Elements and the famous members of the periodic table
Tests: 9 of 10 right · Exam: 3 of 4 right · Kind: plain · Understood: 8 of 14 · Run: 2026-10-18, commit f3c23ea72
Lesson 2 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 ✓
Your cousin says: "Fe on that poster is short for Fe-iron, obviously." What is the real reason for Fe?
- 1. It stands for "fixed element" — no support
- 2. It is short for "feather metal", because iron is so light — no support
- 3. It comes from the old Latin name for iron, ferrum — ← Mova's choice · ✓ the right answer · score 3
- 4. Iron was first found by a scientist called Fe — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 3, the only option with support. Its support: lesson 2, line 20: «Each element has a short symbol: Na for sodium, Cl for chlorine, Fe for iron, Au for gold; some come from old Latin names, like Fe from ferrum, the Latin word…», reached through the same lesson line as the sentence the question matched. What matched: the same action «come» (+2); the same place «old latin names» (+2). Against it: a different doer (counts against) (-1). · the question and its options parsed, with trees and pragmatics
Test 2 · right ✓
"why'd anyone make wedding rings outta gold and not iron, iron's way cheaper innit" Best answer?
- 1. Gold stays shiny for ages, iron would rust — ← Mova's choice · ✓ the right answer · no support
- 2. Iron rings are against the law — no support
- 3. Gold is the only metal that can be bent — no support
- 4. Iron is far too heavy to wear on a finger all day — 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 3 · right ✓
In a game, a character breathes helium from a big gas tank and just talks squeaky. What is wrong?
- 1. Breathing from a tank can harm the lungs and starve you of oxygen — ← Mova's choice · ✓ the right answer · score 8
- 2. Nothing is wrong, it is a safe trick for everyone, even from a big tank — no support
- 3. Helium would make the character float away — no support
- 4. Helium would set the character on fire — no support
Why: It took the question to ask which statement is true. It chose option 1 with score 8, the only option with support. Its support: lesson 2, line 14: «Breathing helium from a gas tank is dangerous: it can harm the lungs and leaves the body without oxygen.», reached through the remembered sentence the question matched. What matched: the same action «breathe» (+4); the same place «gas tank» (+4). · the question and its options parsed, with trees and pragmatics
Test 4 · right ✓
Your friend says: "Spinach is the best food for iron by miles, that's why Popeye is strong." Put him right.
- 1. Iron only comes from tablets — no support
- 2. Spinach contains no iron at all — no support
- 3. That story is exaggerated; meat, beans and lentils are as good or better — ← Mova's choice · ✓ the right answer · score 4
- 4. He is right, spinach is the only food in the world that has any iron in it — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 4, the only option with support. Its support: lesson 2, line 19: «Iron in red blood cells helps carry oxygen around the body; meat, beans and lentils are good sources, and spinach is not as iron-rich as the old story says.», reached through the same lesson line as the sentence the question matched. What matched: the same doer «beans» (+2); the same property (+1); the same light verb (be, have, do, get, go) (+1). · the question and its options parsed, with trees and pragmatics
Test 5 · wrong ✗
What would happen if you cooled mercury to minus 50 degrees?
- 1. It would stay liquid forever — ← Mova's choice · no support
- 2. It would boil away and turn into a gas — no support
- 3. It would turn into silver — no support
- 4. It would freeze into a solid metal — ✓ the right answer · no support
Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Test 6 · right ✓
Sodium fizzes violently in water and chlorine is a poisonous gas. Why is table salt safe?
- 1. Joined together they make a new substance with new behaviour — ← Mova's choice · ✓ the right answer · score 6
- 2. Salt has only a tiny bit of each, too little to hurt — no support
- 3. Salt is not really made of sodium and chlorine — score 0
- 4. The poison is boiled out in the factory before the salt is packed — no support
Why: It took the question to ask why something happens (its cause). It chose option 1 with score 6, against 0 for the next best. Its support: lesson 2, line 7: «Sodium is a soft metal that fizzes wildly in water and chlorine is a poisonous gas, but joined together they make a new, safe substance: ordinary table salt.», reached through the same lesson line as the sentence the question matched. What matched: the same action «make» (+2); the same doer «water» (+2); the same thing acted on «new safe substance» (+2). · the question and its options parsed, with trees and pragmatics
Test 7 · right ✓
A diamond is thrown into a very hot furnace. What could happen?
