Membranes: Cell Membrane and Purple Dark Essay Example
Cell Membranes and Transport
Hands-On Labs, Inc. Version 42-0033-00-01
Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.
Exercise 1: Diffusion
Observations
Data Table 1: Rate of diffusion in different temperatures | | ºC | Minutes | Temperature | InitialTemp. | InitialColor | 5 | 10 | 15 | 20 | 25 | 30 | 60 | Cold | 3 | white | white | white | white | white | white | white | Mostly white some blue | Ambient | 25 | white | blueish | Light blue purple | blue purple | blue purple | purple | purple | Dark purple | Hot | 96 | white | purple | DARKpurpleple | Dark purple | Dark purple | Dark purple | Dark purple | Dark purple |
Questions
A. Write a one-paragraph analysis of the results for the procedure. Provide reasons for the difference in the rate of diffusion at the different temperatures.
The results of this lab were greatly influenced by the temperature of the KI solution. The bag placed in the heated solution began to change color (from white to light purple) almost immediately and changed to dark purple within 7minutes. The second bag in room temp. solution took about 5 minutes to see a slight change in color (from white to light blue) and about 20 to turn dark purple. The third bag in the cold temp. solution barely changed color at all at the end of the hour (bluish tint.) According to the text (p.68), “ Because the driving force for diffusion is the kinetic energy of the
Hands-On Labs, Inc. Version 42-0033-00-01
Lab Report Assistant This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is simply a summary of the experiment’s questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The intent is to facilitate students’ writing of lab reports by providing this information in an editable file which can be sent to an instructor.
Exercise 1: Diffusion
Observations
Data Table 1: Rate of diffusion in different temperatures | | ºC | Minutes | Temperature | InitialTemp. | InitialColor | 5 | 10 | 15 | 20 | 25 | 30 | 60 | Cold | 3 | white | white | white | white | white | white | white | Mostly white some blue | Ambient | 25 | white | blueish | Light blue purple | blue purple | blue purple | purple | purple | Dark purple | Hot | 96 | white | purple | DARKpurpleple | Dark purple | Dark purple | Dark purple | Dark purple | Dark purple |
Questions
A. Write a one-paragraph analysis of the results for the procedure. Provide reasons for the difference in the rate of diffusion at the different temperatures.
The results of this lab were greatly influenced by the temperature of the KI solution. The bag placed in the heated solution began to change color (from white to light purple) almost immediately and changed to dark purple within 7minutes. The second bag in room temp. solution took about 5 minutes to see a slight change in color (from white to light blue) and about 20 to turn dark purple. The third bag in the cold temp. solution barely changed color at all at the end of the hour (bluish tint.) According to the text (p.68), “ Because the driving force for diffusion is the kinetic energy of the