Electrons have a _____________ charge.

Elements are the simplest forms of matter.

Water is made from two different elements, these are________.

Unlike charges ____________ and like charges ______________.

Water is labelled a 'polar molecule'. Why?

_________ refers to the process by which highly concentrated molecules intermingle in another substance as a result of their kinetic energy of random motion.

When grains of sugar are added to water the sugar molecules become surrounded by the attracted water molecules so that the individual sugar molecules are no longer part of the sugar crystals. This process continues until either all the sugar (________) has dissolved in the water (_________) to form a solution, or there are no longer any unattached water molecules remaining and so no more sugar can dissolve.

When no more solute can dissolve in a solution, the solution is saturated.

Flocculation is the process where alum and other chemicals are added to the water to gather dirt particles together

into clumps.

Sedimentation is process of allowing the particles to float to the top leaving clear water below.

Filtration is the process of water passing through filters or layers of sand, gravel and charcoal to remove smaller dirt particles.

The acceptable pH level for drinking water is between _________.

Waterways that receive sewage overflows, manures or fertilisers may lead to increased nitrate levels.

In membrane filtration, water is filtered through tiny holes in the wall of the membrane. What is another name for these holes?

How have you enjoyed science this term?