4 solution in this experiment? 8. Could a solution of FeCl, be used instead of FeSO4? 9. Could a solution of NaSO4 be used instead of FeSO4? 10. Calculate the standard cell potential for the spontaneous redox reaction between a Pb(s)/Pb(NO3)2(aq) half-cell and a Ag(s)/AgNO3(aq) half-cell. Which metal would be oxidized?...
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