--- title: Colours of fire: fireworks — a lesson of Mova's school · trees and pragmatics description: «Colours of fire: fireworks», a lesson of the chemistry course of Mova's primary school, sentence by sentence with dependency trees and pragmatics. It begins: Each colour comes from a different metal packed into the firework, the way each paint in a box has its own colour. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Chemistry](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/) / Colours of fire: fireworks # Colours of fire: fireworks Lesson 26 of the chemistry course of Mova's primary school: 17 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/chemistry/26-colours-of-fire-fireworks/). - [1](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/1/) — Each colour comes from a different metal packed into the firework, the way each paint in a box has its own colour. - [2](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/2/) — When a metal's atoms get very hot they take in extra energy, and then give it back as light. - [3](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/3/) — Every kind of metal gives back its own colour: strontium red, barium green, sodium yellow, copper blue. - [4](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/4/) — You can see the same thing at home when a grown-up sprinkles a pinch of salt into a gas flame: it flashes bright yellow, because salt has sodium in it. - [5](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/5/) — Not all light needs fire. - [6](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/6/) — A glow stick, a firefly and the northern lights all glow without burning, because energy is given out as light in other ways. - [7](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/7/) — The colours of fireworks come from different metals: strontium gives red, barium green, sodium yellow and copper blue. - [8](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/8/) — Heat gives metal atoms extra energy, and each kind of metal gives it back as its own colour of light. - [9](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/9/) — Salt contains sodium, so a pinch of salt in a gas flame turns it bright yellow; old orange street lamps used sodium for the same reason. - [11](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/11/) — A firework's bang comes from powder burning so fast inside a closed case that the hot gas bursts it. - [12](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/12/) — Gunpowder was discovered in China more than a thousand years ago, and it was used for celebrations long before it was used in guns. - [14](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/14/) — Some party candles have metal salts in the wick, so their flames burn green, red or lilac. - [15](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/15/) — The northern lights are made when particles from the Sun hit gases high in our air: oxygen glows green and red, nitrogen blue and purple. - [16](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/16/) — Bending a glow stick breaks a thin glass tube inside, two chemicals mix, and their reaction gives out light with almost no heat. - [17](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/17/) — A glow stick in the freezer glows more dimly but lasts longer, because cold slows the reaction down. - [18](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/18/) — Fireflies make light with a chemical reaction in their bodies, like a glow stick's; some deep-sea fish make light the same way. - [19](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/26-colours-of-fire-fireworks/19/) — Fireworks and sparklers cause serious burns every year; fireworks are only for trained adults, and used sparklers go into a bucket of water. - ← previous: [Cleaning chemicals and safety at home](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/25-cleaning-chemicals-safety/) - next →: [Dyes, inks and colouring](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/27-dyes-inks-colouring/) - ↑ back to [Chemistry](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/)