---
title: Gases all around: breath and balloons — the lesson's questions with trees and pragmatics · Chemistry
description: The 15 test and exam questions of lesson 20 «Gases all around: breath and balloons» of the chemistry course of Mova's primary school, each with its options, Mova's choice and the right answer, every sentence with its dependency tree and pragmatics.
---

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# Gases all around: breath and balloons

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The 15 questions of lesson 20 «Gases all around: breath and balloons» of the chemistry course of Mova's primary school with their options, 83 sentences, every one parsed by Mova with its syntax tree and pragmatics. How the student did on them: [the lesson at school](https://md.mova.elamur.ai/free/en/school-run/chemistry/20-gases-all-around-breath-and-balloons/).

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- [t1](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t1/) — "i breathed on the window and drew a smiley in it. where'd the wet come from??" — right ✓ · ★
- [t2](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t2/) — Ellie says helium balloons go down because the helium "gets tired". What's true? — wrong ✗ · ★
- [t3](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t3/) — The party planner wants to release 100 balloons into the sky. What's the problem? — right ✓ · ★
- [t4](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t4/) — If the burner of a hot-air balloon stopped working high in the sky, what would happen? — right ✓ · ★
- [t5](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t5/) — "dad's gonna fix the car in the garage with the engine running and the door shut". What's the danger? — wrong ✗ · ★
- [t6](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t6/) — In class, Sam pumps air into lime water and nothing much happens; then he breathes into it and it goes milky. Why the difference? — right ✓ · ★
- [t7](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t7/) — "the hot spring stinks of rotten eggs, did someone drop eggs in it?" — right ✓ · ★
- [t8](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t8/) — In a cartoon, a balloon is filled with hot air and then left in a freezer, where it floats up. What would really happen? — right ✓ · ★
- [t9](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t9/) — Pondweed in a jar on the windowsill makes bubbles all day. What happens at night? — wrong ✗ · ★
- [t10](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t10/) — "tyre was fine yesterday, looks flat this morning, it's minus 5". What's the likely reason? — wrong ✗ · ★
- [t11](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/t11/) — Which balloon will still be floating after a week? — wrong ✗ · ★
- [e1](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/e1/) — Identify the substance whose presence in exhaled breath causes lime water to become milky. — wrong ✗ · exam
- [e2](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/e2/) — It is given that the air within a balloon is heated. Select the statement most accurately characterising the consequence. — right ✓ · exam
- [e3](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/e3/) — Which of the following statements most accurately characterises carbon monoxide? — right ✓ · exam
- [e4](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/20-gases-all-around-breath-and-balloons/e4/) — Ascertain the reason for which a helium balloon of rubber diminishes in size over several days. — right ✓ · exam

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