Children learn that solutions cannot be separated by filtering because the particles have spread out and are not in clumps that can be blocked by a sieve. Children investigate the best place to put a cup of salt solution so that the water evaporates most quickly. They choose 4 locations and measure the amount of water in each container over the course of 7 days. They transfer their results to a line graph and use this to answer the question.
Children investigate the properties of 10 different materials. They predict and then investigate whether the materials are electrical conductors, transparent, strong thermal conductors or magnetic. They record their results in a table, and then complete a Venn diagram containing 2 intersecting sets, choosing 2 properties by which to group the materials.
Children learn that when a solute dissolves in a solvent to create a solution, its particles spread out so that they can no longer be seen or retrieved by filtering. They investigate whether sand, sugar, salt, flour or iron filings will dissolve in water. They record their results in a table and then display them in a single-set Venn diagram. They consider how they could separate the mixtures and solutions.
Children investigate whether 5 different materials can be scratched by 4 different objects of increasing hardness. They use their results to place the materials in order of hardness.
Children learn about 6 different methods for separating solutions - picking out by hand, decanting, sieving, filtering, using a magnet, and evaporation. They consider 6 different mixtures / solutions and discuss the best way to separate each. They attempt to separate thyem using their chosen method. They discuss whether their method worked and why.
Children identify the materials that 4 different objects are made from and explain why they have been chosen with reference to their physical properties. Next, they describe the physical properties and uses of 6 different materials - metals, plastics, wood, fabrics, glass and leather. They cut and paste or write their own descriptions.
Children learn about the origins of Post-It Notes, wrinkle-free cotton, polar fleece and Gore-Tex. They complete an information text, showing when and by whom they were invented, their advantages and disadvantages, and common applications.
Children learn that some physical changes are readily reversible (such as freezing and melting), while some are not (such as burning, because new substances have been produced). They examine 11 different physical changes of materials. They identify whether they can be easily reversed and explain how or why.