---
title: Which of the following statements most accurately characterises a re… — Changes you can undo and changes you c… · tree and pragmatics
description: Which of the following statements most accurately characterises a reversible change? Exam question 1 of lesson 9 «Changes you can undo and changes you can't» 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 wa
---

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# Exam question 1 · Changes you can undo and changes you can't

<!-- .ven lang=en -->
Which of the following statements most accurately characterises a reversible change?

<!-- .vintro -->
**Mova's choice:** option 4 · **The right answer:** option 4 · right ✓ · **What happens:** follow, characteris · **To what, where:** reversible change

<!-- .vabout -->
This is exam question 1 of lesson 9 «Changes you can undo and changes you can't» 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/9-changes-you-can-and-cannot-undo/#e1).

## The question {#question}

```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:e1:1
# text = Which of the following statements most accurately characterises a reversible change?
1	Which	which	PRON	WDT	PronType=Rel	8	nsubj	_	_
2	of	of	ADP	IN	_	5	case	_	_
3	the	the	DET	DT	Definite=Def|PronType=Art	5	det	_	_
4	following	follow	VERB	VBG	VerbForm=Ger	5	amod	_	_
5	statements	statement	NOUN	NNS	Number=Plur	8	obl	_	_
6	most	most	ADV	RBS	Degree=Sup	7	advmod	_	_
7	accurately	accurately	ADV	RB	_	8	advmod	_	_
8	characterises	characteris	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
9	a	a	DET	DT	Definite=Ind|PronType=Art	11	det	_	_
10	reversible	reversible	NOUN	NN	Number=Sing	11	compound	_	_
11	change	change	NOUN	NN	Number=Sing	8	obj	_	SpaceAfter=No
12	?	?	PUNCT	.	_	8	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **follow** | gerund |  |  |  |  |  |  | vn occur-48.3-1 «NP V»: agent=Theme |
| 2 | **characteris** | present |  | a reversible change |  |  |  | of the following statements; accurately *property* | 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.

## The options {#options}

### Option 1 {#o1}

<!-- .ven lang=en -->
A change accompanied invariably by the emission of light

```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:e1:o1:1
# text = A change accompanied invariably by the emission of light
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	change	change	NOUN	NN	Number=Sing	0	root	_	_
3	accompanied	accompany	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	2	acl	_	_
4	invariably	invariably	ADV	RB	_	3	advmod	_	_
5	by	by	ADP	IN	_	7	case	_	_
6	the	the	DET	DT	Definite=Def|PronType=Art	7	det	_	_
7	emission	emission	NOUN	NN	Number=Sing	3	obl	_	_
8	of	of	ADP	IN	_	9	case	_	_
9	light	light	NOUN	NN	Number=Sing	7	nmod	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **accompany** | participle |  | a change *not said here* |  |  |  | by the emission of light; invariably *property* | vn accompany-51.7 «NP V NP PP.destination»: agent=Agent by emission=Destination |
| 2 | **emit** |  |  | light |  |  |  |  | nom emission «act transitive»: of=patient |

### Option 2 {#o2}

<!-- .ven lang=en -->
A change in which atoms are destroyed

```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:e1:o2:1
# text = A change in which atoms are destroyed
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	change	change	NOUN	NN	Number=Sing	7	nsubj	_	_
3	in	in	ADP	IN	_	5	case	_	_
4	which	which	DET	WDT	PronType=Int	5	det	_	_
5	atoms	atom	NOUN	NNS	Number=Plur	2	nmod	_	_
6	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	7	aux:pass	_	_
7	destroyed	destroy	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **destroy** | present · passive |  | a change in which atoms |  |  |  |  | vn destroy-44 «NP V NP»: subject=Patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
A change in which new substances are formed by the rearrangement of atoms within molecules

<!-- fold The tree, 15 words -->
```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:e1:o3:1
# text = A change in which new substances are formed by the rearrangement of atoms within molecules
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	change	change	NOUN	NN	Number=Sing	8	nsubj	_	_
3	in	in	ADP	IN	_	6	case	_	_
4	which	which	PRON	WDT	PronType=Rel	6	nsubj	_	_
5	new	new	ADJ	JJ	Degree=Pos	6	amod	_	_
6	substances	substance	NOUN	NNS	Number=Plur	2	nmod	_	_
7	are	be	AUX	VBP	Mood=Ind|Number=Plur|Person=3|Tense=Pres|VerbForm=Fin	8	aux:pass	_	_
8	formed	form	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
9	by	by	ADP	IN	_	11	case	_	_
10	the	the	DET	DT	Definite=Def|PronType=Art	11	det	_	_
11	rearrangement	rearrangement	NOUN	NN	Number=Sing	8	obl	_	_
12	of	of	ADP	IN	_	13	case	_	_
13	atoms	atom	NOUN	NNS	Number=Plur	11	nmod	_	_
14	within	within	ADP	IN	_	15	case	_	_
15	molecules	molecule	NOUN	NNS	Number=Plur	8	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **form** | present · passive | the rearrangement of atoms | a change in new substances |  |  |  | within molecules | vn appear-48.1.1 «PP.location V NP»: agent=Location subject=Theme |
| 2 | **rearrange** |  |  | atoms |  |  |  |  | nom rearrangement «act transitive»: of=patient |

### Option 4 · ← Mova's choice · ✓ the right answer {#o4}

<!-- .ven lang=en -->
A change in which no new substance is formed and the original may be recovered

<!-- fold The tree, 15 words -->
```conllu
# sent_id = question:chemistry:9-changes-you-can-and-cannot-undo:e1:o4:1
# text = A change in which no new substance is formed and the original may be recovered
1	A	a	DET	DT	Definite=Ind|PronType=Art	2	det	_	_
2	change	change	NOUN	NN	Number=Sing	15	nsubj	_	_
3	in	in	ADP	IN	_	4	case	_	_
4	which	which	PRON	WDT	PronType=Rel	9	obl	_	_
5	no	no	DET	DT	PronType=Neg	7	det	_	_
6	new	new	ADJ	JJ	Degree=Pos	7	amod	_	_
7	substance	substance	NOUN	NN	Number=Sing	9	nsubj	_	_
8	is	be	AUX	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	9	aux:pass	_	_
9	formed	form	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	2	acl:relcl	_	_
10	and	and	CCONJ	CC	_	12	cc	_	_
11	the	the	DET	DT	Definite=Def|PronType=Art	12	det	_	_
12	original	original	ADJ	JJ	Degree=Pos	9	conj	_	_
13	may	may	AUX	MD	VerbForm=Fin	15	aux	_	_
14	be	be	AUX	VB	VerbForm=Inf	15	aux:pass	_	_
15	recovered	recover	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	0	root	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **form** | present · passive |  | no new substance |  | a change |  |  | vn appear-48.1.1 «PP.location V NP»: subject=Theme |
| 2 | **recover** | may · passive |  | a change |  |  |  |  | vn obtain-13.5.2 «NP V NP»: subject=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.

<!-- /div -->

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- ← previous: [Changes you can undo and changes you c…, test 10](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/9-changes-you-can-and-cannot-undo/t10/)
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