Science Term 3 by Claudia McCartney https://padlet.com/claudia_mccartney/e66uu499ekx9 en-us 2017-08-10 00:43:45 UTC 2017-09-21 01:13:41 UTC hello@padlet.com Experiment Ideas claudia_mccartney https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180548261 Elephants toothpaste experiment. Mixing Hydrogen Peroxide, dry yeast, warm water and dish washing liquid to create a foam.]]> 2017-08-10 00:51:52 UTC https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180548261 Materials I need claudia_mccartney https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180548406
  • A clean 16 ounce plastic soda bottle
  • 1/2 cup 20-volume hydrogen peroxide liquid (20-volume is a 6% solution, ask an adult to get this from a beauty supply store or hair salon)
  • 1 Tablespoon (one packet) of dry yeast
  • 3 Tablespoons of warm water
  • Liquid dish washing soap
  • Food coloring
  • Small cup
  • Safety goggles
    • ]]>     2017-08-10 00:53:12 UTC https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180548406     Resources Used claudia_mccartney https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180870907 https://sciencebob.com/fantastic-foamy-fountain/

    http://now.ccv.edu/miss-vermont-brings-elephants-toothpaste-ccv/]]>     2017-08-14 03:24:15 UTC https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180870907     Safety Notes claudia_mccartney https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180870995 - The foam will overflow from the bottle, so be sure to do this experiment on a washable surface, or place the bottle on a tray.]]> 2017-08-14 03:25:43 UTC https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180870995 WHAT TO DO! claudia_mccartney https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180871047
  • Hydrogen peroxide can irritate skin and eyes, so put on those safety goggles and ask an adult to carefully pour the hydrogen peroxide into the bottle.
  • Add 8 drops of your favorite food coloring into the bottle.
  • Add about 1 tablespoon of liquid dish soap into the bottle and swish the bottle around a bit to mix it.
  • In a separate small cup, combine the warm water and the yeast together and mix for about 30 seconds.
  • Now the adventure starts! Pour the yeast water mixture into the bottle (a funnel helps here) and watch the foaminess begin!
    • ]]>     2017-08-14 03:26:27 UTC https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180871047     Questions claudia_mccartney https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180871147
  • Does the amount of yeast change the amount of foam produced?
  • Does the experiment work as well if you add the dry yeast without mixing it with water?
  • Does the size of the bottle affect the amount of foam produced?

    • ]]>     2017-08-14 03:27:49 UTC https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/180871147     What's Happening claudia_mccartney https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/189578524
    The foam is made as the dishwashing detergent traps tiny oxygen bubbles created by the chemical reaction that is happening inside the bottle. The thick foam oozes out of the top of the bottle and looks like toothpaste when toothpaste is being squeezed out of its tube. The activity is called ’Elephant’s Toothpaste’ because the large stream of foam looks like toothpaste that is big enough for an elephant!
    Hydrogen peroxide is a molecule made up of hydrogen atoms and oxygen atoms. It can be expressed using the chemical formula, 2H2O2. Under the right conditions, hydrogen peroxide will undergo a chemical reaction to break down into two parts, oxygen and water.
    We can write out this decomposition reaction as a chemical equation:
    hydrogen peroxide --› water + oxygen
    2H2O2 --› 2H2O + O2
    When a chemical that is made up of only one molecule breaks down into two different, smaller molecules, it’s called a decomposition reaction. This particular decomposition reaction is also an ’exothermic’ reaction, meaning it gives off heat. If you feel the sides of the bottle, the plastic should feel quite warm.
    Yeast contains an enzyme called catalase. The enzyme is called catalase because it works as a ’catalyst’ in this reaction. A catalyst is a substance that speeds up the rate of a chemical reaction without changing its products. The yeast is added to the hydrogen peroxide to speed up the reaction. The catalase in the yeast speeds up the process of breaking down the hydrogen peroxide and thus produces oxygen and water more quickly. The oxygen gets trapped by the dishwashing detergent as many tiny bubbles.

    The following information is from "https://www.questacon.edu.au/outreach/programs/science-circus/videos/elephants-toothpaste"
    ]]>     2017-09-21 01:13:03 UTC https://padlet.com/claudia_mccartney/e66uu499ekx9/wish/189578524