This video describes phases of matter. You will learn about melting, freezing, evaporations, and condensation.
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Sunday, July 26, 2020
States of Matter ( solid, liquid, gas )
This video describes about states of matter ( solid, liquid, gas ). You will learn about solid, liquid and gas. And also examples of solid, liquid and gas.
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Color changing cabbage
This video describes about the color changing cabbage. You will need bowl, water, lemon water, sugar water, detergent, vinegar, red cabbage solution and baking soda. You can easily identify which of the household items are acid or base.
This is the great way to introduce the acid and base concept to kids. Red cabbage contains a chemical called anthocyanin that changes color depending on the acidity of its environment. The color of the juice changes is response to changes in its hydrogen ion concentration. pH scale describes the concentration of hydrogen ions in a solution
pH 7 means the solution is neutral. Neutral solution turn the indicator purple.
pH less than 7 means the solution is acidic. Acidic solution turn the indicator reddish- pink.
pH greater than 7 means the solution is basic. Basic solution turn the indicator bluish-green or yellow.
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Tuesday, July 21, 2020
Bouncy Egg
This video describes how to make a bouncy egg. You will need jar, vinegar and egg. After 48 hours later you can get a bouncy egg.
Bouncy Egg:
When you place the egg into the vinegar, you can see bubbles on the surface. These bubbles are a chemical reaction between acetic acid ( vinegar ) and calcium carbonate ( egg shell ). When an acid and base mix they form carbon dioxide gas. This reaction creates carbon dioxide gas and breaks down the egg shell in the process.
2CH3COOH + CaCO3 ———> Ca(CH3COO)2 + H2O + CO2
Why ?
You can also observe that the egg gets large as it sits in the vinegar. Because of Osmosis. In some of the water in the vinegar solution and it travelled through egg membrane and it equalizes the concentration of water on both the sides of the membrane . So the water flow through semipermeable membrane is called Osmosis.
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Difference between backing soda and baking powder
This video describes difference between baking soda and baking powder. You will need two bowl, baking soda, baking powder and water.
Baking Soda Vs Baking Powder: Baking soda is pure sodium bicarbonate, which requires acid and liquids like yogurt, buttermilk etc.. It activated chemical reaction produces bubbles of carbon dioxide and help baked good rise.
Baking powder includes sodium bicarbonate as well as an acid. It only need a liquid to become activated so you must bake recipes that include this product immediately after mixing.
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Baking soda and Lemon Water Reaction
This video describes how baking soda react with lemon water. You will need baking soda, bowl of water and bowel of lemon juice.
Lemon - Baking soda Reaction: When the lemon juice (citric acid ) contact with the baking soda ( carbonate ) a chemical reaction took place, creating carbon dioxide gas. As you know, carbon dioxide is the same gas that is added to the sodas to give their fizz.
3NaHCO3 + C6H8O7 ———> Na3C6H5O7 + 3H2O + 3CO2
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Monday, July 20, 2020
Why does the water rise
In this video you can learn how does the water rise and why the candle flame blew out. You will need plate, water, candle and glass tumbler.
Rising water: The flame heats the air inside the glass tumbler and hot air expands quickly. When the candle is trapped in the glass tumbler it quickly use the available oxygen. Once the candle run out of oxygen, the candle burns out and the remaining air inside cools down. The contraction creates lower pressure inside the glass tumbler. The high pressure air outside the glass tumbler to push the water down into the plate, allowing the water to be pushed upwards into the glass tumbler.
You can understand how the temperature affects pressure.
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Disappearing ink 2
In this video, we can learn about how the disappearing ink will work. I used thymolphthalein, litmus paper and water.
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Touchable bubble
In this video, you’ll learn about the touchable bubble. Usually bubble burst when they come and contact with just about anythings. But in touchable bubble we can touch it and also it will bounce.
How to make soft jelly
In this video how the jelly crystals change into soft jelly. you will need jelly crystals, water and food coloring.
Yeast inflating balloon
In this video, you will learn how does yeast make carbon dioxide bubbles. And it makes pizza, bread, muffin and donuts dough rise. You will need sugar, warm water, yeast, soda bottle and balloon.
Fermentation :
Yeast performs fermentation to obtain energy by converting sugar into alcohol and carbon dioxide.
C6H12O6 ———> 2C2H5OH + 2CO2
The carbon dioxide gas bubbles, causing the bread to rise.
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Sunday, July 19, 2020
How to make bouncy ball
This video describes how to make bouncy ball at home. With in 5- 10 mins you can make a nice bouncy ball at home. you will need water, PVA (polyvinyl acetate) and bouncy ball mold.
Bouncing balls were originally made of natural rubber, through now they can made from plastic and other polymers. At bouncy ball the bouncing activity made from a polymer. Polymers are molecules made up of similar chemical units bonded together.
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How to make a worm goo
This video describes how we can make worm goo at home. you will need calcium chloride, warm water, and sodium alginate.It looks like a worm.
Chemical Names:
sodium alginate and calcium chloride. Sodium alginate is a common food additive as a thickener and gelling agent ice cream, jellies and jams.
Reaction :
Sodium alginate is squirted into the calcium chloride solution. Calcium chloride solution act as an activator. It changes the sodium alginate from liquid to gel like leading to the formation of worm.
2NaC6H7O6 + CaCl2 ————> 2NaCl + CaC12H14O16
The calcium ions replace the sodium ions and link the polymer chains together. This chemical reaction is named as " Spherification "
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Friday, July 17, 2020
Disappearing Ink
Disappearing Ink :
Disappearing ink is a blue water based solution. Squirt the solution onto the dress materials and in a few seconds the blue stain will disappear. Due to its color change with pH, the material used to make the disappearing ink was identified as an acid-base indicator called thymolphthalein.
- Dissolve the thymolphthalein in ethyl alcohol and water solution.
- Add sodium hydroxide solution dropwise until the solution turns a dark blue.
Reaction:
Sodium hydroxide cause the indicator of thymolphthalein solution turn the dark blue color. Use dropper to put a few drops of thymolphthalein onto a cloth material or paper. Now it reacts with the carbon dioxide in the air.
Formation:
CO2 + H2O ----> H2CO3
The carbonic acid then reacts with the sodium hydroxide in a neutralization reaction. This reaction form sodium carbonate which is a washing soda and the ink disappears.
Neutralization :
2Na(OH) + H2CO3 -------> Na2CO3 + 2H2O
The carbon dioxide is the acid that neutralizes the base sodium hydroxide. The color of the thymolphthalein is colorless in the presence of acid.
We used paper. Paper allows less interaction with air, so the color change reaction takes more time. In a few second the stain will disappear. If you spray over the spot with ammonia the color will return.
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Formation Of Ionic Bond
This video is describe about Formation of ionic bond.
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