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Do different liquids evaporate at the same rate

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Megan Johannes

on 20 March 2014

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Transcript of Do different liquids evaporate at the same rate

Do different liquids evaporate at the same rate?
By: Megan Johannes
Introduction
The purpose of my experiment is to determine if different liquids evaporate at the same rate. I choose this experiment because I searched online for interesting science fair experiments and this one was the most appealing of the ones I looked at. It also is under the category of chemistry which I find interesting.
Variables
The independent variable is the type of liquid. The dependent variable is the rate of evaporation. The constants or controlled variables are the containers the liquids are kept in, where they are kept, and the amount of liquid in each container.
Materials

- Data collection sheet
- Camera
- 4 glass measuring cups (measures in mL)
- 250 ml orange juice
- 250 ml water
- 250 ml vegetable oil
- 250 ml rubbing alcohol

Conclusions
My hypothesis that orange juice would evaporate the fastest was incorrect. I think it was incorrect because the orange juice started separating towards the end, which in a small way slowed down the evaporation. Also my hypothesis that rubbing alcohol would be the second fastest was incorrect. I believe it was incorrect because the rubbing alcohol’s active ingredient is isopropyl alcohol and isopropyl alcohol has a mass of about 60 Da. My hypothesis that vegetable oil would evaporate the slowest was correct. My hypothesis that water would evaporate the third fastest was incorrect. I believe it was incorrect because rubbing alcohol is lighter than water. Also, at the beginning of my experiment I used nail polish remover instead of vegetable oil, but after the first night of being set out the nail polish remover dissolved part of the beaker it was in and spilled into the tray it was in.
Hypothesis
Based on the research I’ve done, my hypothesis is that different liquids will evaporate at different rates. My hypothesis is this because different liquids molecules will probably have different energy levels. And evaporation is mostly about the individual molecule’s energy. Also, I believe that the orange juice will evaporate the fastest, followed by rubbing alcohol. Then water, followed by vegetable oil.

The purpose of this experiment was to determine if different liquids evaporate at the same rate. Four liquids were tested: vegetable oil, water, orange juice, and rubbing alcohol. The hypothesis for this experiment was that the orange juice would evaporate the fastest, followed by rubbing alcohol, then water, followed by vegetable oil. The procedures were to: pour 250 ml of water into beaker, pour 250 ml of orange juice into beaker. Then pour 250 ml of rubbing alcohol into beaker and pour 250 ml of vegetable oil into beaker. Next, set beakers in a stable environment. Finally, check beaker amounts every other day and note amounts, repeat for about 10 days.
The ending measurements were orange juice: 190 ml, water: 175 ml, rubbing alcohol: 125 ml, and vegetable oil: 250 ml. My hypothesis that orange juice would evaporate the fastest was incorrect. I think it was incorrect because the orange juice started separating towards the end, which in a small way slowed down the evaporation. Also my hypothesis that rubbing alcohol would be the second fastest was incorrect. I believe it was incorrect because the rubbing alcohol’s active ingredient is isopropyl alcohol and isopropyl alcohol has a mass of about 60 Da. My hypothesis that vegetable oil would evaporate the slowest was correct. My hypothesis that water would evaporate the third fastest was incorrect. I believe it was incorrect because rubbing alcohol is lighter than water.


Abstract
Do different liquids evaporate at the same rate?
Full transcript