Balloon up using chemical reactions

What you'll need:

1. Balloon
2. About 40 ml of water (a cup is about 250 ml so you don't need much)
3. Soft drink bottle
4. Drinking straw
5. Juice from a lemon
6. 1 teaspoon of baking soda

How to do it:

1. Before you begin, make sure that you stretch out the balloon to make it as easy as possible to inflate.
2. Pour the 40 ml of water into the soft drink bottle.
3. Add the teaspoon of baking soda and stir it around with the straw until it has dissolved.
4. Pour the lemon juice in and quickly put the stretched balloon over the mouth of the bottle.

What's going on:

If all goes well then your balloon should inflate! Adding the lemon juice to the baking soda creates a chemical reaction. The baking soda is a base(Sodium Bicarbonate), while the lemon juice is an acid (citric acid), when the two combine they create carbon dioxide (CO2). The gas rises up and escapes through the soft drink bottle, it doesn't however escape the balloon, pushing it outwards and blowing it up. If you don't have any lemons then you can substitute the lemon juice for vinegar.

NaHCO3 + C6H8O7 ---->  3 CO2 + 3 H2O + Na3C6H5O

Floating Ball

What you need:

1. A small light ball (like a ping pong ball) covered with foil

2. A circular piece of paper

3. A straw

4. Some tape

How to do:

1. Cut a slit on the circular piece of paper to the center.

2. Roll it into a funnel shape and tape it inside and outside.

3. Cut a small slit just enough to let the short end of the straw to pass through.

4. Insert the short end of the straw through the hole (not completely but just enough to stick it to the funnel) and tape it to the funnel.

5. Place the ball inside the funnel and blow through the other end of the straw. You would see the ball floating.

Why it happens:

When you blow air through the straw into the funnel, it gives the required force to counter the effect of gravity on the ball. This makes the ball appear to float.

Popsicle Stick Catapult

What you need:

1. 9 Popsicle sticks

2. 5 rubber bands

3. A projectile of your choice

How to make it:

1. Stack four Popsicle sticks. Using a rubber band at each end, squeeze the bundle tightly together. 

2. Place the remaining two Popsicle sticks together. Bundle only one end together using an additional rubber band. 

3. Pry the un-bundled end open enough to be able to slide the set of four sticks in between perpendicularly to form a cross. Slide the bundle of four sticks down as closely as you can get it to the rubber band that’s holding the two sticks together. 

4. Finish your catapult by securing the body to the wings (diagonally at the point where the Popsicle sticks intersect) by crisscrossing a rubber band from the back of the right wing to the front of the left several times. Repeat with the final rubber band. 

5. Place your projectile at the end of the Popsicle stick that is highest in the air. Hold the set of four sticks with one hand, and push down on the angled stick just behind the projectile. 

6. Release your projectile!

Whats going on:
A lever is a simple machine that uses a beam attached to a pivoting hinge, or fulcrum, to amplify the amount of force applied to one end. The lever provides mechanical advantage, or leverage, to make it easier to perform work on the other end.
Catapults were used in warfare for centuries, and are a great example of the power of a lever in action. By affixing a popsicle stick at a right angle (T-shape) to another, you are effectively using the bottom one as the fulcrum for the top. By adding force to change the shape of the bow or popsicle stick from its original resting position, you add stored (potential) energy to the wood. By stacking the
popsicle sticks to increase the height of the fulcrum, then moving the end of the lever higher in the air (longer lever), you allow for more distance for the lever to build more potential energy as you pull it down. When you release your catapult, you’re quickly transferring that stored potential energy into kinetic energy that sends your projectile flying.

Soap water and pepper expiriment

Materials

1. Soap
2. Bowl of water
3. Pepper (powder)
4. Some fingers

How to do it

1. Take a bowl of water and put some powdered pepper over it.
2. Dip your finger into it 
3. Note down the observation 
4. Now dip your finger in soap water and repeat the same experiment
5. Note down the observation

What happens

1. When you dip your finger no change is noted
2. When you dip your finger in soap and repeat the same, the pepper moves away and their arrangement is broken

Why it happens

Soap breaks the surface tension of water. This causes the pepper to move away along with the water. That is why kit looks as if the soap repeals pepper.

Balloon Rocket

Materials Required

1. Balloon
2. Straw
3. String
4. Two chairs

Procedure

1. Take the straw and stick it to the balloon and push the string through the straw.
2. Tie two ends of the string to the two chairs.
3. Inflate the balloon and let it go 

Observation and reason

1. The balloon goes woosssshhhhhh.
2. It is because of the imbalance between the two ends of the balloon.

Parachute

What you'll need:

1.      A plastic bag or light material

2.      Scissors

3.      String

4.      A small object to act as the weight, a little action figure would be perfect.

Instructions:

1.      Cut out a large square from your plastic bag or material.

2.      Trim the edges so it looks like an octagon (an eight sided shape).

3.      Cut a small whole near the edge of each side.

4.      Attach 8 pieces of string of the same length to each of the holes.

5.      Tie the pieces of string to the object you are using as a weight.

6.      Use a chair or find a high spot to drop your parachute and test how well it worked, remember that you want it to drop as slow as possible.

What's happening?

Hopefully your parachute will descend slowly to the ground, giving your weight a comfortable landing. When you release the parachute the weight pulls down on the strings and opens up a large surface area of material that uses air resistance to slow it down. The larger the surface area the more air resistance and the slower the parachute will drop. Cutting a small hole in the middle of the parachute will allow air to slowly pass through it rather than spilling out over one side, this should help the parachute fall straighter.

