Homework Answers
7)
Water from beaker (outside the dialysis bag) will enter inside the dialysis bag and thus weight of the dialysis bag will increase.
It is because the concentration of water outside the dialysis bag is higher than inside the dialysis bag. Moreover, dialysis bag is permeable to water and impermeable to NaCl. As a result of the concentration gradient across the membrane of dialysis bag, water enters inside the dialysis bag by the process of osmosis and thus increasing the weight of the dialysis bag.
Add Answer to:
7) (2 points) if we place one dialysis bag (permeable to water but not permeable to...
CRITICAL THINKING QUESTIONS 1. A pre-weighed dialysis bag which contained a solution of 10% glucose was...
CRITICAL THINKING QUESTIONS 1. A pre-weighed dialysis bag which contained a solution of 10% glucose was placed in a beaker containing a solution of 20% glucose. After one hour, the bag was weighed again a. Calculate the % mass change of this dialysis bag from the following information: • Mass of bag before experiment: 15.39 • Mass of bag after experiment: 12.79 b. Determine the tonicity of the beaker when it is compared to the dialysis bag: 2. facell had...
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...
Question 3: (a) (6 points) We place 120.0 g of a metal at 80.00oC in 436.3...
Question 3:
(a) (6 points) We place 120.0 g of a metal at 80.00oC in
436.3 g of water at 25.00oC. The water is in a beaker
that is also at 25.00oC. The specific heat of water is
4.184 J K-1 g-1 and the heat capacity of the
beaker is 0.6666 kJ K-1. The specific heat capacity of
the metal is 0.4444 J K-1 mol-1. What is the
final temperature of the metal, the water, and the beaker?
(b) (3...
POST-LAB QUESTIONS / HOMEWORK 1. A student performed the following osmosis experiment, similar to the one...
POST-LAB QUESTIONS / HOMEWORK 1. A student performed the following osmosis experiment, similar to the one you did, using a different combination of substances. Determine his/her results and explain them by answering the questions in the table by filling in the blank boxes. Assume that the dialysis bag is impermeable to sucrose. Set-up 1 Set-up 2 Set-up 3 Set-up 4 Set-up 5 Bags 15 mL in each Tap water Tap water 55% sucrose 21% sucrose solution solution Tap water Beakers...
End of exercise. Questions Name 1. In a perfectly tied and unbroken bag should we seeulence...
End of exercise. Questions Name 1. In a perfectly tied and unbroken bag should we seeulence of sugar molecules passing throush the membrane"? Quallly your answer in terms of sectiva permeability operates. 2. From your graph of the Influence of temperature on the rate of osmosis, what can you conclude about the effects of temperature on the rate of osmosis Hint: How are temperature and molecular motion related? 3. Was dynamic equilibrium reached in any of the syrup demonstrations? Explain...
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like...
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like methanol and acetone that are volatile (have low boiling points), but even solid organic materials can produce vapors that may be toxic. Furthermore, organic materials are flammable, and solvent vapors in the air can and do produce explosive mixtures. You should take some general precautions when doing organic chemistry: Do not get solutions on your skin. You do not need to always wear gloves...
O-7 points BowskyintroStatt 8PR.018. My Notes Ask Your Teacher A sample of 20 heads of lettuce...
O-7 points BowskyintroStatt 8PR.018. My Notes Ask Your Teacher A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was 2.2 pounds with a standard deviation of 0.1 pounds. The population standard deviation is known to be 0.2 pounds. Construct a 95 % confidence interval for the population mean welght of the heads of lettuce. State the confidence...
I really just need all the equations, please and thank you. MATERIALS: cene nitric acid, HNO,...
I really just need all the equations, please and thank you.
MATERIALS: cene nitric acid, HNO, 3.0M sodium hydroxide, NaOH 6.0 M sulfuric acid, H2SO4 zine metal DI water PROCEDURE: Make sure you record detailed observations after almost every step. You will also need to write the balanced chemical equations for almost every step. Make sure you answer any questions associated with a step 1. Weigh approximately 0.5 g of copper metal and record the weight. Place the copper in...
just making sure did I do right in number 10. and im confused at number 11...
just making sure did I do right in number 10. and im confused at
number 11 and 12 13. becausse we didnt learn in class. please help.
thanks for your patient
PROCEDURE 1. This experiment is to be conducted individually. on the side shelf: small squares of copper, NaOH, HSO in the hood: conc. HNOs, conc. HC 2. The following items will be found 4 Use your brush and some soap solution to wash your casserole dish as well as...
