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Some of ChemQuest’s cast are still learning. When you teach them, YOU learn it best — catch what they get wrong, then quiz them.
Teach Tugger
You be the teacher — Tugger is still learning. Helping Tugger figure it out is the practice. (Tugger's progress stays on this device; nothing is sent anywhere.)
🎓 In a minute you'll be the teacher. Get ready to teach Tugger: ionic bonding.
In an ionic bond, a metal gives electrons to a non-metal. In a covalent bond, two non-metals share electrons.
You've helped them one at a time. The real understanding is how the ideas CONNECT — teach that next.
Tugger (ionic bond — one atom transfers its electron fully to another) ×Sharer (covalent bond — two atoms share a pair of electrons equally)
Both are about one pair of electrons between two atoms. What single thing decides Tugger vs Sharer?
Tugger then says: “Any two atoms just pick sharing or transferring at random.” — is that right?
The link: ionic and covalent aren't separate clubs — they're the two ends of the electron-pull spectrum.
Small pull-gap: share. Big pull-gap: hand it over.
Oxy (oxygen — strongly electronegative, pulls shared electrons toward itself) ×Whisperer (hydrogen bond — the weak attraction that lines water molecules up)
Why can't Whisperer's hydrogen bond form between two Helio (helium) atoms — only where an Oxy is involved?
Oxy then says: “A hydrogen bond is just a regular covalent bond that's a bit weaker.” — is that right?
The link: the hydrogen bond is downstream of electronegativity — Oxy's pull creates the charge Whisperer reaches for.
Oxy grabs the electrons; the leftover charge is what Whisperer holds.
Capstone — build water and salt together
Two everyday substances, three kinds of bond. Bring in the right cast member for each.
Table salt: Sodi hands its electron to Chlora entirely. What bond forms?
Who do you bring in?
Inside one water molecule, O and H hold a shared electron pair. What bond?
Who do you bring in?
Between separate water molecules — the pull that gives ice its shape and water its surface tension. What bond?
Who do you bring in?
The synthesis: strong bonds hold each molecule together (ionic/covalent), and the weak hydrogen bond arranges the molecules into water and ice — different jobs, one system.
Transfer, share, and whisper — three bonds make water behave like water.