A can rolls on its own

Materials Required

1. Empty soda cans.

2. blown-up balloon

3. A head of hair

How do I Io It

1. Place the can on its side on a flat smooth surface like a table or a smooth floor.
2. Rub the blown up balloon back and forth through your hair really fast.
3. Now the fun part - Hold the balloon close to the can without actually touching the can. The           can will start to roll towards the balloon without you even touching it!

    Try This Too: While you've got the balloon out, tear up part of a tissue into tiny pieces about       1/4 inch (.5 cm) big. Rub the balloon in your hair again and bring it close to the tissue pieces.     They will be attracted to the balloon and then jump away.

What is happening?

When you rub the balloon through your hair, invisible electrons (with a negative charge) buildup on the surface of the balloon. This is called static electricity, which means "non-moving electricity" The electrons have the power to pull very light objects (with a positive charge) toward them - like the soda can.

Best Plane using cardboard and straw

Materials Required
1. A regular plastic drinking straw
2. 3 X 5 inch index card or stiff paper
3. Tape
4. Scissors

How Do I Do It
1. Cut the index card or stiff paper into 3 separate pieces that measure        1 inch (2.5 cm) by 5 inches (13 cm.)
2. Take 2 of the pieces of paper and tape them together into a hoop as      shown. Be sure to overlap the pieces about half an inch (1 cm) so that they keep a nice round shape once      taped.
3. Use the last strip of paper to make a smaller hoop, overlapping the         edges a bit like before.
4. Tape the paper loops to the ends of the straw as shown below.               (notice that the straw is lined up on the inside of the loops)
5. That's it! Now hold the straw in the middle with the hoops on top and     throw it in the air similar to how you might throw a dart angled slightly up. With some practice you can          get it to go farther than many paper airplanes.

Rocket Using air pump

Materials
1. Bottle
2. Cork cap which fits the bottle tightly
3. Cello tape
4. Air pump
5. Scissors

How Do I Do It
1. Take the bottle and connect the air pump using tape, after cutting the base to the correct size of the pump's nozzle.
2. Half fill the bottle with water and shut the bottle using the cork.
3. Keep filling air and the cork would eventually blast out from the bottle

Enjoy

How to make a rocket

Materials required
1. A Bottle
2. A Cork that will fit the bottle tightly
3. A Cardboard piece
4. Baking Soda
5. Water
6. Lime juice

How Do I Do It
1. Take the bottle and half fill it with water
2. Pour lemon juice and mix it with water
3. Put baking soda into the bottle and fix the cork on it tightly
4. Shake the bottle well and keep it down
5. Go back a few feet and see what happens

What Will Happen And Why
1. The cork will shoot through the air with a big blast and will fall down
2. This happens because the baking soda reacts with lemon juice which is an acid and produce carbon dioxide water and salt
3. The carbon dioxide makes the cork blast out and fly

Balloon Powered Car Best out of Waste

Materials
1. 4 CDs
2. 10-15 straws
3. Sticky tape
4. A cardboard box
5. Some Barbecue sticks
6. Scissors

How Do I Do It
1. Take 5-7 straws and push it into two CDs  and take the other straws to fill the hole of the other two CDs
2. Push a barbecue stick on one straw of the two sets of wheels
3. Stick another barbecue on the barbecue sticks to stick them together
4. Take the cardboard box (a small one only) and pierce two sticks through it
5. Stick it onto the barbecue sticks joining the wheels
6. Take two double sided tape and put it on the box
7. Inflate the balloon and place it on the double sided tape and woooshh!!! The car will go.

Enjoy

Video on Balloon Powered Car

Flying hovercraft Best out of waste

Materials
1. A CD disk
2. A BIG balloon
3. A press to open and pull to close cap
4. Glue gun

How To Make It
1. Take the CD and using the glue gun stick the cap on it
2. Blow the balloon with all your might and fill it with air
3. Close the cap and put the balloon on it (you may tie a rubber band so that the balloon doesn't fly away).
4. Keep playing with it.

Enjoy
Here is a link for the video CLICK HERE

Quiz your brain

Q 1. Why does paper burn when kept on top of a candle flame whereas a paper cup containing water does not burn or catch fire?

Q 2. Why does a glass filled with water to the brim and covered by a piece of paper, cardboard or handkerchief does not spill water when overturned but a glass half filled with water empties and falls down when overturned?

Q 3.Why are load stones attached to the railway electric lines?

Q 4. Why does a bird which sits on a live wire does not get electrocuted?

Q 5. Why does the water in an earthen pot cooler than the water in a metal pot?
                                                                                                                                                          
Ans 1. When the paper cup is filled with water, the water absorbs the heat from the candle flame and does not give paper the optimum temperature to burn or catch fire.

Ans 2. The pressure on both sides are equal.

Ans 3. When heat is given to a metal it expands and when the metal is cooled it contracts. Similarly during summers due to the heat of the sun the electric wires would expand and this might lead to short circuit. For the same reason load stone is attached to the wires to prevent chances of a possible short circuit.

Ans 4. The bird sitting on the wire does not get electrocuted because the circuit is not complete.

Ans 5. There are very small pores in the walls of the earthen pot and water fills these pores and absorb heat from the water inside the pot to evaporate. This does not happen in the metal pots because there are no pores.