As well as the molecules and equations using the Chemical jigsaw kit alone, a larger variety covering the vast majority of reactions encountered in Key Stage 4 (14-16) can be made. Thus groups of students can make each of the following using the Chemical jigsaw kit and the extra pieces listed below: Again, they can use a worksheet and make and write ‘in turn’.
12 hydrogen atoms (small, white); 20 oxygen atoms (red); 8 carbon atoms (black); 2 nitrogen atoms (blue); 8 chlorine atoms (green); 2 bromine atoms (brown); 2 iodine atoms (purple); 2 flourine atoms (small, green); 1 sulfur atom (yellow); 1 phosphorus atom (pale blue); 1 silicon atom (grey).
Bonds etc. (transparent, colourless)
20 single bonds; 22 ‘double’ bonds.
Total number of pieces to upgrade = 101 [42 bonds and 59 atoms].
Chemical jigsaws offer a highly effective method of teaching chemical formulae and equations. Each jigsaw uses a number of interlocking pieces with plus signs and arrows that enable students to build representations of covalent and ionic compounds and also to model equations. Classroom trials show that using the jigsaw kits creates a number of advantages over more traditional approaches to teaching and learning:
• more effective understanding of formulae
• enhanced motivation
• use of OHP for demonstrations
Covalent and Ionic jigsaw kits are available as standalone sets for Key Stage 3 pupils (aged 11–14) with supplementary upgrade kits for Key Stage 4 pupils (aged 14–16).
The ‘Chemical Jigsaws CD–Rom’ was created to support the use of Chemistry Jigsaws kits and provides a collection of Flash animations, Word documents and PowerPoint presentations that can be used alongside the Chemistry Jigsaws kits. Offered only as a set, the ‘Chemistry Jigsaws CD–Rom’ together with the complete Chemistry Jigsaws kit (Key Stage 3 kit [JIG 004], Key Stage 4 upgrade kit [JIG 005] and Ionic Jigsaw [JIG 002]), is an invaluable classroom tool.
The Chemistry Jigsaw Book, along with its own accompanying CD–ROM, contains a series of chemistry experiments that can be performed in the kitchen using chemicals found in the home, and can be modelled using the Chemistry Jigsaw kits. Available with or without its own jigsaw kit, it helps pupils get to grips with chemical reactions and formulae.
In the covalent jigsaw, atoms are represented by coloured disks with cut–outs corresponding to the positions of atoms in the periodic table. Phosphorus, for example, has three cut–outs and requires three ‘electrons’ to fill its outer shell. Atoms are joined by clear bonds representing electrons shared between atoms. The covalent jigsaw is available in two boxed sets.