Ice cream has ice crystals in it. That is what’s frozen. Things exist in different phases, solid, liquid, or gas, depending on their temperature. What you know as ice cream is simply the solid phase. When the ice crystals melt, the ice cream turns liquidy!

Understanding static electricity

Static electricity is caused by the flow of electrons. When you walk across a carpet, your feet shuffle and pick up extra electrons from the carpet. Your body now contains extra electrons. When you touch a metal door knob, all these extra electrons from the carpet shoot from your body into the metal in the form of a spark.

Does a ant have a skeleton?

Ants have an exoskeleton. This means their “skeleton” is on the outside of their bodies. But their “skeleton” doesn’t look like a human skeleton. An ant’s exoskeleton is like armour. It completely covers the outside of the ant and protects its soft insides.

Why do people put fruit in paper bags?

It helps to ripen them. Fruit gives off ethylene gas, which is involved in ripening. Putting the fruit in a bag keeps the ethylene a little bit closer to the fruit than leaving it out in the open.

How do fruits and vegetables like potatoes and lemons produce electricity?

Inside a lemon, for instance, are various molecules and an acid. When mixed together, they serve as an electrolyte. An electrolyte is a substance which has ions. A simple elecrolyte is salt dissolved in water. The salt breaks into sodium and chloride ions. The lemon has ions inside it.

When you insert the electrodes into the lemon, electrons travel from one electrode to the other through the lemon. The chemical reaction between the electrodes causes a weak electric current. The lemon only makes the transfer of electrons easier. Lemons are not the only food that does this!! You can find directions on how to make a potato battery at: http://van.hep.uiuc. edu/van/a/section/ Electricity_and_Magnets/Circuits/906652432.

Do plants need water to live even if we give them fertiliser every days (do they need water even after we give them food)?

Plants make their own food, so really you don’t need to give them fertiliser. However, they do need water in order to make this food, and for transport of nutrients from the root system to other parts of the plant.