Homework Answers
Ans-3) The main purpose of rinsing the dialysis bag before placing them in their respective beakers is to rinse off the extra glucose or starch present in the bag so that at the beginning of the experiment itself,the water in the bag remains as distilled water.
Ans-4) The colour of the indicator phenolphthalein changes into pink in the solution with NaOH when the bag contains phenolphthalein because phenolphthalein is an indicator of pH that turns red or pink in basic solutions.
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3. Why is it necessary to rinse the bags before you place them in their respective...
Why is it necessary to rinse the pipets with the solution to be used in them...
Why is it necessary to rinse the pipets with the solution to be used in them before using the pipets? Why is it necessary to rinse out the cuvette with the solution to be used in it before making our measurements? Why must we use the same cuvette for ail measurements? What is the purpose of "zeroing" the spectrophotometer using a "blank" solution (water)? What assumptions are we making in the calculations and analysis for this lab? 6.019 g of...
QUESTIONS Submit your answers on a separate sheer as necessary.) 1. What is the purpose of...
QUESTIONS Submit your answers on a separate sheer as necessary.) 1. What is the purpose of the indicator? How does it se of the indicator? How does it tell you when the titration is com Give two reasons for the statement below: (Hint: Consider both your own experiment and that of the person who uses the balance after you) Always dry the outside surfaces of beakers, flasks, and other pieces of glassware before you place them on the balance pan....
Why it would be necessary to chemically preserve cells before sectioning them?
Why it would be necessary to chemically preserve cells before sectioning them?
2. Rinse out your jars and fill them 3/4-full with clean water. Sprinkle a small amount...
2. Rinse out your jars and fill them 3/4-full with clean water. Sprinkle a small amount of salt into one jar and a small amount of wheat flour (any powdered substance like powdered milk or hot cocoa ect. into the other jar. Place the lids on and shake. a. What difference(s) do you see? b. Why, do you suppose? (Try to come up with a couple of hypotheses) 1. Fill two jars each half-way with water. Add a small amount...
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...
3. The concentration of sodium hydroxide in this experiment is approximately 2%. Why isn't it necessary...
3. The concentration of sodium hydroxide in this experiment is approximately 2%. Why isn't it necessary to know the precise concentration of the base? Effect of Solvent on the SNI Solvolysis of tert-butyl chloride 1. Students will work in pairs. You will prepare mixtures of ethanol and water as well as another solvent (assigned by your lab instructor) and water. The composition of each mixture is given in Table 1. 2. Label four test tubes. To each test tube add...
1. (2 pts) What is produced when polysaccharides and disaccharides are hydrolyzed? 2. (2 pts) A...
1. (2 pts) What is produced when polysaccharides and disaccharides are hydrolyzed? 2. (2 pts) A monosaccharides can exist as an open chain or as a cyclic compound. Which form is more stable? 3. (4 pts) Sucrose is the only carbohydrate for which it is necessary to make a fresh solution (all of the other carbohydrates will already be prepared in solution for you). When performing the Benedict's test and the others), why is it necessary for YOU to make...
1. If you were to place an unsalted cracker on your tongue and left it there...
1. If you were to place an unsalted cracker on your tongue and left it there (no chewing), it would soon begin to taste sweet. Crackers have starch in them. What enzyme is likely present in your saliva, and what is the starch likely being broken down into. 2. Based on what you've learned about enzymes throughout the semester, please answer the following: A similar version of the enzyme from the previous question is also secreted in the small intestine....
Experiment 2: Diffusion Concentration Gradients and Membrane Permeability Data Tables Table 2: Indicator Reagent Data Indicator...
Experiment 2: Diffusion Concentration Gradients and Membrane
Permeability
Data Tables
Table 2: Indicator Reagent Data
Indicator
Starch Positive
Starch Negative
Glucose Positive
Glucose Negative
Glucose Test Strip
n/a
n/a
green
yellow
IKI Solution
dark blue
light brown
n/a
n/a
Table 3: Diffusion of Starch and Glucose Over
Time
Indicator
Dialysis Bag After 60 Minutes
Beaker Water After 60 Minutes
Glucose Test Strip
yellow
green ( if all glucose passed to the beaker from the bag)
IKI
from incolore changed to...
hey, can anybody help me with this. please answer all of the questions. Thank you so...
hey, can anybody help me with this. please answer all of the
questions. Thank you so much.
