---
title: It is given that an iron nail is exposed to water and air for severa… — Molecules: when atoms join up · tree and pragmatics
description: It is given that an iron nail is exposed to water and air for several weeks. Ascertain the effect upon its mass. Exam question 4 of lesson 3 «Molecules: when atoms join up» of the chemistry course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; M
---

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# Exam question 4 · Molecules: when atoms join up

<!-- .ven lang=en -->
It is given that an iron nail is exposed to water and air for several weeks. Ascertain the effect upon its mass.

<!-- .vintro -->
**Mova's choice:** option 1 · **The right answer:** option 3 · wrong ✗ · **Who acts:** you · **What happens:** give, expose, ascertain · **To what, where:** It, iron nail, water, effect

<!-- .vabout -->
This is exam question 4 of lesson 3 «Molecules: when atoms join up» 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/3-molecules-when-atoms-join-up/#e4).

## The question {#question}

<!-- .note -->
*Sentence 1:* It is given that an iron nail is exposed to water and air for several weeks.

```conllu
# sent_id = question:chemistry:3-molecules-when-atoms-join-up:e4:1
# text = It is given that an iron nail is exposed to water and air for several weeks.
1	It	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	3	nsubj:pass	_	_
2	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	aux:pass	_	_
3	given	give	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
4	that	that	SCONJ	IN	_	9	mark	_	_
5	an	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
6	iron	iron	NOUN	NN	Number=Sing	7	compound	_	_
7	nail	nail	NOUN	NN	Number=Sing	9	nsubj:pass	_	_
8	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	aux:pass	_	_
9	exposed	expose	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	advcl	_	_
10	to	to	ADP	IN	_	11	case	_	_
11	water	water	NOUN	NN	Number=Sing	9	obl	_	_
12	and	and	CCONJ	CC	_	13	cc	_	_
13	air	air	NOUN	NN	Number=Sing	11	conj	_	_
14	for	for	ADP	IN	_	16	case	_	_
15	several	several	ADJ	JJ	Degree=Pos	16	amod	_	_
16	weeks	week	NOUN	NNS	Number=Plur	9	obl	_	SpaceAfter=No
17	.	.	PUNCT	.	_	3	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **give** | present · passive |  | It |  |  |  |  | vn give-13.1-1 «NP V NP»: subject=Theme |
| 2 | **expose** | present · passive |  | a iron nail | water and air |  | week |  | vn reflexive\_appearance-48.1.2 «NP V NP PP.recipient»: subject=Theme to water=Recipient |

<!-- .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.

<!-- .note -->
*Sentence 2:* Ascertain the effect upon its mass.

```conllu
# sent_id = question:chemistry:3-molecules-when-atoms-join-up:e4:2
# text = Ascertain the effect upon its mass.
1	Ascertain	ascertain	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	effect	effect	NOUN	NN	Number=Sing	1	obj	_	_
4	upon	upon	ADP	IN	_	6	case	_	_
5	its	its	PRON	PRP$	Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs	6	nmod:poss	_	_
6	mass	mass	NOUN	NN	Number=Sing	3	nmod	_	SpaceAfter=No
7	.	.	PUNCT	.	_	1	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **ascertain** | imperative | you *not said here* | the effect |  |  |  | upon effect's mass | vn discover-84 «NP V NP»: agent=Agent effect=Topic |

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
The mass decreases to nothing

```conllu
# sent_id = question:chemistry:3-molecules-when-atoms-join-up:e4:o1:1
# text = The mass decreases to nothing
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	mass	mass	ADJ	JJ	Degree=Pos	3	amod	_	_
3	decreases	decrease	NOUN	NNS	Number=Plur	0	root	_	_
4	to	to	ADP	IN	_	5	case	_	_
5	nothing	nothing	PRON	NN	Number=Sing|PronType=Neg	3	nmod	_	_
```

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

### Option 2 {#o2}

<!-- .ven lang=en -->
The mass decreases, iron having been destroyed

```conllu
# sent_id = question:chemistry:3-molecules-when-atoms-join-up:e4:o2:1
# text = The mass decreases, iron having been destroyed
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	mass	mass	ADJ	JJ	Degree=Pos	3	amod	_	_
3	decreases	decrease	NOUN	NNS	Number=Plur	0	root	_	SpaceAfter=No
4	,	,	PUNCT	,	_	5	punct	_	_
5	iron	iron	NOUN	NN	Number=Sing	3	appos	_	_
6	having	have	VERB	VBG	VerbForm=Ger	5	acl	_	_
7	been	be	AUX	VBN	Tense=Past|VerbForm=Part	8	aux:pass	_	_
8	destroyed	destroy	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	6	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **have** | gerund | iron *not said here* |  |  |  |  |  | tree rules |
| 2 | **destroy** | participle · passive | iron *not said here* |  |  |  |  |  | vn destroy-44 «NP V NP» |

### Option 3 · ✓ the right answer {#o3}

<!-- .ven lang=en -->
The mass increases, oxygen having combined with the iron

```conllu
# sent_id = question:chemistry:3-molecules-when-atoms-join-up:e4:o3:1
# text = The mass increases, oxygen having combined with the iron
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	mass	mass	ADJ	JJ	Degree=Pos	3	amod	_	_
3	increases	increase	NOUN	NNS	Number=Plur	7	nsubj:pass	_	SpaceAfter=No
4	,	,	PUNCT	,	_	5	punct	_	_
5	oxygen	oxygen	NOUN	NN	Number=Sing	7	nsubj:pass	_	_
6	having	have	AUX	VBG	Tense=Pres|VerbForm=Part	7	aux	_	_
7	combined	combine	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
8	with	with	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	iron	iron	NOUN	NN	Number=Sing	7	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **combine** | gerund · perfect · passive |  | the mass increases |  |  |  | with the iron | vn mix-22.1-1-1 «NP V NP PP.co-patient»: subject=Patient with iron=Co-Patient |

### Option 4 {#o4}

<!-- .ven lang=en -->
The mass remains wholly unaltered

```conllu
# sent_id = question:chemistry:3-molecules-when-atoms-join-up:e4:o4:1
# text = The mass remains wholly unaltered
1	The	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
2	mass	mass	ADJ	JJ	Degree=Pos	3	amod	_	_
3	remains	remains	NOUN	NNS	Number=Ptan	0	root	_	_
4	wholly	wholly	ADV	RB	_	5	advmod	_	_
5	unaltered	unaltered	ADJ	JJ	Degree=Pos	3	amod	_	_
```

<!-- .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.

<!-- /div -->

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- ← previous: [Molecules: when atoms join up, exam 3](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/e3/)
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- ↑ back to [Molecules: when atoms join up](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/3-molecules-when-atoms-join-up/)