---
title: Red cabbage indicator turns blue-green upon the addition of a substa… — Olympiad: kitchen chemistry puzzles ★★★ · tree and pragmatics
description: Red cabbage indicator turns blue-green upon the addition of a substance. Ascertain the substance. Exam question 3 of lesson 36 «Olympiad: kitchen chemistry puzzles ★★★» of the chemistry course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova'
---

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# Exam question 3 · Olympiad: kitchen chemistry puzzles ★★★

<!-- .ven lang=en -->
Red cabbage indicator turns blue-green upon the addition of a substance. Ascertain the substance.

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**Mova's choice:** option 1 · **The right answer:** option 2 · wrong ✗ · **Who acts:** Red cabbage indicator, you · **What happens:** turn, ascertain · **To what, where:** addition, substance

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This is exam question 3 of lesson 36 «Olympiad: kitchen chemistry puzzles ★★★» 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/36-olympiad-kitchen-chemistry-puzzles/#e3).

## The question {#question}

<!-- .note -->
*Sentence 1:* Red cabbage indicator turns blue-green upon the addition of a substance.

```conllu
# sent_id = question:chemistry:36-olympiad-kitchen-chemistry-puzzles:e3:1
# text = Red cabbage indicator turns blue-green upon the addition of a substance.
1	Red	red	ADJ	JJ	Degree=Pos	3	amod	_	_
2	cabbage	cabbage	NOUN	NN	Number=Sing	3	compound	_	_
3	indicator	indicator	NOUN	NN	Number=Sing	4	nsubj	_	_
4	turns	turn	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	blue	blue	ADJ	JJ	Degree=Pos	7	amod	_	SpaceAfter=No
6	-	-	PUNCT	HYPH	_	5	punct	_	SpaceAfter=No
7	green	green	ADJ	JJ	Degree=Pos	4	xcomp	_	_
8	upon	upon	ADP	IN	_	10	case	_	_
9	the	the	DET	DT	Definite=Def|PronType=Art	10	det	_	_
10	addition	addition	NOUN	NN	Number=Sing	4	obl	_	_
11	of	of	ADP	IN	_	13	case	_	_
12	a	a	DET	DT	Definite=Ind|PronType=Art	13	det	_	_
13	substance	substance	NOUN	NN	Number=Sing	10	nmod	_	SpaceAfter=No
14	.	.	PUNCT	.	_	4	punct	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **turn** | present | Red cabbage indicator |  |  | the addition of a substance |  | green *property* | vn roll-51.3.1 «NP V PP.trajectory»: agent=Theme upon addition=Trajectory |

<!-- .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 substance.

```conllu
# sent_id = question:chemistry:36-olympiad-kitchen-chemistry-puzzles:e3:2
# text = Ascertain the substance.
1	Ascertain	ascertain	VERB	VB	Mood=Imp|VerbForm=Fin	0	root	_	_
2	the	the	DET	DT	Definite=Def|PronType=Art	3	det	_	_
3	substance	substance	NOUN	NN	Number=Sing	1	obj	_	SpaceAfter=No
4	.	.	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 substance |  |  |  |  | vn discover-84 «NP V NP»: agent=Agent substance=Topic |

## The options {#options}

### Option 1 · ← Mova's choice {#o1}

<!-- .ven lang=en -->
White wine vinegar

```conllu
# sent_id = question:chemistry:36-olympiad-kitchen-chemistry-puzzles:e3:o1:1
# text = White wine vinegar
1	White	white	ADJ	JJ	Degree=Pos	3	amod	_	_
2	wine	wine	NOUN	NN	Number=Sing	3	compound	_	_
3	vinegar	vinegar	NOUN	NN	Number=Sing	0	root	_	_
```

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

### Option 2 · ✓ the right answer {#o2}

<!-- .ven lang=en -->
Baking soda dissolved in water

```conllu
# sent_id = question:chemistry:36-olympiad-kitchen-chemistry-puzzles:e3:o2:1
# text = Baking soda dissolved in water
1	Baking	baking	NOUN	NN	Number=Sing	2	compound	_	_
2	soda	soda	NOUN	NN	Number=Sing	0	root	_	_
3	dissolved	dissolve	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	2	acl	_	_
4	in	in	ADP	IN	_	5	case	_	_
5	water	water	NOUN	NN	Number=Sing	3	obl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **dissolve** | participle |  | Baking soda *not said here* |  | water |  |  | vn break-45.1 «NP.patient V»: agent=Patient |

### Option 3 {#o3}

<!-- .ven lang=en -->
Lemon juice

```conllu
# sent_id = question:chemistry:36-olympiad-kitchen-chemistry-puzzles:e3:o3:1
# text = Lemon juice
1	Lemon	lemon	NOUN	NN	Number=Sing	2	compound	_	_
2	juice	juice	NOUN	NN	Number=Sing	0	root	_	_
```

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

### Option 4 {#o4}

<!-- .ven lang=en -->
Plain tap water with nothing added

```conllu
# sent_id = question:chemistry:36-olympiad-kitchen-chemistry-puzzles:e3:o4:1
# text = Plain tap water with nothing added
1	Plain	plain	ADJ	JJ	Degree=Pos	3	amod	_	_
2	tap	tap	NOUN	NN	Number=Sing	3	compound	_	_
3	water	water	NOUN	NN	Number=Sing	0	root	_	_
4	with	with	ADP	IN	_	5	case	_	_
5	nothing	nothing	PRON	NN	Number=Sing|PronType=Neg	3	nmod	_	_
6	added	add	VERB	VBN	Tense=Past|VerbForm=Part|Voice=Pass	3	acl	_	_
```

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **add** *speech: assert* | participle |  | Plain tap water with nothing *not said here* |  |  |  |  | vn mix-22.1-2 «NP V ADVP-Middle»: agent=Patient |

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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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