---
title: Fizzy drinks, Mentos and cola — how Mova does on the tests · Chemistry
description: Lesson 19 of the chemistry course of Mova's primary school: 5 of 11 tests right, exam 2 of 4, every question with the options, the student's choice, the right answer and why it chose.
---

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# Fizzy drinks, Mentos and cola

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**Tests:** 5 of 11 right · **Exam:** 2 of 4 right · **Kind:** ★ · **Understood:** 7 of 15 · **Run:** 2026-10-18, commit `f3c23ea72`

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Lesson 19 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](https://md.mova.elamur.ai/free/en/corpora/school/chemistry/19-fizzy-drinks-mentos-and-cola/).

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Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: [the lesson's questions in the corpora](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/).

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### Test 1 · ★ · right ✓ {#t1}

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Ben shook his lemonade for a laugh and then opened it at his sister. What happened and why?

- **1.** Nothing, shaking makes it go flat — no support
- **2.** It got sweeter, because shaking adds sugar — no support
- **3.** It froze, because shaking cools it — no support
- **4.** It sprayed, because shaking made many bubbles — **← Mova's choice** · **✓ the right answer** · score 5

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 5, the only option with support. Its support: lesson 19, line 6: «Shaking a bottle makes many tiny bubbles that grow quickly when it is opened, so it sprays.», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+3); the same thing acted on «many tiny bubbles» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t1/)

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### Test 2 · ★ · wrong ✗ {#t2}

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"mentos + coke is a massive chemical reaction innit". What's true?

- **1.** No, it's a magnet effect — **← Mova's choice** · no support
- **2.** Yes, the mint and coke make a brand-new gas — no support
- **3.** It's mostly physics: bubbles forming very fast — **✓ the right answer** · no support
- **4.** Yes, the mint is a strong acid — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t2/)

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### Test 3 · ★ · wrong ✗ {#t3}

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Dad squeezes the half-empty bottle before closing it "to keep the fizz". Does it work?

- **1.** Yes, but only overnight — **← Mova's choice** · no support
- **2.** Yes, it keeps every bit of the fizz in — no support
- **3.** No, it makes the bottle explode open — no support
- **4.** No, the gas still fills the space — **✓ the right answer** · no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t3/)

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### Test 4 · ★ · right ✓ {#t4}

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It's 35 °C and a pack of cans sits in the car all afternoon. What could happen?

- **1.** Nothing, cans can't burst — score -4
- **2.** They would freeze from the heat — no support
- **3.** They would go flat but stay closed — no support
- **4.** Some cans could burst — **← Mova's choice** · **✓ the right answer** · score 2

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**Why:** It took the question to ask what happens next. It chose option 4 with score 2, against -4 for the next best. Its support: lesson 19, line 4: «Warm drinks hold less gas, so a can left in a hot car can burst. And a can of ordinary cola hides about seven teaspoons of sugar: the acid and fizz cover up th…», reached through what followed the sentence the question matched. What matched: the same action «burst» (+4). Against it: a different doer (counts against) (-2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t4/)

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### Test 5 · ★ · wrong ✗ {#t5}

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In a cartoon, a character drinks cola and floats up like a balloon from the bubbles. What really happens to the gas?

- **1.** It fills you up and you float — **← Mova's choice** · no support
- **2.** It turns into oxygen in your blood — no support
- **3.** It goes straight to your feet — no support
- **4.** Most of it comes back up as a burp — **✓ the right answer** · no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t5/)

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### Test 6 · ★ · right ✓ {#t6}

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Ruby: "this cola isn't even sweet, it can't have much sugar". What's true?

- **1.** The bubbles are the sugar — no support
- **2.** She's right, cola has barely any sugar in it at all — no support
- **3.** Cola uses salt instead of sugar — score 1
- **4.** It has about seven teaspoons, hidden by acid and fizz — **← Mova's choice** · **✓ the right answer** · score 3

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 3, against 1 for the next best. Its support: lesson 19, line 4: «Warm drinks hold less gas, so a can left in a hot car can burst. And a can of ordinary cola hides about seven teaspoons of sugar: the acid and fizz cover up th…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «seven teaspoons» (+2); the same action «hide» (+1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t6/)

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### Test 7 · ★ · right ✓ {#t7}

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If you poured lemonade into a perfectly smooth, spotless glass, what might you notice?

- **1.** Fewer streams of bubbles — **← Mova's choice** · **✓ the right answer** · no support
- **2.** No change at all — no support
- **3.** Twice as many bubbles — no support
- **4.** The lemonade goes bright green — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t7/)

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### Test 8 · ★ · right ✓ {#t8}

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"why do the raisins keep going up and down?? r they alive"

- **1.** Yes, raisins are tiny animals that can swim — no support
- **2.** Bubbles lift them and pop off at the top — **← Mova's choice** · **✓ the right answer** · score 3
- **3.** The lemonade is boiling them — no support
- **4.** Magnets in the glass pull them — no support

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**Why:** It took the question to ask which statement is true. It chose option 2 with score 3, the only option with support. Its support: lesson 19, line 11: «Raisins in lemonade rise when bubbles stick to them like floats and sink again when the bubbles pop at the top.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «bubbles» (+2); the same place «top» (+2). Against it: a different action (counts against) (-1). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t8/)

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### Test 9 · ★ · wrong ✗ {#t9}

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Someone says fizzy spring water must have been fizzed in a factory. What's true?

