The properties of materials relate to their use as everyday objects such as spoons. Children test the insulating properties of various stirrers & discuss everyday uses of materials for thermal insulation or conduction. Look at diff meanings of word conductor. Suitable for Y4 pupils.
The concepts being taught using this resource are incorrect.
Chocolate melts because it has a low melting point, not because it's a poor insulator. A metal spoon is not a good insulator - it will get hot and burn your hand because it's a good conductor. It has a high melting point and that's why it's good for stirring tea. This is teaching children the wrong thing - don't use this lesson plan.
The worksheet is good, though.