---
title: It is given that a closed vessel contains reacting substances which… — The fizz: vinegar, lemon and soda · tree and pragmatics
description: It is given that a closed vessel contains reacting substances which produce gas. Ascertain the principal hazard. Exam question 2 of lesson 18 «The fizz: vinegar, lemon and soda» of the chemistry course of Mova's primary school, with the dependency tree and pragmatics of the question and of each opti
---

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# Exam question 2 · The fizz: vinegar, lemon and soda

<!-- .ven lang=en -->
It is given that a closed vessel contains reacting substances which produce gas. Ascertain the principal hazard.

<!-- .vintro -->
**Mova's choice:** option 3 · **The right answer:** option 4 · wrong ✗ · **Who acts:** closed vessel, substances, you · **What happens:** give, close, contain, react, produce, ascertain · **To what, where:** It, substances, gas, principal hazard

<!-- .vabout -->
This is exam question 2 of lesson 18 «The fizz: vinegar, lemon and soda» 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/18-the-fizz-vinegar-lemon-and-soda/#e2).

## The question {#question}

<!-- .note -->
*Sentence 1:* It is given that a closed vessel contains reacting substances which produce gas.

```conllu
# sent_id = question:chemistry:18-the-fizz-vinegar-lemon-and-soda:e2:1
# text = It is given that a closed vessel contains reacting substances which produce gas.
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	_	8	mark	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
6	closed	close	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	7	amod	_	_
7	vessel	vessel	NOUN	NN	Number=Sing	8	nsubj	_	_
8	contains	contain	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	3	advcl	_	_
9	reacting	react	VERB	VBG	VerbForm=Ger	8	xcomp	_	_
10	substances	substance	NOUN	NNS	Number=Plur	9	obj	_	_
11	which	which	PRON	WDT	PronType=Rel	12	nsubj	_	_
12	produce	produce	VERB	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	10	acl:relcl	_	_
13	gas	gas	NOUN	NN	Number=Sing	12	obj	_	SpaceAfter=No
14	.	.	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 | **close** | participle |  |  |  |  |  |  | vn other\_cos-45.4 «NP.patient V»: agent=Patient |
| 3 | **contain** | present | a closed vessel |  |  |  |  |  | tree rules |
| 4 | **react** | gerund | a closed vessel *not said here* | substances |  |  |  |  | tree rules |
| 5 | **produce** | present | substances | gas |  |  |  |  | vn create-26.4 «NP V NP»: agent=Agent gas=Result |

<!-- .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 principal hazard.

```conllu
# sent_id = question:chemistry:18-the-fizz-vinegar-lemon-and-soda:e2:2
# text = Ascertain the principal hazard.
1	Ascertain	ascertain	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	_	_
3	principal	principal	ADJ	JJ	Degree=Pos	4	amod	_	_
4	hazard	hazard	NOUN	NN	Number=Sing	1	obj	_	SpaceAfter=No
5	.	.	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 principal hazard |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent hazard=Topic |

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
The vessel may become strongly and permanently magnetised

```conllu
# sent_id = question:chemistry:18-the-fizz-vinegar-lemon-and-soda:e2:o1:1
# text = The vessel may become strongly and permanently magnetised
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	vessel	vessel	NOUN	NN	Number=Sing	4	nsubj	_	_
3	may	may	AUX	MD	VerbForm=Fin	4	aux	_	_
4	become	become	VERB	VB	VerbForm=Inf	0	root	_	_
5	strongly	strongly	ADV	RB	_	4	advmod	_	_
6	and	and	CCONJ	CC	_	8	cc	_	_
7	permanently	permanently	ADV	RB	_	8	advmod	_	_
8	magnetised	magnetise	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	4	conj	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **become** | may | the vessel |  |  |  |  | strongly *property* | vn become-109.1-1-1 «NP V PP.attribute»: agent=Patient |
| 2 | **magnetise** | participle | the vessel *not said here* |  |  |  |  | permanently *property* | tree rules |

### Option 2 {#o2}

<!-- .ven lang=en -->
The vessel will become permanently cold

```conllu
# sent_id = question:chemistry:18-the-fizz-vinegar-lemon-and-soda:e2:o2:1
# text = The vessel will become permanently cold
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	vessel	vessel	NOUN	NN	Number=Sing	4	nsubj	_	_
3	will	will	AUX	MD	VerbForm=Fin	4	aux	_	_
4	become	become	VERB	VB	VerbForm=Inf	0	root	_	_
5	permanently	permanently	ADV	RB	_	6	advmod	_	_
6	cold	cold	ADJ	JJ	Degree=Pos	4	xcomp	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **become** | future | the vessel |  |  |  |  | cold *property* | vn become-109.1-1-1 «NP V PP.attribute»: agent=Patient |

### Option 3 · ← Mova's choice {#o3}

<!-- .ven lang=en -->
The substances may turn into solid metal

```conllu
# sent_id = question:chemistry:18-the-fizz-vinegar-lemon-and-soda:e2:o3:1
# text = The substances may turn into solid metal
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	substances	substance	NOUN	NNS	Number=Plur	4	nsubj	_	_
3	may	may	AUX	MD	VerbForm=Fin	4	aux	_	_
4	turn	turn	VERB	VB	VerbForm=Inf	0	root	_	_
5	into	into	ADP	IN	_	7	case	_	_
6	solid	solid	ADJ	JJ	Degree=Pos	7	amod	_	_
7	metal	metal	NOUN	NN	Number=Sing	4	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **turn** | may | the substances |  |  | solid metal |  |  | vn roll-51.3.1 «NP V PP.trajectory»: agent=Theme into metal=Trajectory |

### Option 4 · ✓ the right answer {#o4}

<!-- .ven lang=en -->
The pressure may rise until the vessel bursts

```conllu
# sent_id = question:chemistry:18-the-fizz-vinegar-lemon-and-soda:e2:o4:1
# text = The pressure may rise until the vessel bursts
1	The	the	DET	DT	Definite=Def|PronType=Art	2	det	_	_
2	pressure	pressure	NOUN	NN	Number=Sing	4	nsubj	_	_
3	may	may	AUX	MD	VerbForm=Fin	4	aux	_	_
4	rise	rise	VERB	VB	VerbForm=Inf	0	root	_	_
5	until	until	SCONJ	IN	_	8	mark	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	vessel	vessel	NOUN	NN	Number=Sing	8	nsubj	_	_
8	bursts	burst	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	advcl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **rise** | may | the pressure |  |  |  |  |  | vn assuming\_position-50 «NP V»: agent=Agent |
| 2 | **burst** | present | the vessel |  |  |  |  |  | vn appear-48.1.1 «NP V»: agent=Theme |

<!-- div src -->

**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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