Fireworks get their colours from metals. A firework goes off over the lake, and the class says which metal made the colour.
Questions
Metals
How many
Colour names
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Teacher tips
A metal gives the same colour every time, in a firework or in a flame test in the lab.
Why: the heat gives the metal's electrons extra energy, and they jump out to a higher shell. When they fall back, they give out light. Each metal gives out its own colours.
Watch again (or the space bar) sends up the same firework. A wrong guess sends up the metal they guessed, next to the mystery one, so the class can compare them.
Number keys pick an answer. Enter goes to the next firework.
In free play, tap the sky or drag across it to launch. Pick two metals to get both colours in one firework. Strontium and copper together make purple.
The five metals are the flame tests at GCSE. Some exam boards call copper's flame green and some call it blue-green.
If a child in the class is colour blind, turn on Colour names. Each firework then has its colour written on it, and the question asks which metal gives that colour, the way exam questions do. Red, crimson, orange-red, yellow and green are the colours most often confused.