Celebrating Science Activities 5-6

#Science Activity 5: The Magic Ketchup!

You can make a pack of ketchup float and sink at your command while it's sealed inside a bottle!

What you will need:

  • A 1 liter plastic bottle
  • Ketchup pack
  • Salt 

  1. Remove any labels from the bottle and fill it all the way to the top with water.
  2. Add a ketchup pack to the bottle.
  3. If the ketchup floats, you're all set - go to step 4. If the ketchup sinks in the bottle, go to step 5.
  4. For the floating ketchup pack simply screw the cap on the bottle and squeeze the sides of the bottle hard. If the ketchup sinks when you squeeze it and floats when you release it, congratulations, you're ready to show it off.
  5. If the ketchup pack sinks, add about 3 tablespoons (45 ml) of salt to the bottle. Cap it and shake it up until the salt dissolves. (Kosher salt will keep the water from getting too cloudy, although it will usually clear up over time if using regular table salt.)
  6. Continue adding salt, a few tablespoons at a time until the ketchup is just barely floating to the top of the bottle.
  7. Once it is consistently floating, make sure the bottle is filled to the top with water, and then cap it tightly.
  8. Now squeeze the bottle. The magic ketchup should sink when you squeeze the bottle and float up when you release it. With some practice you can get it to stop in the middle of the bottle.

What's happening?

Density deals with the amount of mass an object has. Adding salt to the water adjusted the water's density to get the ketchup to float. There is a little bubble inside of the ketchup packet. As we know bubbles float, and the bubble in the ketchup sometimes keeps the heavy packet from sinking. When you squeeze the bottle hard enough, you put pressure on the packet. That causes the bubble to get smaller and the entire packet to become MORE DENSE than the water around it and the packet sinks. When you release the pressure, the bubble expands, making the packet less dense and, alas, it floats back up. 

#Science Activity 6: Lava in a Cup


What you will need:

·         A clear drinking glass
·         1/4 cup vegetable oil
·         1 teaspoon salt
·         Water
·         Food coloring (optional)

  1. Fill the glass about 3/4 full of water .
  2. Add about 5 drops of food coloring - I like red for the lava look.
  3. Slowly pour the vegetable oil into the glass. See how the oil floats on top - cool huh? It gets better.
  4. Now the fun part: Sprinkle the salt on top of the oil.
  5. Watch blobs of lava move up and down in your glass!
  6. If you liked that, add another teaspoon of salt to keep the effect going.

What's happening?

So what's going on? Of course, it's not real lava but it does look a bit like a lava lamp your parents may have had. First of all, the oil floats on top of the water because it is lighter than the water. Since the salt is heavier than oil, it sinks down into the water and takes some oil with it, but then the salt dissolves and back up goes the oil!

Stay tuned daily for more interesting kids activities this week! Feel free to send in your ideas and comments.

Team Avishkaar Box
+91 8506931515

Celebrating Science Activities 5-6 Celebrating Science Activities 5-6 Reviewed by Avishkaar Box on 18:45 Rating: 5

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