Chemistry Quiz: Why Do Onions Make You Cry?

Most people's memory of chemistry class is a stack of flashcards: formulas, definitions, and symbols memorized on Thursday and gone by Monday. That style of teaching buries the best parts of the subject. Chemistry explains why onions make you cry, why ice floats when almost no other solid does, and where a burning log's mass actually goes. Those are the questions worth asking, and they are the ones this quiz asks.

The template runs fourteen scored questions on the chemistry hiding in plain sight, rated medium difficulty with an estimated run time of five to eight minutes. Every question is worth 10 points toward a 140 point total, feedback appears the instant a taker answers, and each answer comes with a short written explanation of the science behind it.

Boiling pots, crying cooks, and a soda geyser that is not a reaction

The quiz starts at the stove and works outward. The opening question asks what the bubbles in a rolling boil are mostly made of, with "air that was dissolved in the water" sitting there as a very tempting wrong answer. From there it moves through the kitchen and the street: "Why does chopping an onion make you cry?", how soap pulls grease off your hands, what road salt actually does to ice, and why dry ice fogs without leaving a puddle.

Two questions are select-all-that-apply. One asks which common drinks are more acidic than black coffee, and the other asks takers to separate chemical changes from physical ones, with baking a cake and shattering glass on the same list. A handful of true or false statements round things out, including the famous Mentos and cola geyser, which the question itself cheerfully labels a trap.

A shortcut for science teachers and tutors

Teachers reach for a quiz like this on review days, as a first week icebreaker, or as an exit ticket after a unit on states of matter, acids and bases, or chemical reactions. Because explanations display right after each answer, the quiz teaches while it grades: a student who picks hydrogen bonds as the glue inside a water molecule immediately reads why covalent bonds are the right call and why that distractor fools so many people.

Tutors get something slightly different out of it: a diagnostic. The wrong answers are built around real misconceptions, so the specific questions a student misses point straight at the concepts that need another pass. Question order shuffles on every run, which keeps a second attempt honest, and the built in leaderboard gives a class or study group something to chase.

Where most takers will stumble

The medium rating is earned. There are footholds, like the true or false item about ice floating on liquid water, but several questions punish half knowledge. The pH question requires knowing that cola sits near pH 2.5, more acidic than the coffee people worry about. The logarithmic scale question trips anyone who assumes pH steps are linear. And the stainless steel question rewards takers who know chromium, not polish, is what keeps it bright.

The pass threshold is set at 65, skipping questions is switched off, and takers can move back to earlier questions before finishing. A progress bar shows how far along they are, and there is no timer, so nobody is racing a clock; the quiz measures understanding, not reading speed.

Rewrite it for your syllabus in minutes

Every question, answer option, explanation, and point value opens in the editor. Raise the pass mark for an exam prep group, trim the quiz down for a five minute warm up, or swap in problems from this week's lab. The leaderboard, retake, shuffle, and feedback settings are all simple toggles, and you can dress the whole thing in your own logo and school colors. The template sits on Uplup's free tier, so copying it and rebuilding it costs nothing.

Send a link, post a QR code, or drop it into a lesson page

A finished quiz travels as a plain link, a QR code on a slide or worksheet, or a social share. It can also live inside your own pages through an embed snippet, and sites running WordPress get a shortcode from the Uplup plugin that does the same job. As responses come in, the analytics view breaks results down question by question, which turns a night of grading into a glance: if half the class missed the covalent bond item, Monday's lesson plans itself. Responses export to CSV, and webhooks or Zapier can push them wherever your gradebook lives.