Colours of fire: fireworks
Tests: 5 of 11 right · Exam: 2 of 4 right · Kind: ★ · Understood: 7 of 15 · Run: 2026-10-18, commit f3c23ea72
Lesson 26 of the chemistry course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: the lesson in the corpora.
Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.
Test 1 · ★ · right ✓
Sam's big brother says red fireworks are red because there's red paint inside. What's true?
- 1. The red comes from hot red smoke — score 6
- 2. The red comes from a metal, strontium — ← Mova's choice · ✓ the right answer · score 8
- 3. The red is the colour of the fire itself — no support
- 4. He's right, the paint glows when it burns — no support
Why: It took the question to ask which statement is true. It chose option 2 with score 8, against 6 for the next best. Its support: lesson 26, line 1: «On Bonfire Night or New Year's Eve the sky fills with red, green, gold and blue. Each colour comes from a different metal packed into the firework, the way eac…», reached through the same lesson line as the sentence the question matched. What matched: the same action «come» (+4); the same doer «colour» (+2); the same place «different metal» (+2). · the question and its options parsed, with trees and pragmatics
Test 2 · ★ · right ✓
"sparkler's just a pretty light, it's not even hot, innit". Right?
- 1. No, it burns hotter than an oven — ← Mova's choice · ✓ the right answer · no support
- 2. Yes, only the handle is hot — no support
- 3. No, but only the smoke is hot — no support
- 4. Yes, sparklers give cold light — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 3 · ★ · right ✓
If you put a glow stick in the freezer, what happens?
- 1. It turns into a hard ice lolly — no support
- 2. It stops forever and is ruined — no support
- 3. It glows dimmer but lasts longer — ← Mova's choice · ✓ the right answer · score 4
- 4. It glows brighter and lasts longer — score 4
Why: It took the question to ask what happens next. It chose option 3 with score 4, tied with another option at 4 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 26, line 15: «A glow stick in the freezer glows more dimly but lasts longer, because cold slows the reaction down.», reached through the option's own match among the sentences about the question's things. What matched: the same action «glow» (+2); the same doer «glow stick» (+2). · the question and its options parsed, with trees and pragmatics
Test 4 · ★ · right ✓
A game says fireflies glow because they swallowed tiny stars. What really happens?
- 1. They store sunlight in their wings all day — no support
- 2. Glowing bacteria live on their backs — no support
- 3. A chemical reaction in their body makes light — ← Mova's choice · ✓ the right answer · score 2
- 4. They rub their legs together to make sparks — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 2, the only option with support. Its support: lesson 26, line 16: «Fireflies make light with a chemical reaction in their bodies, like a glow stick's; some deep-sea fish make light the same way.», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «light» (+2); the same action «make» (+1). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics
Test 5 · ★ · wrong ✗
Gran: "the old street lamps were orange as anything, why tho?"
- 1. They had orange glass fitted in front of the bulb — ← Mova's choice · no support
- 2. They used sodium, which glows yellow-orange — ✓ the right answer · no support
- 3. They burned orange candles inside — no support
- 4. Orange light was cheaper to paint on — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 6 · ★ · wrong ✗
Which pair is right?
- 1. Barium gives blue, copper gives red — ← Mova's choice · no support
- 2. Copper gives yellow, sodium gives red — no support
- 3. Sodium gives green, strontium gives yellow — no support
- 4. Barium gives green, copper gives blue — ✓ the right answer · no support
Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 7 · ★ · wrong ✗
"fireworks were invented for war first, then for fun". What's true?
- 1. They were only ever used for war and nothing else — ← Mova's choice · no support
- 2. They were used for celebrations long before guns — ✓ the right answer · no support
- 3. They were first made for war in Europe — no support
- 4. They were invented in 1900 for parties — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 8 · ★ · wrong ✗
Oli: "the green in the northern lights is fire in the sky". What's really glowing?