- **1.** Spring water can never hold gas — **← Mova's choice** · score 3
- **2.** Some springs are fizzy naturally from gas underground — **✓ the right answer** · no support
- **3.** The fizz comes from fish in the spring — no support
- **4.** All fizzy water comes from machines in a big factory — score 2

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**Why:** It took the question to ask which statement is true. It chose option 1 with score 3, against 2 for the next best. Its support: lesson 4, line 16: «Fizzy water has carbon dioxide gas dissolved in it under pressure; the gas escapes as bubbles, and warm drinks lose it faster; the bubbles rise because gas is…», reached through the option's own match among the sentences about the question's things. What matched: the same thing acted on «dioxide gas» (+2); the same doer «fizzy water» (+1). The right option, 2, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t9/)

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### Test 10 · ★ · wrong ✗ {#t10}

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Uncle Pete is about to pop a sparkling-wine cork aimed at Grandma. What should someone say?

- **1.** Shake it first so it's gentler — **← Mova's choice** · no support
- **2.** Point it away, corks can hurt eyes — **✓ the right answer** · no support
- **3.** Aim it at the ceiling light instead — no support
- **4.** It's fine, corks are soft — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t10/)

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### Test 11 · ★ · wrong ✗ {#t11}

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A friend wants to do the Mentos fountain in the kitchen, alone. What's the safe way?

- **1.** In the bath with the bathroom door shut tight — **← Mova's choice** · no support
- **2.** In the kitchen with the windows open — no support
- **3.** Outside, with an adult, standing well back — **✓ the right answer** · no support
- **4.** In the bedroom on a towel — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/t11/)

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### Exam question 1 · formal language · wrong ✗ {#e1}

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Identify the principal cause of the audible hiss upon the opening of a sealed fizzy drink.

- **1.** The container contracts as it is opened — **← Mova's choice** · no support
- **2.** The sugar reacts chemically with the atmosphere — no support
- **3.** The release of pressure permits dissolved gas to escape — **✓ the right answer** · no support
- **4.** The admission of air causes the liquid to boil — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/e1/)

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### Exam question 2 · formal language · wrong ✗ {#e2}

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It is given that confectionery with a rough surface is introduced into diet cola. Select the statement most accurately characterising the resulting fountain.

- **1.** It results principally from very rapid bubble formation upon the rough surface — **✓ the right answer** · no support
- **2.** It results from the melting of the confectionery into vapour — no support
- **3.** It results from the magnetic attraction of the sweets — no support
- **4.** It results principally from a chemical reaction producing an entirely new gas — **← Mova's choice** · score 5

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**Why:** It took the question to ask which statement is true. It chose option 4 with score 5, the only option with support. Its support: lesson 18, line 14: «Gas made in a closed container pushes on the walls until the weakest part gives, so reacting chemicals in a tightly closed bottle can burst it dangerously.», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+3); the same thing acted on «gas» (+2). The right option, 1, found no support in what it remembers. · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/e2/)

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### Exam question 3 · formal language · right ✓ {#e3}

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Ascertain the reason for which a sealed fizzy drink exposed to great heat may burst.

- **1.** Heat removes all the gas from the container instantly — no support
- **2.** Heat causes the metal to contract and crush the liquid — score 2
- **3.** Warm liquid holds less dissolved gas, and the internal pressure rises — **← Mova's choice** · **✓ the right answer** · score 5
- **4.** Heat converts the sugar of the drink into an explosive and highly unstable substance — score 3

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**Why:** It took the question to ask which statement is true. It chose option 3 with score 5, against 3 for the next best. Its support: lesson 19, line 4: «Warm drinks hold less gas, so a can left in a hot car can burst. And a can of ordinary cola hides about seven teaspoons of sugar: the acid and fizz cover up th…», reached through the same lesson line as the sentence the question matched. What matched: the same action «hold» (+3); the same thing acted on «less gas» (+2). · [the question and its options parsed, with trees and pragmatics](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/e3/)

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### Exam question 4 · formal language · right ✓ {#e4}

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Determine which of the following statements is consistent with the established facts concerning a can of ordinary cola.

- **1.** It contains approximately seven teaspoons of sugar — **← Mova's choice** · **✓ the right answer** · no support
- **2.** It contains no sugar whatsoever — no support
- **3.** It contains approximately one teaspoon of sugar — no support
- **4.** It contains sweeteners only and no sugar — no support

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**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](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/19-fizzy-drinks-mentos-and-cola/e4/)

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<!-- pn -->
- ← previous: [18. The fizz: vinegar, lemon and soda](https://md.mova.elamur.ai/free/en/school-run/chemistry/18-the-fizz-vinegar-lemon-and-soda/)
- next →: [20. Gases all around: breath and balloons](https://md.mova.elamur.ai/free/en/school-run/chemistry/20-gases-all-around-breath-and-balloons/)
- ↑ back to [Chemistry](https://md.mova.elamur.ai/free/en/school-run/chemistry/)