What you need to do your own underwater vulcanoe is (maybe not as good looking as the real Hawaiian below):
- A large container
- A glass / small vase / beaker, preferably with a small neck or collar for easier attachment of threads
- Yarn / string or steel wire
- Food Colour
Tie the cord / steel wire into the collar of the small container. In the large container you pour cold water. In the glass / vase / beaker you pour as hot water as you can (think of the risk of explosion with boiling water in glass!) And color the warm water with the food colour. Immerse the small beaker in the large container and see what happens!
The hot water is lighter than the cold water, and therefore wants up to the surface to lie there. It flows out of the smaller beaker to reach the top of the large container.
Now that the weather is getting a little warmer, it can be fun to experiment a bit with water. In this case, build a rocket.
What you need is:
- Film jar (or similar jar with snap cap)
- Baking soda
Pour 1 teaspoon baking powder into the film jar. Fill up to about half the jar with water.
Quickly snap on the lid, shake once, set it upside down and take a step back.
Baking powder consists of about 30% bicarbonate, 40% some acid (eg sodium pyrophosphate) and 30% moisture resistant substance (eg corn starch). The baking powder reacts with itself when it comes into contact with water – bicarbonate and acid react to form a salt (which depends on the acid) as well as carbon dioxide.
The carbon dioxide is in gaseous form, which means it takes up a lot of space. The more carbon dioxide that is formed, the more pressure inside the film can increase (this high pressure is due to the fact that the carbon dioxide molecules are forced on a small volume while they collide a lot with each other and the film can walls). When the pressure becomes sufficiently large, the carbon dioxide molecules shoot out of the film can, while the lid flies off and the film can lift.
To make this study an experiment, try answering one of the following
issues. Don’t forget to make a hypothesis and explain the result.
Will the rocket become more powerful if you use hot water?
Will the rocket become more powerful if you use more water?
Will the rocket become more powerful if you use more baking powder?
Will the rocket become more powerful if you use a larger jar with a lid, as well as more water and baking powder?
- It is possible to make a launch pad by attaching an empty towel roll to a rigid paper, and then placing the film can in the towel roll.
- It is also possible to mix baking powder and water in a tightly sealed bag and see how the bag expands (and possibly cracks).
- Instead of baking powder, you can use some type of effervescent tablet, e.g. Samarin or a vitamin C tablet. These also usually contain bicarbonate and some acid.
- Even more powerful is the reaction if you pour vinegar into water instead of water.
Thank you to the Experiment Café in Sigtuna for this experiment.
A bit of fun with air, balloons and cotton balls.
- Balloon Sneak
Place a balloon at one end of the room and sneak up against it. 0m the balloon moves out of the air in the room, you must back until the balloon is still standing, before you can start sneaking on it again. Anyone who reaches the balloon may place it in a new place, so you sneak on!
- Where does the air go when you blow?
Blowing on a spout of paper or cotton shows how the air gets a direction when pressed out of the mouth through the lips. It is possible to control the direction if you train a little, by blowing from different directions and by moving the hole between the lips. It is also possible to control how far between should come by blowing different hard. Just try it out! To further develop the blowing, you can use straws of various kinds, thin and thick, those that can be angled and those that are straight and the nice squeaky straws can not be forgotten!
For the more competitive, there are many variants to try. For starters, you can have each to blow and blow one blow each and see who comes closest to the center! A further development of this is to see how many blows each person needs to reach the midpoint. Then you should have decided from the beginning what is the matter, is it a matter of coping with as few blows as possible, or is it about blowing as gently as you can, and thereby getting many blows? Of course, you can also compete by blowing towards the other’s tussle to prevent it from reaching the nest. Admittedly, it becomes more blow hockey than curling, but it’s also fun! If you want to play blow hockey, the thick straws that are led and can bend like a hockey club are usually best. Small targets can be made by placing two stones at a certain distance from each other.
Pour hot water into a glass jar. Close the lid and place a plate on the lid on which you put snow or ice.
See how the water forms clouds and how the cloud slowly flows down like rain.
Think with the kids how it works.
Where do the clouds come from? Where does the rain come from? Why is it raining down? And on…
I like challenges. Do you dare to try this I found from Buggy and Buddy?
The challenge is to create a container that will protect an egg from cracking or breaking from a high fall. You can make this as simple or complex as you want depending on the amount of time you have and the ages of kids you are working with.
Materials for the Egg Drop Challenge
- You can use anything you want!
- Come up with an idea of some type of container you can make to protect an egg from a high fall.
- Build your container and place the egg inside.
- Drop the egg from someplace high. (Be sure it’s safe and an adult is with you.)
- After you drop it look and see if your egg cracked or remained intact.
Questions to Spark More Curiosity & Critical Thinking
Describe your design.
- Why do you think it will protect the egg?
- Did it work? Why or why not?
- How could you improve your design?
Want to go even further?
- Try dropping the egg from increasing heights. Does it eventually stop working?
- If your initial design did not work, redesign it and try to improve it. Can you get it work the next time?
- Fill a box with a large amount of materials that could be used for this project. Then allow each child to only choose 3 items from the box to build their design.
Take a quarter of water and three quarters of oil in a bottle.
If you wish, you can also drop food color so that the water is colored.
Then drop a fizzy tablet of some kind, it pulls the water with it through the oil.
Cygnaeu’s daycare and preschool are part of an Erasmus+ project under the name ”The Competent Learning Process” where science has been a part of the theme. If you want to see the ideas they have been working on, or one of the other seven countries’ contributions, you can find it on the Science and Maths page.
Prepare as many patches as students. Choose animals that the students know and write one animal on each note (you can of course also have a picture).
Each pupil is then given a clothespin and a patch with an animal on. The patch should not be displayed to anyone else. Everyone attaches a patch to the neck of someone else in the group so everyone has a patch in the neck, but no one knows what patch you have yourself.
Have students mingle around. When two people meet, they must ask a yes / no question to each other. The purpose of the question is to find out which animal you have in the neck, for example: “Does my animal have wings?” After asking your question you have to guess what animal you have in the neck.
If you make a mistake, you may continue to mingle and ask a new question to someone else. Once you’ve figured out what animal you have, you’re done. But you can still mingle, and answer questions from those who have not yet figured out their animal.
This game arose from a forest visit. One of the children found a branch on the ground that turned out to be blue inside. Then one of the children came on: “Yes! We play find the fault-game! ”
The game involves finding things that are ”wrong” and documenting them with a camera.
Then take the pictures home and reflect on the ”errors”. See what it raises for questions.
Thanks to lektionsbanken.se for the tip!