Our houses contain many things that can serve as equipment for conducting exciting science experiments for our children. Well, maybe not just for kids. Some discoveries of the ‘why had I never noticed this before? ” variety won’t pass by without interest from grown-ups, as well!
We offer a selection of 5 incredible experiments that will entertain your friends and children.
What you need: salt, water, a glass of vegetable oil, food coloring, a large transparent glass or jar.
Experiment: Fill the large glass with 2/3 of water. Pour the vegetable oil into the water. The oil will float to the surface. Add food coloring. Finally, slowly pour a teaspoon of salt into the glass.
How it works: Since oil is lighter than water, it floats on the surface of the water. When salt is added to the cup, the grains of salt drag the oil to the bottom. Then, once the salt grains dissolve, the oil particles are free again to rise to the surface. The food coloring helps make the experience visually exciting.
What you will need: A container full of water (such as a bathtub or sink), a flashlight, a mirror, and a sheet of white paper.
Experiment: Fill the container with water and place the mirror in the bottom of the container. Aim the flashlight beam at the mirror. Make sure it is reflected from the mirror surface onto the sheet of paper. If done correctly, a rainbow should appear on the paper.
How it works: when passing through water, a ray of light is divided into its component colors. As a result, a rainbow appears.
What you need: a tray, a small plastic bottle, sand, food coloring, baking soda, vinegar.
Experiment: Use clay and sand tto mould a volcano shape around the small plastic bottle, to add atmosphere to the experiment. To make it erupt, put two tablespoons of baking soda in the bottle and add a quarter cup of warm water. Put on some food coloring. Finally, add a quarter cup of vinegar.
How it works: When the soda comes into contact with the vinegar, a violent reaction occurs, causing the emission of water, salt and carbon dioxide (being the CO2 bubbles the force that drives the contents of the ” volcano ” upwards ).
What you need: salt, water, a piece of wire.
Experiment: To grow crystals, you need to prepare a supersaturated salt solution. The concentration of salt should be such that if you add more, it will not dissolve.
Make sure the solution stays warm. To make the process smoother, it is better to use distilled water. When the solution is ready, pour it into a new container to remove the traces of dirt that are always present in the salt.
Now you can take a piece of wire, make a small loop at one end, and place it in the solution. Put the container in a warm place, so that the liquid does not get cold immediately.
After a few days, beautiful salt crystals should grow on the wire. If you get the hang of it, you can grow very large crystals and even make pattern crafts by twisting the thread in various ways.
How it works: As the water cools, the solubility of the salt decreases. This leads to precipitation, with the formation of salt crystals on the walls of the container and on the wire.
What you will need: a bottle, a coin large enough to cover the mouth of the bottle, water.
Experiment: Place the empty bottle without a cap in the freezer. Keep it like that for a few minutes. Take the coin and dip it in the water.
Take the bottle out of the freezer and place the coin on top of the bottle, so that it covers the mouth of the bottle. After a few seconds, the coin should start to jump over the edge of the bottle, accompanied by curious clicks.
How it works: Hot air takes up more space than cold air. When you take the bottle out of the freezer, the air inside it begins to heat up and expand. It drips out of the mouth of the bottle, causing the coin to “dance.”