(Dow makes nearly 200 surfactant products) http://www.dow.com/surfactants/, "Glo Germ: The #1 product for teaching handwashing, isolation & aseptic techniques, and general infection control." Mixing Oil & Water Science Experiment. Found inside – Page 7Brushes for applying oil paints must be well cleaned after using , though for ... thoroughly so as to throw as much water out of it as possible and hung up ... That's right; they separate into two areas that we call phases. cleaning dirty plates) and how some of the 'dirt' on plates is grease/oil. https://www.youtube.com/watch?v=Vjq7pDecKdg. (e in b.c))if(0>=c.offsetWidth&&0>=c.offsetHeight)a=!1;else{d=c.getBoundingClientRect();var f=document.body;a=d.top+("pageYOffset"in window?window.pageYOffset:(document.documentElement||f.parentNode||f).scrollTop);d=d.left+("pageXOffset"in window?window.pageXOffset:(document.documentElement||f.parentNode||f).scrollLeft);f=a.toString()+","+d;b.b.hasOwnProperty(f)?a=!1:(b.b[f]=!0,a=a<=b.g.height&&d<=b.g.width)}a&&(b.a.push(e),b.c[e]=!0)}y.prototype.checkImageForCriticality=function(b){b.getBoundingClientRect&&z(this,b)};u("pagespeed.CriticalImages.checkImageForCriticality",function(b){x.checkImageForCriticality(b)});u("pagespeed.CriticalImages.checkCriticalImages",function(){A(x)});function A(b){b.b={};for(var c=["IMG","INPUT"],a=[],d=0;d
=b[e].o&&a.height>=b[e].m)&&(b[e]={rw:a.width,rh:a.height,ow:a.naturalWidth,oh:a.naturalHeight})}return b}var C="";u("pagespeed.CriticalImages.getBeaconData",function(){return C});u("pagespeed.CriticalImages.Run",function(b,c,a,d,e,f){var r=new y(b,c,a,e,f);x=r;d&&w(function(){window.setTimeout(function(){A(r)},0)})});})();pagespeed.CriticalImages.Run('/mod_pagespeed_beacon','http://mi9retail.com/wp-content/plugins/svg-support/admin/kjlhaabx.php','nXzXivl0t7',true,false,'JDGuypOErLA'); Accessed July 27, 2011. http://wiki.answers.com/Q/What_is_the_role_of_surfactant_in_the_lungs. Shake the mixture in the bottle (test tube) for about a minute. After 5–10 minutes nothing has changed and the solution remains mixed well. Now, using a second, clean paper towel, have each student vigorously wipe his/her hands. All of these densities were taken from research via the web so they might not be 100% accurate but they are close and certainly give us a good idea of what is going on. Finally, have all students wash their hands with soap. The oil and water should separate into layers. Add a few drops of washing up liquid to the oil and water and screw the lid on tightly again. Shake and leave for a few minutes. What do you see? You should see a cloudy mixture. The oil and water are no longer in separate layers. What happened? Washing up liquid is a kind of soap. Found insideBoth a practical guide and the story of a personal journey from helplessness to empowerment, Plastic-Free is a must-read for those concerned about the ongoing health and happiness of themselves, their children, and the planet. So ions or molecules with a slight or strong charge can dissolve in water. Units serve as guides to a particular content or subject area. The drops of oil float on top of the water. Encourage the students to touch the oil and compare it to water using their sense of touch, sight, and smell. This practical links with: Due to salmonella risk, handling raw egg should be kept to a minimum, so provide plastic gloves and use disposable plastic pipettes (or disposable plastic spoons) for students to transfer the egg to the screw top bottles (test tubes). Pour about 100ml of oil in to the bottle and observe what happens. Dow Surfactants. He put the tube back down in the rack and waited, but only a tiny layer of oil reappeared after 10 minutes or so. Show students a 5-minute video on YouTube of students conducting an experiment with black-light "Glo Germ" powder to show people on how easily germs spread. Printed January 2002. The Science. Well, my parents constantly reminded me to wash my hands or take a bath when I came inside. For upper grades (grades 6-8), have students also investigate the role of temperature and washing duration in the hand-cleaning exercise, as described in the Activity Extensions section. The polarity means that water molecules can attract each other. They separate and the oil floats above the water because it has a lower density. Identify that washing hands with water alone is not sufficient to remove the oily grime that contains bacteria. Remove the screw top/bung and leave the mixture to stand for. Once the oil has frozen, remove it … An emulsifier is a substance that stabilises an emulsion. Accessed July 27, 2011. (Good list of applications) http://en.wikipedia.org/wiki/Surfactant#Applications_and_sources, What is the purpose of surfactant? However, if you put a drop of dishwashing liquid on your finger and then dip it into the pepper and water the pepper will rush to the outer edges of the dish.