---
title: "H2O" means two hydrogen atoms joined to one oxygen atom: that is on… — Molecules: when atoms join up · tree and pragmatics
description: "H2O" means two hydrogen atoms joined to one oxygen atom: that is one molecule of water. Who acts: H2O, that. 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 every clause.
---

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# Molecules: when atoms join up, sentence 1

<!-- .ven lang=en -->
"H2O" means two hydrogen atoms joined to one oxygen atom: that is one molecule of water.

<!-- .vintro -->
**Who acts:** H2O, that · **What happens:** mean, join, be · **To what, where:** two hydrogen atoms, one molecule

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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 (H2O, that), 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:1
# text = "H2O" means two hydrogen atoms joined to one oxygen atom: that is one molecule of water.
# 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): no change
1	"	"	PUNCT	``	_	2	punct	_	_
2	H2O	H2O	PROPN	NNP	Number=Sing	4	nsubj	_	_
3	"	"	PUNCT	''	_	2	punct	_	_
4	means	mean	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	two	two	NUM	CD	NumForm=Word|NumType=Card	7	nummod	_	_
6	hydrogen	hydrogen	NOUN	NN	Number=Sing	7	compound	_	_
7	atoms	atom	NOUN	NNS	Number=Plur	4	obj	_	_
8	joined	join	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	7	acl	_	_
9	to	to	ADP	IN	_	12	case	_	_
10	one	one	NUM	CD	NumForm=Word|NumType=Card	12	nummod	_	_
11	oxygen	oxygen	NOUN	NN	Number=Sing	12	compound	_	_
12	atom	atom	NOUN	NN	Number=Sing	8	obl	_	_
13	:	:	PUNCT	:	_	17	punct	_	_
14	that	that	PRON	DT	Number=Sing|PronType=Dem	17	nsubj	_	_
15	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	17	cop	_	_
16	one	one	NUM	CD	NumForm=Word|NumType=Card	17	nummod	_	_
17	molecule	molecule	NOUN	NN	Number=Sing	4	conj	_	_
18	of	of	ADP	IN	_	19	case	_	_
19	water	water	NOUN	NN	Number=Sing	17	nmod	_	_
20	.	.	PUNCT	.	_	4	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 | **mean** | present | H2O | two hydrogen atoms |  |  |  |  | vn intend-61.2-1 «NP V NP»: agent=Agent atom=Topic |
| 2 | **join** | participle |  | two hydrogen atoms *not said here* |  |  |  | to one oxygen atom | vn mix-22.1-2-1 «NP V PP.patient»: agent=Patient to atom=Co-Patient |
| 3 | **is a** | present | that | one molecule |  |  |  | of water | tree rules |

<!-- .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:1`.

**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): no change. **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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