Why does the needle sink after soap is added to the water? Give a scientific reason to earn points.
Keep In Mind that a soap molecule is long with one end attracted to oil molecules
and that one end of a soap molecule is polar, and the other end is nonpolar. Soap will dssolve , and the soap molecules will float freely in water. And a sewing needle will rest upon the surface of water. If powderered laundry detergent is gently spinkeld near the needle, the needle will eventually sink.
2006-09-26 02:20:52 · 5 answers · asked by Zman 1 in Science & Mathematics ➔ Biology
has to do with how the soap effects surface tension.
2006-09-26 02:24:00 · answer #1 · answered by Anonymous · 0⤊ 0⤋
needle floats in water due to the surface tension of water.Addition of detergents will decrease the surface tension that is why needle sinks in water.
2006-09-26 02:26:13 · answer #2 · answered by antappan 1 · 2⤊ 0⤋
I always thought that the needle was simple allergic to the soap, so it dropped to the bottom as quickly as possible, thinking it could get away from the soap.
Obviously, somebody lied to me!
Good luck and have fun :-)
2006-09-26 02:28:53 · answer #3 · answered by no1home2day 7 · 0⤊ 0⤋
Soap water has no surface tension.
2006-09-26 02:24:50 · answer #4 · answered by J.SWAMY I ఇ జ స్వామి 7 · 0⤊ 0⤋
It disrupts the surface tension.
2006-09-26 02:28:45 · answer #5 · answered by chemistry_freako 3 · 0⤊ 0⤋