Grade 9

Acid Rain

Water droplets in the atmosphere react with carbon dioxide gas to form an acid called carbonic acid. Water is normally ...
Read More
/ acidic, Atmosphere, carbonic acid, corrosive, droplets, Grade 9, Water

Characteristics of water

Water is the most common substance on the planet yet it has some very unsual characteristics. Pure water is odourless ...
Read More
/ coolant, Grade 9, Odourless, pure, Solvent, surface tension, tasteless, Water

Desalination

Changing salty water to fresh water. Called the 'blue planet' or the 'water planet' the Earth's surface is 70% covered ...
Read More
/ blue planet, demand, Desalination, Grade 9, seawater, undrinkable, Water

Hydro-Electricity

Generating electricity using water Most of South Africa’s electricity is generated by burning coal. This heats water which creates steam ...
Read More
/ coal, Electricity, falling water, Grade 9, hydro-electricity, steam

Rusting

Rusting occurs when iron reacts with oxygen in the presence of water. This is a form of corrosion that results ...
Read More
/ corrodes, electroplating, galvanising, Grade 9, iron oxide, Rusting, Water

Solar Water Heater

In most homes the geyser is the appliance that uses the most electricity.  Geysers use electricity all day to keep ...
Read More
/ convection, geyser, Grade 9, hot, panel, radiation, solar

Virtual Water

We all know how important it is to turn off the tap while we are brushing our teeth and that ...
Read More
/ Agriculture, consumption, cooking, drinking, Grade 9, production, Water

Water in the Body

We can describe the Earth as a watery planet because 70% of it’s surface is covered in water.  All living ...
Read More
/ Cells, Grade 9, organs, Survive, systems, tissues, Water

Water Molecules

Water is a compound composed of two elements, Hydrogen and Oxygen.  Each water molecule consists of two Hydrogen atoms joined ...
Read More
/ chemical, Compound, Grade 9, Hydrogen, molecule, Oxygen, Water