- 1. Nothing at all, because diamonds can never change in any way — no support
- 2. It can burn, because it is just carbon like coal — ← Mova's choice · ✓ the right answer · score 6
- 3. It would melt into glass — no support
- 4. It would turn into gold — no support
Why: It took the question to ask what happens next. It chose option 2 with score 6, the only option with support. Its support: lesson 2, line 12: «Diamond and pencil graphite are both pure carbon; the atoms are arranged differently, a strong 3-D cage in diamond and sliding flat sheets in graphite; coal is…», reached through the option's own match among the sentences about the question's things. What matched: the same action «burn» (+2); the same doer «diamond» (+2); its «because» matches the remembered cause (+2). · the question and its options parsed, with trees and pragmatics
Test 8 · right ✓
"pff my mate says helium was found in a cave in Texas first" What is the truth?
- 1. It was first found in the Sun's light, before it was found on Earth — ← Mova's choice · ✓ the right answer · score 14
- 2. It was first found at the bottom of the sea — score 10
- 3. It was first made in a lab in a school, by children doing an experiment — score 4
- 4. He is right, it is named after Texas — no support
Why: It took the question to ask which statement is true. It chose option 1 with score 14, against 10 for the next best. Its support: lesson 2, line 13: «Helium is lighter than air, so helium balloons float; it was first found in the Sun's light, and its name comes from the Greek for "Sun".», reached through the remembered sentence the question matched. What matched: the same action «find» (+4); the same thing acted on «helium» (+4); the same place «light» (+4); the same property (+2). · the question and its options parsed, with trees and pragmatics
Test 9 · right ✓
If oxygen made up all the air instead of a fifth, what would be the danger?
- 1. Fires would be impossible — no support
- 2. All the balloons would float away — no support
- 3. Things would burn much more fiercely — ← Mova's choice · ✓ the right answer · score 5
- 4. Nobody could breathe at all — no support
Why: It took the question to ask which statement is true. It chose option 3 with score 5, the only option with support. Its support: lesson 2, line 11: «Our bodies use oxygen to get energy from food, and fires need oxygen too: with more oxygen, things burn much more fiercely.», reached through the option's own match among the sentences about the question's things. What matched: the same action «burn» (+2); the same doer «things» (+2); the same property (+1). · the question and its options parsed, with trees and pragmatics
Test 10 · right ✓
Your sister says: "The periodic table is just in alphabetical order." Put her right.
- 1. It is in order of the number of protons in each atom — ← Mova's choice · ✓ the right answer · score 8
- 2. It is in order of who discovered them first, from the oldest to the newest — no support
- 3. It is in order of colour — no support
- 4. She is right, it starts with A and ends with Z — no support
Why: It took the question to ask which statement is true. It chose option 1 with score 8, the only option with support. Its support: lesson 2, line 8: «Elements in the periodic table are in order of the number of protons in their atoms.», reached through the remembered sentence the question matched. What matched: the same place «order» (+4); the same circumstance (+4); the same light verb (be, have, do, get, go) (+2). Against it: a different doer (counts against) (-2). · the question and its options parsed, with trees and pragmatics
Exam question 1 · formal language · right ✓
Which of the following statements most accurately characterises a chemical element?
- 1. A substance composed exclusively of atoms of a single kind — ← Mova's choice · ✓ the right answer · no support
- 2. A substance invariably solid at ordinary temperatures — no support
- 3. A substance composed of several metals in combination — no support
- 4. A substance found only in laboratories — 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 ✗
Identify the principal reason for which gold retains its lustre over millennia.
- 1. The continual polishing it receives from its owners — ← Mova's choice · no support
- 2. The exceptional mass of its constituent atoms — no support
- 3. Its negligible reactivity with atmospheric oxygen and with water — ✓ the right answer · no support
- 4. Its concealment beneath a transparent protective lacquer applied by goldsmiths — 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 3 · formal language · right ✓
Select the response that is consistent with the established facts concerning diamond and graphite.
- 1. Both consist solely of carbon, the arrangement of the atoms differing — ← Mova's choice · ✓ the right answer · no support
- 2. Both consist of silicon in differing quantities — no support
- 3. Diamond consists of carbon, whereas graphite consists of the metal lead — no support
- 4. Graphite consists of carbon whereas diamond consists of glass — no support
Why: Nothing it remembers matched the question, so it guessed: it took the first option shown. · the question and its options parsed, with trees and pragmatics
Exam question 4 · formal language · right ✓
It is given that the atmosphere is inhaled. Ascertain the constituent present in the greatest proportion.
- 1. Nitrogen — ← Mova's choice · ✓ the right answer · no support
- 2. Oxygen — no support
- 3. Carbon dioxide — no support
- 4. Helium — no support
Why: Nothing it remembers matched the question, 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/2-elements-and-the-periodic-table/