Below is a lab hand out for the questions. All my data for the questions are...
Below is a lab hand out for the questions. All my data for the questions are filled out below in BOLD LETTERING. All the questions I need answered are at the bottom with boxes where to put the answers. Background Alka-Seltzer� is an over-the-counter antacid and pain relief drug. The tablet contains aspirin (acetylsalicylic acid), citric acid, and sodium bicarbonate (NaHCO3). Sodium bicarbonate (NaHCO3) is responsible for the effervescent action of Alka-Seltzer. In this lab we will investigate the reaction...
CRITICAL THINKING QUESTIONS 1. A pre-weighed dialysis bag which contained a solution of 10% glucose was placed in a beaker containing a solution of 20% glucose. After one hour, the bag was weighed again a. Calculate the % mass change of this dialysis bag from the following information: • Mass of bag before experiment: 15.39 • Mass of bag after experiment: 12.79 b. Determine the tonicity of the beaker when it is compared to the dialysis bag: 2. facell had...
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...
Question 3:
(a) (6 points) We place 120.0 g of a metal at 80.00oC in
436.3 g of water at 25.00oC. The water is in a beaker
that is also at 25.00oC. The specific heat of water is
4.184 J K-1 g-1 and the heat capacity of the
beaker is 0.6666 kJ K-1. The specific heat capacity of
the metal is 0.4444 J K-1 mol-1. What is the
final temperature of the metal, the water, and the beaker?
(b) (3...
POST-LAB QUESTIONS / HOMEWORK 1. A student performed the following osmosis experiment, similar to the one you did, using a different combination of substances. Determine his/her results and explain them by answering the questions in the table by filling in the blank boxes. Assume that the dialysis bag is impermeable to sucrose. Set-up 1 Set-up 2 Set-up 3 Set-up 4 Set-up 5 Bags 15 mL in each Tap water Tap water 55% sucrose 21% sucrose solution solution Tap water Beakers...
End of exercise. Questions Name 1. In a perfectly tied and unbroken bag should we seeulence of sugar molecules passing throush the membrane"? Quallly your answer in terms of sectiva permeability operates. 2. From your graph of the Influence of temperature on the rate of osmosis, what can you conclude about the effects of temperature on the rate of osmosis Hint: How are temperature and molecular motion related? 3. Was dynamic equilibrium reached in any of the syrup demonstrations? Explain...
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like methanol and acetone that are volatile (have low boiling points), but even solid organic materials can produce vapors that may be toxic. Furthermore, organic materials are flammable, and solvent vapors in the air can and do produce explosive mixtures. You should take some general precautions when doing organic chemistry: Do not get solutions on your skin. You do not need to always wear gloves...
O-7 points BowskyintroStatt 8PR.018. My Notes Ask Your Teacher A sample of 20 heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was 2.2 pounds with a standard deviation of 0.1 pounds. The population standard deviation is known to be 0.2 pounds. Construct a 95 % confidence interval for the population mean welght of the heads of lettuce. State the confidence...
I really just need all the equations, please and thank you.
MATERIALS: cene nitric acid, HNO, 3.0M sodium hydroxide, NaOH 6.0 M sulfuric acid, H2SO4 zine metal DI water PROCEDURE: Make sure you record detailed observations after almost every step. You will also need to write the balanced chemical equations for almost every step. Make sure you answer any questions associated with a step 1. Weigh approximately 0.5 g of copper metal and record the weight. Place the copper in...
just making sure did I do right in number 10. and im confused at
number 11 and 12 13. becausse we didnt learn in class. please help.
thanks for your patient
PROCEDURE 1. This experiment is to be conducted individually. on the side shelf: small squares of copper, NaOH, HSO in the hood: conc. HNOs, conc. HC 2. The following items will be found 4 Use your brush and some soap solution to wash your casserole dish as well as...
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