- 1. Oxygen high up, hit by particles from the Sun — ✓ the right answer · score 4
- 2. Gas from volcanoes on fire in the sky — ← Mova's choice · score 9
- 3. Forests burning far away in the north — no support
- 4. Green moonlight bouncing off the ice — no support
Why: It took the question to ask what it is done to. It chose option 2 with score 9, against 4 for the next best. Its support: lesson 26, line 13: «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.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+5); the same thing acted on «gases» (+4). The right option, 1, scored 4. · the question and its options parsed, with trees and pragmatics
Test 9 · ★ · wrong ✗
After the display Tom wants to bin his used sparklers in the paper bag. What should he do?
- 1. Stick them in the grass and walk off — ← Mova's choice · score 4
- 2. Drop them into a bucket of water first — ✓ the right answer · no support
- 3. Throw them in the paper bag straight away — no support
- 4. Blow on them and put them in a pocket — score 3
Why: It took the question to ask what is done. It chose option 1 with score 4, against 3 for the next best. Its support: lesson 25, line 4: «Chemicals stay in their own bottles, sprays are used with a window open, and if anything splashes into an eye it is rinsed with lots of clean water straight aw…», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same action «stay» (+2). Against it: a different doer (counts against) (-1). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Test 10 · ★ · wrong ✗
If a firework had only sodium for colour, what would you see?
- 1. A bright yellow burst — ✓ the right answer · no support
- 2. No colour at all, just smoke — ← Mova's choice · score 9
- 3. A mixed green and red burst — no support
- 4. A deep, dark blue burst — no support
Why: It took the question to ask what it is done to. It chose option 2 with score 9, the only option with support. Its support: lesson 26, line 11: «Fireworks leave smoke made of tiny particles, and big displays make the air dirtier for a few hours; the bangs frighten many pets and wild animals.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+5); the same thing acted on «smoke» (+4). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics
Test 11 · ★ · right ✓
Why is the air dirtier for a few hours after a big display?
- 1. Fireworks leave smoke of tiny particles — ← Mova's choice · ✓ the right answer · no support
- 2. The bangs shake dust off buildings — no support
- 3. The lights heat the air and make fog — no support
- 4. Fireworks suck all the clean air up into the sky — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · wrong ✗
Identify the principal origin of the diverse colours observed in pyrotechnic displays.
- 1. The coloured paper enclosing the device — ← Mova's choice · no support
- 2. The colour of the smoke produced on ignition — no support
- 3. The reflection of artificial light by clouds — no support
- 4. The presence of different metals within the device — ✓ the right answer · no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Exam question 2 · formal language · right ✓
It is given that a small quantity of common salt is introduced into a gas flame. Select the observation most consistent with the established facts.
- 1. The flame becomes deep blue — score 2
- 2. The flame becomes colourless — no support
- 3. The flame is extinguished at once — no support
- 4. The flame becomes bright yellow — ← Mova's choice · ✓ the right answer · score 5
Why: It took the question to ask which statement is true. It chose option 4 with score 5, against 2 for the next best. Its support: lesson 26, line 7: «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.», reached through the same lesson line as the sentence the question matched. What matched: the same action «turn» (+4); the same property (+1). · the question and its options parsed, with trees and pragmatics
Exam question 3 · formal language · right ✓
Which of the following statements most accurately characterises the luminescence of a bent glow stick?
- 1. Two chemicals react and emit light with negligible heat — ← Mova's choice · ✓ the right answer · no support
- 2. Stored sunlight is released upon bending — no support
- 3. Combustion occurs within the sealed tube — no support
- 4. A concealed electrical cell illuminates a filament — no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Exam question 4 · formal language · wrong ✗
Ascertain the reason for which a sparkler must be held at arm's length.
- 1. It becomes intensely cold upon ignition — ← Mova's choice · no support
- 2. It may ascend into the air without warning — no support
- 3. It emits a poisonous liquid during use — no support
- 4. Its temperature exceeds one thousand degrees Celsius — ✓ the right answer · no support
Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/chemistry/26-colours-of-fire-fireworks/