- Lab Report Form - Question (1 point): 30 total points possible Hypothesis (2 points): Variables Why did you choose this as the variable? (1 point) (2 points) Dependent Variable (2 points) (1 point) Independent Variable (1 point each for a total of 3 points) (1 point) Controlled Variables - a mi Control Group: (2 points) Experimental Group: (2 points) Conclusion: (1 point)...
Why is it necessary to rinse the pipets with the solution to be used in them before using the pipets? Why is it necessary to rinse out the cuvette with the solution to be used in it before making our measurements? Why must we use the same cuvette for ail measurements? What is the purpose of "zeroing" the spectrophotometer using a "blank" solution (water)? What assumptions are we making in the calculations and analysis for this lab? 6.019 g of...
QUESTIONS Submit your answers on a separate sheer as necessary.) 1. What is the purpose of the indicator? How does it se of the indicator? How does it tell you when the titration is com Give two reasons for the statement below: (Hint: Consider both your own experiment and that of the person who uses the balance after you) Always dry the outside surfaces of beakers, flasks, and other pieces of glassware before you place them on the balance pan....
2. Rinse out your jars and fill them 3/4-full with clean water. Sprinkle a small amount of salt into one jar and a small amount of wheat flour (any powdered substance like powdered milk or hot cocoa ect. into the other jar. Place the lids on and shake. a. What difference(s) do you see? b. Why, do you suppose? (Try to come up with a couple of hypotheses) 1. Fill two jars each half-way with water. Add a small amount...
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...
3. The concentration of sodium hydroxide in this experiment is approximately 2%. Why isn't it necessary to know the precise concentration of the base? Effect of Solvent on the SNI Solvolysis of tert-butyl chloride 1. Students will work in pairs. You will prepare mixtures of ethanol and water as well as another solvent (assigned by your lab instructor) and water. The composition of each mixture is given in Table 1. 2. Label four test tubes. To each test tube add...
1. (2 pts) What is produced when polysaccharides and disaccharides are hydrolyzed? 2. (2 pts) A monosaccharides can exist as an open chain or as a cyclic compound. Which form is more stable? 3. (4 pts) Sucrose is the only carbohydrate for which it is necessary to make a fresh solution (all of the other carbohydrates will already be prepared in solution for you). When performing the Benedict's test and the others), why is it necessary for YOU to make...
1. If you were to place an unsalted cracker on your tongue and left it there (no chewing), it would soon begin to taste sweet. Crackers have starch in them. What enzyme is likely present in your saliva, and what is the starch likely being broken down into. 2. Based on what you've learned about enzymes throughout the semester, please answer the following: A similar version of the enzyme from the previous question is also secreted in the small intestine....
Experiment 2: Diffusion Concentration Gradients and Membrane
Permeability
Data Tables
Table 2: Indicator Reagent Data
Indicator
Starch Positive
Starch Negative
Glucose Positive
Glucose Negative
Glucose Test Strip
n/a
n/a
green
yellow
IKI Solution
dark blue
light brown
n/a
n/a
Table 3: Diffusion of Starch and Glucose Over
Time
Indicator
Dialysis Bag After 60 Minutes
Beaker Water After 60 Minutes
Glucose Test Strip
yellow
green ( if all glucose passed to the beaker from the bag)
IKI
from incolore changed to...
hey, can anybody help me with this. please answer all of the
questions. Thank you so much.
- Lab Report Form - Question (1 point): 30 total points possible Hypothesis (2 points): Variables Why did you choose this as the variable? (1 point) (2 points) Dependent Variable (2 points) (1 point) Independent Variable (1 point each for a total of 3 points) (1 point) Controlled Variables - a mi Control Group: (2 points) Experimental Group: (2 points) Conclusion: (1 point)...
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