Glass and pottery

Tests: 3 of 11 right · Exam: 0 of 4 right · Kind: ★★ · Understood: 10 of 15 · Run: 2026-10-18, commit f3c23ea72

Lesson 30 of the chemistry course of Mova's primary school, as Mova's small model took its tests: it had read this lesson and the ones before it and learned from their exercises. Each test shows the options in the order the student saw them, its choice, the right answer, the score of every option and why it chose. The lesson itself, sentence by sentence with trees and pragmatics: the lesson in the corpora.

Every question of this lesson and each of its options parsed by Mova, with trees and pragmatics: the lesson's questions in the corpora.

Test 1 · ★★ · right ✓

Max: "old church windows are thicker at the bottom 'cos glass slowly drips down". What's true?

1. The bottom got thicker from dirt — no support
2. He's right, glass is a very slow liquid that drips — no support
3. The top was worn down by the rain — no support
4. They were made uneven; glass does not flow — ← Mova's choice · ✓ the right answer · score 4

Why: It took the question to ask which statement is true. It chose option 4 with score 4, the only option with support. Its support: lesson 4, line 19: «Glass is a solid with jumbled particles; the idea that old windows are thick at the bottom because glass flows is a myth: old panes were simply made uneven, an…», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+4); the same property (+1). Against it: a different thing acted on (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 2 · ★★ · wrong ✗

"smashed a glass, crap, I'll just grab the bits quick". What should you do instead?

1. Grab the big bits with wet hands — no support
2. Use a brush and dustpan, not bare hands — ✓ the right answer · no support
3. Throw a towel over them and walk off — no support
4. Stand on them to make them smaller — ← Mova's choice · score 6

Why: It took the question to ask what is done. It chose option 4 with score 6, the only option with support. Its support: lesson 8, line 12: «Left to stand, the heavier bits in muddy water settle to the bottom; water works use settling tanks.», reached through the option's own match among the sentences about the question's things. What matched: it fills the role the question asks for (+3); the same action «stand» (+2); the same circumstance (+2). Against it: a different doer (counts against) (-1). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 3 · ★★ · right ✓

If the whole windscreen of a car broke into tiny pieces in a crash, what would go wrong?

1. The car would go faster — no support
2. Nothing, that is how it is meant to work — no support
3. The car would become waterproof — no support
4. Pieces could fly at people inside — ← Mova's choice · ✓ the right answer · score 4

Why: It took the question to ask who or what does it. It chose option 4 with score 4, the only option with support. Its support: lesson 29, line 9: «Plastic lasts hundreds of years and slowly breaks into tiny pieces called microplastics, because few microbes can eat it.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same doer «tiny pieces» (+2). Against it: a different action (counts against) (-1). · the question and its options parsed, with trees and pragmatics

Test 4 · ★★ · wrong ✗

Gran's mug has no glaze inside. What will happen when she fills it with tea?

1. The tea will freeze at once — no support
2. The mug will melt in the heat — ← Mova's choice · score -1
3. Some tea will soak into the clay — ✓ the right answer · no support
4. The tea will turn into glaze — score -1

Why: It took the question to ask what happens next. It chose option 2 with score -1, tied with another option at -1 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 6, line 1: «Stir sugar into hot tea and it seems to vanish, yet the tea tastes sweet: the sugar has dissolved, not disappeared.», reached through what followed the sentence the question matched. What matched: the same action «dissolve» (+1). Against it: a different doer (counts against) (-2). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 5 · ★★ · right ✓

A wizard in a cartoon turns sand into glass just by waving a wand. What does it really take?

1. Squeezing sand very, very hard by hand — score 3
2. Leaving sand out in the hot sun for a whole day — score 3
3. Melting sand with other things at great heat — ← Mova's choice · ✓ the right answer · score 11
4. Mixing sand with cold water — score 3

Why: It took the question to ask what it is done to. It chose option 3 with score 11, against 3 for the next best. Its support: lesson 30, line 1: «A window pane is made of sand. Sand is melted with soda and crushed limestone in a furnace hotter than 1000 °C, and the glowing runny glass is cooled into shee…», reached through the remembered sentence the question matched. What matched: the same action «melt» (+5); it fills the role the question asks for (+4); the same thing acted on «sand» (+2). · the question and its options parsed, with trees and pragmatics

Test 6 · ★★ · wrong ✗

Ruby finds a frosty green pebble on the beach: "is it a gem?" Most likely?

1. A frozen drop of sea water — ← Mova's choice · no support
2. A piece of green plastic from a toy — no support
3. A real emerald from a sunken pirate shipwreck — no support
4. Old bottle glass rubbed by the sea for years — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 7 · ★★ · wrong ✗

"my phone's 'unbreakable glass', so I can drop it on its corner, no problem". Right?

