a) What happens when exploding stars (pyrotechnic pellets) are arranged on a card in a certain shape inside a shell?(1 mark) b) What does the initial fuse do? c) What are wirebridge fuses used for? d) What is gunpowder also known as? e) Name the charge that sends the shell into the air without detonating the main compartment.(1 mark) f) What determines the colour and shape of the explosion? g) There are three main chemical components of a sparkler. What are they? h) How is the sparkler then made? i) Give two reasons why a powdered metal is essential. j) Which metals produce a yellow sparkle? k) What salt can be added to give a green sparkle?