Science

Do it yourself experiments

1. How to make Slime!

You will need:

•1/4 cup of water

•1/4 cup of white craft glue (like Elmer’s glue)

•1/4 cup of liquid starch (used for clothes)

•Food coloring (optional)

•Mixing bowl

•Mixing spoon

What to do

 

•Pour all of the the glue into the mixing bowl.

•Pour all of the water to the mixing bowl with the glue.

•Stir the glue and water together.

•Add your food color now – about 6 drops should do it.

•Now add the liquid starch and stir it in.

•It should be nice and blobby by now. As you play with your slimy concoction, it will become more stretchy and easier to hold.

•Explore your slimy creation and store it in a zip bag when you are not using it.

How it works:

The glue is a liquid polymer. This means that the tiny molecules in the glue are in strands like a chain. When you add the liquid starch, the strands of the polymer glue hold together, giving it its slimy feel. The starch acts as a cross-linker that links all the polymer strands together



2. Blow up a Balloon with Yeast

 

You will need:

•A packet of yeast (available in the grocery store)

•A small, clean, clear, plastic soda bottle (16 oz. or smaller)

•1 teaspoon of sugar

•Some warm water

•A small balloon



What to do:

•Fill the bottle up with about one inch of warm water.

(When yeast is cold or dry the microorganisms are resting.)

• Add the entire yeast packet and gently swirl the bottle a few seconds.

(As the yeast dissolves, it becomes active – it comes to life! Don’t bother looking for movement, yeast is a microscopicungus organism.

•Add the sugar and swirl it around some more.

Like people, yeast needs energy (food) to be active, so we will give it sugar. Now the yeast is “eating!”

•Blow up the balloon a few times to stretch it out then place the neck of the balloon over the neck of the bottle.

• Let the bottle sit in a warm place for about 20 minutes if all goes well the balloon will begin to inflate!

How it works:

As the yeast eats the sugar, it releases a gas called carbon dioxide. The gas fills the bottle and then fills the balloon as more gas is created. We all know that there are “holes” in bread, but how are they made? The answer sounds a little like the plot of a horror movie. Most breads are made using YEAST. Believe it or not, yeast is actually living microorganisms! When bread is made, the yeast becomes spread out in flour. Each bit of yeast makes tiny gas bubbles and that puts millions of bubbles (holes) in our bread before it gets baked. Naturalist’s note – The yeast used in this experiment are the related species and strains of Saccharomyces cervisiae. Anyway, when the bread gets baked in the oven, the yeast dies and leaves all those bubbles (holes) in the bread.

Source - https://sciencebob.com/category/experiments/








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Printable version | Oct 24, 2021 7:09:05 PM | https://www.thehindu.com/in-school/sh-science/do-it-yourself-experiments/article8296304.ece

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