---
title: Rust forms when iron atoms join with oxygen and water, and a rusted… — Molecules: when atoms join up · tree and pragmatics
description: Rust forms when iron atoms join with oxygen and water, and a rusted nail weighs more than the clean nail. Who acts: Rust, iron atoms, rusted nail. A sentence of the lesson «Molecules: when atoms join up» of the chemistry course of Mova's primary school with its dependency tree and the pragmatics of 
---

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# Molecules: when atoms join up, sentence 20

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Rust forms when iron atoms join with oxygen and water, and a rusted nail weighs more than the clean nail.

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**Who acts:** Rust, iron atoms, rusted nail · **What happens:** form, join, rust, weigh · **To what, where:** more

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This is a sentence of the lesson «Molecules: when atoms join up» of the chemistry course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (Rust, iron atoms, rusted nail), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:chemistry:003-molecules-when-atoms-join-up.lesson:20
# text = Rust forms when iron atoms join with oxygen and water, and a rusted nail weighs more than the clean nail.
# source = school lesson (ours)
# course = chemistry
# lesson = 003-molecules-when-atoms-join-up.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×2, R7-rel-agree ×1
1	Rust	rust	NOUN	NN	Number=Sing	2	nsubj	_	_
2	forms	form	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
3	when	when	SCONJ	WRB	_	6	mark	_	_
4	iron	iron	NOUN	NN	_	5	compound	_	_
5	atoms	atom	NOUN	NNS	Number=Plur	6	nsubj	_	_
6	join	join	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	2	advcl	_	_
7	with	with	ADP	IN	_	8	case	_	_
8	oxygen	oxygen	NOUN	NN	Number=Sing	6	obl	_	_
9	and	and	CCONJ	CC	_	10	cc	_	_
10	water	water	NOUN	NN	Number=Sing	8	conj	_	_
11	,	,	PUNCT	,	_	16	punct	_	_
12	and	and	CCONJ	CC	_	16	cc	_	_
13	a	a	DET	DT	Definite=Ind|PronType=Art	15	det	_	Agree=R5-strong|Haiku=16:det
14	rusted	rust	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	15	amod	_	Agree=R5-strong|Haiku=16:amod
15	nail	nail	NOUN	NN	Number=Sing	16	nsubj	_	Agree=R7-rel-agree|Haiku=16:compound
16	weighs	weigh	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	conj	_	_
17	more	more	ADJ	JJR	Degree=Cmp	16	obj	_	_
18	than	than	ADP	IN	_	21	case	_	_
19	the	the	DET	DT	Definite=Def|PronType=Art	21	det	_	_
20	clean	clean	ADJ	JJ	Degree=Pos	21	amod	_	_
21	nail	nail	NOUN	NN	Number=Sing	17	obl	_	_
22	.	.	PUNCT	.	_	2	punct	_	_
```

## Pragmatics {#pragmatics}

<!-- .note -->
No stored speech act for this sentence.

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **form** | present | Rust |  |  |  |  |  | vn appear-48.1.1 «NP V»: agent=Theme |
| 2 | **join** | present | iron atoms |  |  |  |  | with oxygen and water | vn mix-22.1-2-1 «NP V PP.patient»: agent=Patient with oxygen=Co-Patient |
| 3 | **rust** | participle |  |  |  |  |  |  | vn entity\_specific\_cos-45.5 «NP.patient V»: agent=Patient |
| 4 | **weigh** | present | a rusted nail | more |  |  |  |  | vn register-54.1-2-1 «NP V NP.value»: agent=Theme more=Value |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:chemistry:003-molecules-when-atoms-join-up.lesson:20`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R5-strong ×2, R7-rel-agree ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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