Substrand: "7.3 Solids, liquids and gases"
(12 periods)
This sub-strands deals with solids, liquids and gases. These are different forms of a substance (matter). These forms of substance are inter-changeable under given conditions. These changes are physical changes. Physical change makes the substance looks very different but it is the same thing. Another type of change is called chemical change. Chemical change, the substance(s) formed into a totally new substance.
7.3.2.1 use the idea of particle movement to explain the difference between the three states of matter: solids, liquids and gases 7.3.3.1 investigate and explain the changes caused by heating and cooling of solids, liquids, and gases 7.3.3.2 draw a simple particle diagram to show the change of state from one form to another
7.3.3.1 investigate and explain the changes caused by heating and cooling of solids, liquids, and gases 7.3.3.2 draw a simple particle diagram to show the change of state from one form to another 7.3.3.3 use a thermometer to measure temperature of rain water and boiling water
7.3.4.1 conduct an experiment to observe that in a physical change the properties of the materials change, but the mass remains unchanged: melting of ice cubes
7.3.5.1 perform the following activities. To see the difference between physical change and chemical change: boiling an egg, burning of wood to charcoal, keeping an unripe tomato to ripen