Alcohols

If you are absent, click here and follow the directions.

This will go in your lab book. Follow the directions to complete the lab.

Purpose: (put into lab book)

• The purpose of this lab is to examine the change in temperature as four different alcohols evaporate.

Background: (put into lab book)

Copy and fill in the chart below:

Materials (put in lab book)

• Read the procedure below and list all of the materials required to complete this part of the lab.

Procedure: (READ -- DO NOT put in your lab notebook)

1. You are working with your lab partner. Each partner is responsible for two alcohols. Each partner should follow the directions below for their first alcohol. Then repeat the procedure for their second alcohol.

2. Rubber band a kimwipe tissue around the end of the thermometer making sure that the rubber band is above the thermometer's bulb and not touching it, but the bulb is completely covered by the tissue (as shown in picture).

1. Dip the thermometer in the alcohol and quickly remove it, immediately start stopwatch and read the initial temperature. Screw the lid back on the alcohol right away!!

2. Read the alcohol's temperature every 30 sec for 5 min.

3. Remove the tissue, throw it away, and get a new one. (not the rubberband)

4. Give the thermometer a minute or two for its temperature to return to room temperature and then repeat with your other alcohol.

Data: (put into notebook)

Graph: (sketch in lab notebook)

Create a graph in LoggerPro with four lines (one for each alcohol).

Temperature should be on the y-axis and time on the x-axis.

Do not curve fit to get an equation. Choose the "Connect Points" option instead to get the lines.

Use color and a key to identify each line in your sketch.

Conclusion: (answer in lab notebook)

1. In general, what happens to the temperature of an alcohol as it evaporates?

2. Complete this sentence based on what you observed in lab: The higher the formula mass of an alcohol, the _____________ the temperature change as it evaporates (not the speed at which it changed, but the actual quantity of the change).