Elephant silhouette vector set The cheerful elephant. Eps 10 Elephant Tattoo logo vector Vector background with elephant. Animals vector design concept, glyph style pictogram on white background, use for web and app. Standing safari animal simple silhouette. Wash the foam down the sink when you are done with the activity.Silhouette with elephant abstract line vector illustration Elephant solid icon. If you tried the activity without dish soap, the reaction probably will still made bubbles-but not foam. Once one of them runs out it stops making new foam. The reaction continues as long as there is some hydrogen peroxide and yeast left. The dish soap that you added to your reaction, however, traps these gas bubbles, forming a foam. Oxygen is a gas and therefore wants to escape the liquid. What makes the foam appear? When the hydrogen peroxide comes into contact with the yeast it starts breaking down into water and oxygen. You probably saw lots of bubbles and foam in this activity. What happens if you use a bottle with a narrower or wider neck-or a cylindrical drinking glass with no neck? What happens? How was the result different?Įxtra: Try the activity with different-shaped containers. Pour the yeast mixture into the bottle then quickly step back, and watch your reaction go! What happens? How long does the reaction last?Įxtra: Try the activity without the dish soap. In a measuring cup mix together one tablespoon of yeast and three tablespoons of warm water. Let them drip down the inside of the bottle, but do not mix. If you want to give your foam stripes like some toothpastes, put the drops along the inside rim of the bottle’s mouth. If you want to make your foam a single color, add a few drops of food coloring directly into the hydrogen peroxide, and swirl the bottle gently to mix. Measure 1/2 cup of hydrogen peroxide, and carefully pour it into the bottle.Īdd a big squirt of dish soap into the bottle, and swirl gently to mix. Place your plastic bottle on the tray or tub so that it is easy to clean up all the foam. Gather your materials in the location where you plan to do your activity. (Note: although the product of this activity resembles toothpaste, it is not toothpaste, so do not attempt to use it!) Put on your safety glasses to do this activity because hydrogen peroxide can irritate your eyes. Location for the activity that can tolerate spills (of hydrogen peroxide as well as possibly food coloring), such as a kitchen or bathroom-or an outdoor locationĭifferent-shaped bottles or glasses (optional) This foam looks like a giant squeeze of toothpaste-almost big enough for an elephant!ĭry yeast (found in the baking section of the grocery store) But adding a little dish soap provides additional surface tension, allowing the bubbles to get trapped and creating lots of foam. These bubbles would usually escape from the liquid and pop quickly. This means that if you mix yeast with hydrogen peroxide, the hydrogen peroxide will rapidly break down into water and oxygen gas. Catalase is present in almost all living things that are exposed to oxygen, and it helps them break down naturally occurring hydrogen peroxide. Yeast is an organism that contains a special chemical called catalase that can act as a catalyst to help break down hydrogen peroxide. But you can make that reaction happen faster! How? By adding a catalyst. Normally this breakdown happens very slowly. When hydrogen peroxide breaks down, it turns into oxygen (O 2) and water (H 2O). By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today. If you're enjoying this article, consider supporting our award-winning journalism by subscribing. It also breaks down when exposed to light, which is why it usually comes in dark brown bottles. You usually find it in a 3 percent concentration (although higher concentrations are available, they are more dangerous and must be handled carefully). It is available in different strengths, or concentrations. But what is it? It is a liquid made from hydrogen atoms and oxygen atoms (its chemical formula is H 2O 2). You might be familiar with hydrogen peroxide as an antiseptic used to clean cuts and scrapes, which it does by killing bacteria. With just a few ingredients you can make something that looks like foamy toothpaste being squeezed from a tube-but so big that it looks almost fit for an elephant! Create a giant foaming reaction, and use science to wow your friends with this classic activity.
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