Lab 1 Diffusion And Osmosis Pre-lab Quiz
Lab 1 diffusion and osmosis pre-lab quiz for coach wimpey and coach johnson.
Questions and Answers
- 1.
What is the purpose of IKI in the lab?
- A.
To indicate the presence of glucose
- B.
To react with the dialysis tubing
- C.
To indicate the presence of starch
- D.
To color the solution red
Correct Answer
C. To indicate the presence of starchExplanation
IKI (iodine-potassium iodide) is commonly used in laboratory experiments to indicate the presence of starch. When IKI comes into contact with starch, it forms a dark blue-black color. This reaction is due to the formation of a complex between iodine and the helical structure of starch molecules. Therefore, the purpose of IKI in the lab is to detect the presence of starch by observing the color change in the solution.Rate this question:
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- 2.
In this lab the dialysis tubing represents
- A.
Mitochondria
- B.
Plasma Membrane
- C.
Chloroplast
- D.
Nucleus
Correct Answer
B. Plasma MembraneExplanation
The dialysis tubing represents the plasma membrane. The plasma membrane is a selectively permeable barrier that surrounds the cell and regulates the movement of substances in and out of the cell. Dialysis tubing is a semi-permeable membrane that allows the passage of small molecules, similar to the plasma membrane. Therefore, using dialysis tubing in the lab can simulate the functions and properties of the plasma membrane.Rate this question:
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- 3.
Which of the following is true of sucrose?
- A.
It is non-polar
- B.
It is table sugar
- C.
It is the same as starch
- D.
It will not dissolve in water
Correct Answer
C. It is the same as starch -
- 4.
Which molecule is larger, glucose or IKI?
- A.
IKI
- B.
Glucose
- C.
Can't tell
Correct Answer
B. GlucoseExplanation
Glucose is larger than IKI. Glucose is a monosaccharide with a molecular formula of C6H12O6, while IKI (iodine potassium iodide) is a compound consisting of iodine and potassium iodide. Glucose has a larger molecular structure with six carbon atoms, while IKI is a smaller compound. Therefore, glucose is the larger molecule compared to IKI.Rate this question:
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- 5.
A 0.2 M solution of sucrose will have
- A.
.2 molecules of sucrose per milliliter of water
- B.
.2 moles of sucrose per milliliter of water
- C.
.2 moles of sucrose per L of water
- D.
.2 moles of sucrose per L of solution
Correct Answer
D. .2 moles of sucrose per L of solutionExplanation
A 0.2 M solution of sucrose means that there are 0.2 moles of sucrose dissolved in 1 liter of solution. The concentration of the sucrose is given in moles per liter of solution, not moles per liter of water. Therefore, the correct answer is ".2 moles of sucrose per L of solution."Rate this question:
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- 6.
Which solution list below is most hypertonic relative to distilled water?
- A.
0.0 M sucrose
- B.
0.2 M sucrose
- C.
0.4 M sucrose
- D.
0.6 M sucrose
Correct Answer
D. 0.6 M sucroseExplanation
The solution that is most hypertonic relative to distilled water is 0.6 M sucrose. Hypertonic solutions have a higher solute concentration compared to the surrounding solution. In this case, the sucrose concentration increases from 0.0 M to 0.6 M, indicating a higher solute concentration. Therefore, 0.6 M sucrose is the most hypertonic solution among the given options.Rate this question:
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- 7.
How is the presence of glucose detected?
- A.
Glucose test strip
- B.
IKI
- C.
Change in mass
- D.
All of the above
Correct Answer
A. Glucose test stripExplanation
The presence of glucose is detected using a glucose test strip. This strip contains a chemical reagent that reacts with glucose in a sample, producing a color change. By comparing the color of the strip with a color chart, the concentration of glucose can be determined. The other options, IKI (iodine-potassium iodide) and change in mass, are not commonly used methods for detecting glucose. Therefore, the correct answer is the glucose test strip.Rate this question:
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- 8.
In the lab how can you tell whether the dialysis bags gained or lost water?
- A.
By the change in color
- B.
By the change in volume
- C.
By the change in mass
- D.
You cannot tell
Correct Answer
C. By the change in massExplanation
In the lab, the most reliable way to determine whether the dialysis bags gained or lost water is by measuring the change in mass. This is because water has a known density, and any change in mass would indicate a corresponding change in the amount of water present in the dialysis bags. Changes in color or volume may not necessarily correlate with changes in water content, making them less accurate indicators.Rate this question:
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- 9.
Osmosis is
- A.
The diffusion of sucrose
- B.
The diffusion of IKI
- C.
The diffusion of glucose
- D.
The diffusion of water
Correct Answer
D. The diffusion of waterExplanation
Osmosis is the process of diffusion of water molecules across a selectively permeable membrane. It occurs when there is a difference in the concentration of solute molecules on either side of the membrane. Water moves from an area of lower solute concentration to an area of higher solute concentration in order to equalize the concentration on both sides. Therefore, the correct answer is "The diffusion of water."Rate this question:
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- 10.
How does water move?
- A.
Always from higher potential to lower potential
- B.
Always from lower potential to higher potential
- C.
Movement varies depending on mass
- D.
Cannot tell until you do the lab
Correct Answer
A. Always from higher potential to lower potentialExplanation
Water moves from higher potential to lower potential due to the principle of diffusion. This means that water molecules will naturally move from an area of higher concentration (higher potential) to an area of lower concentration (lower potential) until equilibrium is reached. This movement occurs through a process called osmosis, where water molecules pass through a semi-permeable membrane to equalize the concentration on both sides. Therefore, water will always move from a region of higher potential to a region of lower potential.Rate this question:
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Mar 22, 2023Quiz Edited by
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Nov 08, 2008Quiz Created by
Born2play4ever
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