Question

1. place a small drop of water on a square of brown paper or loose - leaf paper. describe the immediate effect.
2. place a small drop of vegetable oil on a square of the paper. describe the immediate effect.
3. wait at least 15 minutes for the paper to dry. evaluate which substance penetrates the paper and which is subject to evaporation. record your observations and conclusions in table 3.7. save the paper for comparison use with section 3.4.

table 3.7 paper test for fat

sample	observations	conclusions

|water spot|
|oil spot|

Explanation:

1. When a small drop of water is placed on paper, it may initially wet the paper surface. Water has high surface - tension and may form a bead. Over time, it will evaporate due to its relatively high volatility.
2. When a small drop of vegetable oil is placed on paper, it will spread out and penetrate the paper more easily than water because of its lower surface - tension and non - polar nature. It is less likely to evaporate quickly as it has a higher boiling point compared to water.
3. After 15 minutes, the water spot will likely have disappeared due to evaporation, while the oil spot will remain as a translucent area on the paper, indicating that oil penetrates the paper and is less subject to evaporation.

Answer:

Sample	Observations	Conclusions
Oil spot	Spreads out on the paper; remains as a translucent area after 15 minutes.	Oil penetrates the paper and is less likely to evaporate.