---
title: Molecules: when atoms join up — the lesson's questions with trees and pragmatics · Chemistry
description: The 14 test and exam questions of lesson 3 «Molecules: when atoms join up» 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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# Molecules: when atoms join up

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The 14 questions of lesson 3 «Molecules: when atoms join up» of the chemistry course of Mova's primary school with their options, 77 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/3-molecules-when-atoms-join-up/).

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- [t1](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/t1/) — Your friend says: "Water is made of two gases, so it should be a gas too." What is the answer? — right ✓ · ★
- [t2](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/t2/) — "Is the carbon in an oak tree from stuff animals breathed out ages ago?" Best answer? — right ✓ · ★
- [t3](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/t3/) — In a cartoon, a lab-made lemon flavour is called "fake poison" though its molecule is exactly the same as the fruit's. What's wrong? — right ✓ · ★
- [t4](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/t4/) — Your gran says: "Natural is always safe, artificial is always bad." Put her right. — wrong ✗ · ★
- [t5](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/t5/) — How does a two-metre DNA molecule fit inside a tiny cell? — wrong ✗ · ★
- [t6](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/t6/) — "my brother says atoms in a ball-and-stick model are really red and white balls" What is the truth? — wrong ✗ · ★
- [t7](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/t7/) — What would happen if you tried to separate iron sulphide back into iron and sulphur with a magnet? — right ✓ · ★
- [t8](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/t8/) — A struck match gives a sharp smell. Where does it come from? — wrong ✗ · ★
- [t9](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/t9/) — "rusty nail weighs more?? rubbish, rust is crumbly" Is the claim right? — wrong ✗ · ★
- [t10](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/t10/) — A sugar molecule has 45 atoms. Which atoms are they? — wrong ✗ · ★
- [e1](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/e1/) — Which of the following statements most accurately characterises a molecule? — right ✓ · exam
- [e2](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/e2/) — Identify the principal distinction between a mixture and a compound. — right ✓ · exam
- [e3](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/e3/) — Select the response that is consistent with the established facts concerning the assertion that a beverage is "chemical-free". — right ✓ · exam
- [e4](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/e4/) — It is given that an iron nail is exposed to water and air for several weeks. Ascertain the effect upon its mass. — wrong ✗ · exam

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