Class 9 is the year that marks the beginning of the process of introspection. It is that year in which you need to start understanding what you really are interested in, in term of your specialization. Knowing how machines work, gadgets work, living organism work can help and facilitate this process. There are some working models that can help generate curiosity in students and help them realize their inclination towards the subject. Let us look at some of these significant science models for class 9.

## Some experiments based on different science models for Class 9

• To understand the existence of atom and that there is a gap in each atom irrespective of their small size.

You will need one cup of water and rubbing alcohol, each. Atoms in both these liquids are not visible to the naked eye. Now, mix the two liquids together and pour them into two different cups. What would you expect? That the quantity of mixture will be equal to the quantity of water added to the quantity of alcohol. However, on pouring the mixture into two cups you will notice that the quantity of the mixture is less than expected. This is explained by the fact that there is space between the atoms of both, water and rubbing alcohol that they tend to fill up when mixed with each other. This is a simple, safe and extremely intriguing experiment.

• To understand Newton’s third law of motion, that is, every action has an equal and opposite reaction

Asking a student to sit on a chair with wheels and then throw a ball can prove this. Because the force utilized to throw the ball requires energy, the student will end up moving backwards without any external exertion or force. This is because force in one direction leading to an action resulted in a simultaneous action in the opposite direction too.

• To understand magnetic permeability

This means the ability or inability of an object to become a temporary or permanent magnet. For this experiment, you will need 400 MLS of water, 2 big magnets (permanent), 2 beakers, 50 gms of salt, 1 burette, stopwatch and measuring cylinder. First, you must add 200 MLS of water to a measuring cylinder that needs to pore via the burette. You need to note the time taken in this process for this amount of water. This is all without the presence of magnetic field.

Now, the magnets need to be placed at the bottom of the burette and the time taken needs to be measured again.

Next, add 50 grams of salt to 200 ml of water and pour this water in the cylinder such that it flows through the burette again. Subsequently, measure the time taken.

Do this 6-7 times to get an average.

On reading the measurements, you will understand that the flow of water (both with and without salt) is lower when the two magnets are placed as compared to when they are not placed.

• To understand static energy

For this, you will need a balloon and water tap. First, inflate the balloon and rub it on your head. Do this for several minutes. Now, turn the tap on so that the flow of water is slow and steady. Now bring the charged balloon close to the stream of water and observe what happens. It results in bending of the stream of water due to the presence of static energy. Rubbing the balloon against head results in the creation of static energy, which reacts against water that results in the bend.

• To understand respiration and how carbon dioxide is exhaled in the process

For this experiment, you will need a plastic bottle, a balloon, a rubber band, a measuring container, some yeast, sugar and a glass of water.

First, you mix 2 teaspoons of yeast and 1 teaspoon of sugar in a cup of water. You transfer this mixture into the bottle. Now, you place the balloon over the opening of the bottle and tightly secure it with the help of the rubber band. Leave the mixture and observe. You will see that the balloon fills up slowly. This is because the yeast is eating the sugar and in the process respiring. Respiration leads to exhaling of carbon dioxide that leads to the blowing up of the balloon. It is also true in case of living organisms.

• To understand saturation

For this experiment, you will need a wooden chopstick, clothespin, a cup of water, 3 cups of sugar and a narrow glass.

First, you need to clip the chopstick into the clothespin such that it hands downwards inside the glass. It should be such that it is 1 inch away from the bottom of the glass. Once this set up is ready keep it aside. Then pour the water into a pan and boil it (use an adult’s help for this). Then put the 1/4th cup of sugar in the boiling water and keep stirring it till it dissolves. After it dissolves, keep adding more sugar until no more of it dissolves. Once it is done, remove it from the heat and let it cool for 20-30 minutes.

Then pour this solution into the glass and dip the chopstick making sure that it hangs down without touching the walls of the glass. Let it cool. In the next 3-7 days, you will notice sugar crystals growing on the clothespin. This happens because once you mix water and sugar, you make a supersaturated solution that is water can contain sugar only when the water is hot. Once you let it cool, the sugar comes out and becomes crystals on the chopstick.

All these experiments enable kids to foster a sense of interest in science and once the interest is generated, it allows the student to take a decision as to whether science should be their preference over other streams or not. These simple experiments prove to give an active head start to the learning process and can be performed at home with simple tools.

Also check out our article on Maths project for class 9 here.

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