Category: Science

Reversible and Irreversible Changes

REVERSIBLE CHANGES In a previous post, ‘What’s the matter?’, we discussed the three states of matter and how matter can change from one state to another by heating and cooling it. Changes between the states of matter can also happen by mixing. Mixing Let’s take salt as an example. If we mix salt (solid) with water (liquid) we will get a…

Chemical and Physical Changes

There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn’t change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed. Does that sound complicated? Here are some examples that will hopefully…

What’s the matter? 3 States of Matter for kids

Everything around us is made of matter. Matter is made up of particles and depending on how these particles are arranged, it exists in three states: solid, liquid and gas.  In solids, the particles are very close to one another and they have a strong force of attraction between them. As a result, solids have a definite shape and volume.…

Fossil Fuels

Humans use fuels to make energy to power machines like cars, computers and ships. People get the fuel to make all this energy, mostly by digging it out of the ground and burning it. This releases ancient energy stores, what we call fossil fuels, which are made up of billions  of tiny plants and animals.  When plants and animals died,…

Our Environment

When we talk about our environment we mean everything around us that surrounds and affects all life on earth. We need the environment for our basic needs, which are: oxygen food water shelter warmth Can you think of ways we can get the above from our environment? Over the years, human population has increased. This has had a huge impact…

More about batteries…

In 1800, Alessandro Volta invented the first battery, which came to be known as the voltaic pile. The voltaic pile consisted of pairs of copper and zinc discs piled on top of each other, separated by a layer of cloth or cardboard soaked in saltwater. Gaston Plante invented the first lead-acid battery in 1859. Thomas Edison invented the first alkaline cell…

What to do during an earthquake!

More than a million earthquakes rattle the world each year! An earthquake is caused by a powerful movement of the tectonic plates, which are found below the Earth’s crust. The fast release of energy creates seismic waves that travel through the Earth. We feel that movement and call it an earthquake. It is important in earthquake prone countries, to build…

Eco batteries!

Is it possible to make a battery using a piece of fruit or a vegetable? The answer is yes! It is possible! Read on to find out how. A lemon battery is a simple battery. The source of electric energy is the combination of copper and zinc strips in the citric acid of the lemon. The citric acid of the…

Organs of the human body – An interactive game!

In Science we have been covering the human systems! Can you help the man find all his organs?  Play this interactive game and test your knowledge on the human systems!  Click on the image to play the game!  Hope you enjoyed playing this game! Did it help you with revise for your science test?  Till next time … Images and interactive game…