1. No, a hit on the corner can still crack it — ✓ the right answer · no support
2. Yes, toughened glass never breaks — ← Mova's choice · score 2
3. Yes, corners are the strongest part — no support
4. No, it only cracks when it is wet — score 2

Why: It took the question to ask which statement is true. It chose option 2 with score 2, tied with another option at 2 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 30, line 8: «Oven glass expands very little when heated, so it does not crack in the oven; ordinary glass can crack when heated or cooled unevenly, for example a hot dish p…», reached through the option's own match among the sentences about the question's things. What matched: the same action «crack» (+1); the same doer «glass» (+1). The right option, 1, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Test 8 · ★★ · wrong ✗

If people stopped recycling bottles, what would be needed more?

1. Sand and energy to make new glass — ✓ the right answer · score 5
2. More clay for new mugs — no support
3. Less of anything at all — ← Mova's choice · score 6
4. Much more oil for making new plastic bottles — no support

Why: It took the question to ask who or what does it. It chose option 3 with score 6, against 5 for the next best. Its support: lesson 30, line 14: «Glass can be melted and made into new bottles again and again without wearing out, and melting old glass needs less energy than making it from sand.», reached through the remembered sentence the question matched. What matched: the same property (+4); the same action «need» (+2). The right option, 1, scored 5. · the question and its options parsed, with trees and pragmatics

Test 9 · ★★ · wrong ✗

Which is natural glass?

1. A pottery plate — ← Mova's choice · no support
2. A clay brick — no support
3. A phone screen — no support
4. Obsidian from a volcano — ✓ the right answer · no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 10 · ★★ · wrong ✗

Your video call to Australia travels under the ocean. In what?

1. Electricity in the sea water — ← Mova's choice · no support
2. Light in thin glass fibres — ✓ the right answer · no support
3. Sound travelling in metal pipes — no support
4. Water pumped in rubber hoses — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Test 11 · ★★ · wrong ✗

Why can you not just put a clay pot from the art class into the kiln wet and soggy?

1. The kiln would turn it to mud — no support
2. Wet clay turns into glass in the heat — ← Mova's choice · score 6
3. Wet clay never gets hard — score 4
4. It must dry first or it may crack — ✓ the right answer · score 6

Why: It took the question to ask why something happens (its cause). It chose option 2 with score 6, tied with another option at 6 (the first shown, or the one claiming less beyond what it knows, wins). Its support: lesson 30, line 4: «Pottery is different: soft clay is shaped and then baked in a very hot oven called a kiln until it turns hard as stone. A shiny glaze, which is a thin coat of…», reached through the same lesson line as the sentence the question matched. What matched: the same action «turn» (+3); the same doer «clay» (+3). The right option, 4, scored 6. · the question and its options parsed, with trees and pragmatics

Exam question 1 · formal language · wrong ✗

Identify the principal raw materials from which ordinary window glass is manufactured.

1. Iron ore and carbon — ← Mova's choice · no support
2. Sand, soda and limestone — ✓ the right answer · no support
3. Clay, water and straw — no support
4. Oil and natural gas — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

Exam question 2 · formal language · wrong ✗

Which of the following statements most accurately characterises the arrangement of particles in glass?

1. The particles are separated by pockets of air — no support
2. The particles flow slowly downwards over centuries — ← Mova's choice · score 4
3. The particles are disordered rather than arranged in crystals — ✓ the right answer · no support
4. The particles are arranged in perfect cubes — no support

Why: It took the question to ask who or what does it. It chose option 2 with score 4, the only option with support. Its support: lesson 5, line 2: «Heat makes particles shake harder until they break free: ice melts, and water evaporates or boils; cooling slows them so they stick together again.», reached through the same lesson line as the sentence the question matched. What matched: it fills the role the question asks for (+3); the same doer «particles» (+2). Against it: a different action (counts against) (-1). The right option, 3, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 3 · formal language · wrong ✗

It is given that a heated vessel of ordinary glass is plunged into cold water. Select the outcome most consistent with the established facts.

1. The vessel will soften and deform into a new shape — no support
2. The vessel may fracture owing to uneven contraction — ✓ the right answer · no support
3. The vessel will become stronger — no support
4. The vessel will dissolve in the water — ← Mova's choice · score 3

Why: It took the question to ask which statement is true. It chose option 4 with score 3, the only option with support. Its support: lesson 6, line 14: «Gases dissolve in water too; fish breathe oxygen dissolved in the water, taking it in through their gills, and warm water holds less of it.», reached through the option's own match among the sentences about the question's things. What matched: the same place «water» (+2); the same action «dissolve» (+1). The right option, 2, found no support in what it remembers. · the question and its options parsed, with trees and pragmatics

Exam question 4 · formal language · wrong ✗

Ascertain the function of a glaze upon an article of pottery.

1. It conducts heat away from the contents — ← Mova's choice · no support
2. It reduces the mass of the article considerably — no support
3. It forms a thin vitreous coating that renders the article waterproof — ✓ the right answer · no support
4. It renders the article unbreakable — no support

Why: No option found support in what it remembers, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics

This page in Markdown → https://md.mova.elamur.ai/free/en/school-run/chemistry/30-glass-and-pottery/