---
title: Identify the conditions under which an iron nail will rust most rapi… — Olympiad: everyday chemistry detective… · tree and pragmatics
description: Identify the conditions under which an iron nail will rust most rapidly. Exam question 1 of lesson 37 «Olympiad: everyday chemistry detectives ★★★» of the chemistry course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right.
---

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# Exam question 1 · Olympiad: everyday chemistry detectives ★★★

<!-- .ven lang=en -->
Identify the conditions under which an iron nail will rust most rapidly.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** you, iron nail · **What happens:** identify, rust · **To what, where:** conditions

<!-- .vabout -->
This is exam question 1 of lesson 37 «Olympiad: everyday chemistry detectives ★★★» of the chemistry course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/chemistry/37-olympiad-everyday-chemistry-detectives/#e1).

## The question {#question}

```conllu
# sent_id = question:chemistry:37-olympiad-everyday-chemistry-detectives:e1:1
# text = Identify the conditions under which an iron nail will rust most rapidly.
1	Identify	identify	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	conditions	condition	NOUN	NNS	Number=Plur	1	obj	_	_
4	under	under	ADP	IN	_	5	case	_	_
5	which	which	PRON	WDT	PronType=Rel	10	obl	_	_
6	an	a	DET	DT	Definite=Ind|PronType=Art	8	det	_	_
7	iron	iron	NOUN	NN	Number=Sing	8	compound	_	_
8	nail	nail	NOUN	NN	Number=Sing	10	nsubj	_	_
9	will	will	AUX	MD	VerbForm=Fin	10	aux	_	_
10	rust	rust	VERB	VB	VerbForm=Inf	3	acl:relcl	_	_
11	most	most	ADV	RBS	Degree=Sup	12	advmod	_	_
12	rapidly	rapidly	ADV	RB	_	10	advmod	_	SpaceAfter=No
13	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **identify** | imperative | you *not said here* | the conditions |  |  |  |  | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent condition=Theme |
| 2 | **rust** | future | a iron nail |  |  | the conditions |  | rapidly *property* | vn entity\_specific\_cos-45.5 «NP.patient V»: agent=Patient |

<!-- .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.

## The options {#options}

### Option 1 · ← Mova's choice · ✓ the right answer {#o1}

<!-- .ven lang=en -->
In salty water that is open to the air

```conllu
# sent_id = question:chemistry:37-olympiad-everyday-chemistry-detectives:e1:o1:1
# text = In salty water that is open to the air
1	In	in	ADP	IN	_	3	case	_	_
2	salty	salty	ADJ	JJ	Degree=Pos	3	amod	_	_
3	water	water	NOUN	NN	Number=Sing	0	root	_	_
4	that	that	PRON	WDT	PronType=Rel	6	nsubj	_	_
5	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	6	cop	_	_
6	open	open	ADJ	JJ	Degree=Pos	3	acl:relcl	_	_
7	to	to	ADP	IN	_	9	case	_	_
8	the	the	DET	DT	Definite=Def|PronType=Art	9	det	_	_
9	air	air	NOUN	NN	Number=Sing	6	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **is** | present | salty water |  |  |  |  | to the air; open *property* | tree rules |

### Option 2 {#o2}

<!-- .ven lang=en -->
In a sealed jar of perfectly dry air

```conllu
# sent_id = question:chemistry:37-olympiad-everyday-chemistry-detectives:e1:o2:1
# text = In a sealed jar of perfectly dry air
1	In	in	ADP	IN	_	4	case	_	_
2	a	a	DET	DT	Definite=Ind|PronType=Art	4	det	_	_
3	sealed	seal	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	amod	_	_
4	jar	jar	NOUN	NN	Number=Sing	0	root	_	_
5	of	of	ADP	IN	_	8	case	_	_
6	perfectly	perfectly	ADV	RB	_	7	advmod	_	_
7	dry	dry	ADJ	JJ	Degree=Pos	8	amod	_	_
8	air	air	NOUN	NN	Number=Sing	4	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **seal** | participle |  |  |  |  |  |  | vn tape-22.4 «NP V ADV-Middle»: agent=Patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
In boiled water beneath a layer of oil

```conllu
# sent_id = question:chemistry:37-olympiad-everyday-chemistry-detectives:e1:o3:1
# text = In boiled water beneath a layer of oil
1	In	in	ADP	IN	_	3	case	_	_
2	boiled	boil	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	amod	_	_
3	water	water	NOUN	NN	Number=Sing	0	root	_	_
4	beneath	beneath	ADP	IN	_	6	case	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	6	det	_	_
6	layer	layer	NOUN	NN	Number=Sing	3	nmod	_	_
7	of	of	ADP	IN	_	8	case	_	_
8	oil	oil	NOUN	NN	Number=Sing	6	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **boil** | participle |  |  |  |  |  |  | vn cooking-45.3 «NP.patient V»: agent=Patient |

### Option 4 {#o4}

<!-- .ven lang=en -->
In a vacuum with no water present

```conllu
# sent_id = question:chemistry:37-olympiad-everyday-chemistry-detectives:e1:o4:1
# text = In a vacuum with no water present
1	In	in	ADP	IN	_	3	case	_	_
2	a	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
3	vacuum	vacuum	NOUN	NN	Number=Sing	0	root	_	_
4	with	with	ADP	IN	_	7	case	_	_
5	no	no	DET	DT	PronType=Neg	7	det	_	_
6	water	water	NOUN	NN	Number=Sing	7	compound	_	_
7	present	present	NOUN	NN	Number=Sing	3	nmod	_	_
```

<!-- .note -->
The frames reader finds no event or fact in this sentence.

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**Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License.

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