Free quiz · 8 questions · Warm-up to Boss
Chemistry quiz
How well do you really know Chemistry? These 8 questions start easy and end with a Boss round. There are no multiple choice options: you type what you know, and every answer is checked against the key facts.
60 seconds a question, one 2x boost, and a leaderboard. Playing with friends writes a fresh set of Chemistry questions for your group.
The questions
- Warm-up
Plants are tiny air chefs: which gas do they take in for photosynthesis, and what element does that gas supply?
Show the answer
- Carbon dioxide (CO₂)
- It supplies carbon
- Plants use it in photosynthesis
- Warm-up
Water’s molecule has a tiny head count: which two elements are in it, and how many atoms of each are there?
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- Hydrogen
- Oxygen
- Two hydrogen atoms and one oxygen atom
- Easy
Earth’s air has a leading ingredient—what gas makes up most of it, and about what share of the atmosphere is that?
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- Nitrogen
- About 78% of Earth’s atmosphere
- Oxygen makes up about 21% of the atmosphere
- Easy
An atom gains or loses electrons and changes its status: how does an ion differ in charge, and what electron change creates one?
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- An atom is electrically neutral
- An ion has a net electric charge
- An ion forms when an atom gains or loses electrons
- Easy
At room temperature, what number marks neutral pH, and which two ion concentrations are equal in a neutral solution?
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- Neutral pH is 7 at room temperature.
- Hydrogen ion and hydroxide ion concentrations are equal.
- Medium
Gold’s symbol looks like a secret code: what two-letter symbol represents it, and what Latin word inspired that symbol?
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- Au
- The A is uppercase and the u is lowercase
- The symbol comes from the Latin word aurum
- Medium
Drop table salt into water: what feature of water helps it dissolve the salt, and what happens to the salt’s ions?
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- Water molecules are polar
- Water attracts the charged sodium and chloride ions
- The ions separate from the crystal and become surrounded by water molecules
- Boss
At an ammonia factory using the Haber process, what two gases react, which catalyst helps, and what temperature and pressure are typical?
Show the answer
- Nitrogen gas reacts with hydrogen gas.
- The catalyst is iron.
- A typical temperature is about 450°C.
- A typical pressure is about 150–200 atmospheres.
How scoring works
- Each question has 2 or 3 key facts. Each one earns full, half or no credit, so a wrong answer scores zero.
- Later questions are worth more, fast answers earn a bonus, and great answers in a row build a streak.
- A famous myth or a clear factual error halves the points.
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