CER Water by Lincoln Community School https://padlet.com/LincolnCS/wl1fvyqpm4vc31do What happened to the black pepper on the surface of the water when a soapy finger was placed in the middle?  en-us 2021-10-03 18:07:35 UTC 2021-10-05 15:13:44 UTC hello@padlet.com John jmorrison64 https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793415753 The soap broke the surface tension of the water in a ring, making the water pull the pepper along with it.
As soon as the soap entered the water, the black pepper quickly moved away from the finger in a circular pattern.
This shows that when the soap entered the water, it broke the surface tension slowly outwards from the entry point, instead of all at once, when the hydrogen bonds broke in an outward fashion, the pepper was pulled along out to the edge, as it was being held on top of the water through surface tension.

]]> 2021-10-05 15:06:20 UTC https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793415753 Janelle jharmse https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793416166 when the soapy finger was placed into the water with a layer of black pepper, the pepper scattered to the sides. This is because the pepper is hydrophobic meaning it doesnt dissolve or mix into water, when the soap was introduced, the surface tension was broken causing the pepper to scatter. ]]> 2021-10-05 15:06:25 UTC https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793416166 The pepper seemed to repel. The pepper floated because of cohesion, but as we know from the coin experiment, when there is water in soap it breaks down the hydrogen bonds. aluke3 https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793417608 2021-10-05 15:06:47 UTC https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793417608 https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793430521 The black pepper on the water was repelled from the soapy finger. The black pepper was able to sit on top of the water and when a finger with soap touched the surface of the water, the black pepper moved away to the very edge of the water. The black pepper was able to sit on top of the water because of surface tension. Surface tension is how hard it is to break a liquid's surface. Also, the black pepper moved away because when a soapy finger broke the surface tension and carried the pepper away. ]]> 2021-10-05 15:10:16 UTC https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793430521 CER Water - Explanation https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793434219 The addition of soap broke the surface tension of water. The pepper went towards the sides and was no longer floating because the surface tension broke ]]> 2021-10-05 15:11:13 UTC https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793434219 Claim :The black pepper ran away from the soap. Evidence: As soon as John put his soapy finger in the water all of the black pepper shot away from the spot John's finger was placed. Reasoning: The black pepper went away from the soap because maybe the soap changes the surface tension and so then the black pepper shoots away from the soap. Surface tension is when liquid molecules stick together at the top of the surface due to water being cohesive. Cohesion is when molecules of the same substance stick together. https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793442233 2021-10-05 15:13:26 UTC https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793442233 CER Water dokugo https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793443397 The black pepper separated from the soapy finger as soon as the soapy finger made contact with the water in the middle, I think this is because the surface tension makes it so that when the soapy hand makes contact with the water the black pepper rises to the top of the water so to keep the surface tension going the black pepper moves away from the soapy hand to keep the surface tension going. ]]> 2021-10-05 15:13:44 UTC https://padlet.com/LincolnCS/wl1fvyqpm4vc31do/wish/1793443397