🔬 Chemistry & Matter Trivia Questions & Answers
Elements, reactions, the periodic table and the stuff everything's made of. Below are 30 free chemistry & matter trivia questions with answers — part of Science trivia on BUZZ. Want a real challenge that adapts to what you know? Play the Science quiz — no signup needed to start.
30 Chemistry & Matter trivia questions
Q1. What is the chemical symbol for the element sodium?
Answer: Na
💡 Na comes from natrium, sodium's Latin name and the root behind natron, an ancient salt.
Q2. Which of these is by far the most common state of matter in the universe?
Answer: Plasma
💡 Stars are giant balls of plasma, so over 99% of the visible universe isn't solid, liquid, or gas.
Q3. Which gas makes up roughly a fifth of the air and is needed for things to burn?
Answer: Oxygen
💡 Oxygen itself doesn't burn; it's the reactant that lets other fuels combust.
Q4. What is the chemical formula for water?
Answer: H₂O
💡 Water is the only substance on Earth that naturally exists in all three states: solid, liquid, and gas.
Q5. What is the smallest unit of matter?
Answer: Atom
💡 Atoms are mostly empty space — if an atom were the size of a football stadium, the nucleus would be the size of a pea.
Q6. What is the atomic number of carbon?
Answer: 6
💡 Carbon forms the backbone of all known life on Earth and can form millions of different compounds.
Q7. What is the chemical symbol for Gold?
Answer: Au
💡 Au comes from the Latin word 'aurum' meaning gold.
Q8. What is the chemical formula for table salt?
Answer: NaCl
💡 Table salt (sodium chloride) was historically so valuable that Roman soldiers were sometimes paid in it — the origin of the word 'salary'.
Q9. What is the boiling point of water at sea level in Celsius?
Answer: 100°C
💡 Water boils at a lower temperature at higher altitudes because atmospheric pressure decreases.
Q10. What does pH measure in a liquid?
Answer: Acidity or alkalinity
💡 pH stands for 'potential of hydrogen'. A pH of 7 is neutral; below 7 is acidic, above 7 is alkaline.
Q11. What is H₂O₂ commonly called?
Answer: Hydrogen peroxide
💡 Hydrogen peroxide looks just like water but is far more reactive. Even a small concentration fizzes visibly when it meets organic matter.
Q12. What is the common name for the pungent compound with formula NH₃?
Answer: Ammonia
💡 Ammonia is a key building block for fertilisers and gives some cleaning products their sharp smell.
Q13. Which alloy is produced by combining copper with zinc?
Answer: Brass
💡 Bronze, brass's cousin, swaps the zinc for tin, the mix that named the Bronze Age.
Q14. Which flammable gas bubbles off when a reactive metal is dropped into acid?
Answer: Hydrogen
💡 The classic test lights a splint near the gas to hear a squeaky pop as it ignites.
Q15. Which colour does litmus paper turn when dipped in an acidic solution?
Answer: Red
💡 The same paper turns blue in a base, making litmus a quick two-way chemical detector.
Q16. What is the half-life of Carbon-14?
Answer: 5,730 years
💡 Carbon-14 dating is used to determine the age of organic materials up to about 50,000 years old.
Q17. What is the name of the process where a solid turns directly into a gas without passing through liquid?
Answer: Sublimation
💡 Dry ice (solid CO₂) sublimates at -78.5°C at standard atmospheric pressure.
Q18. Which metal melts in your palm, turning liquid at just under 30°C?
Answer: Gallium
💡 Gallium's melting point is about 29.76°C, just below normal skin temperature, so a solid gallium spoon will visibly liquefy in your hand — a classic science-shop prank.
Q19. Which everyday material is an amorphous solid, not a true crystal, due to disordered atoms?
Answer: Glass
💡 Unlike table salt or quartz, glass's atoms never settle into the repeating lattice of a true crystal — chemists call this a 'glassy' or amorphous solid state.
Q20. What do chemists call the number of atoms in exactly one mole of a substance, roughly 6.022 x 10^23?
Answer: Avogadro's number
💡 Avogadro's number is so enormous that if you had that many basketballs, they'd cover the entire Earth in a layer several miles deep.
Q21. Superglue's fast bonding is triggered by an unlikely everyday substance in the air — what sets it?
Answer: Moisture
💡 Superglue is made of cyanoacrylate, which polymerizes almost instantly on contact with trace water vapor — even the moisture in your skin's surface is enough to make it bond fast.
Q22. Which putty toy came from a failed WWII attempt at making synthetic rubber?
Answer: Silly Putty
💡 Silly Putty started life as a US wartime experiment to replace rubber with a silicone polymer — the goo bounced and stretched but was useless for tires, so it became a toy instead.
Q23. What is the hardest natural substance?
Answer: Diamond
💡 Diamond scores 10 on the Mohs hardness scale — the highest possible. It's roughly 58 times harder than any other naturally occurring material.
Q24. What is the pH of a neutral solution?
Answer: 7
💡 pH 7 is neutral (pure water). Below 7 is acidic (lemon juice ~2), above 7 is alkaline (bleach ~13). The pH scale runs from 0–14.
Q25. Which gas is produced when an acid reacts with a carbonate?
Answer: Carbon dioxide
💡 Acid + carbonate → salt + water + CO₂. This is why vinegar (acetic acid) fizzes on baking soda (sodium bicarbonate) — classic kitchen chemistry.
Q26. Which kind of chemical bond forms when two atoms share pairs of electrons?
Answer: Covalent bond
💡 In an ionic bond, by contrast, one atom hands its electrons over rather than sharing them.
Q27. What does an element's atomic number actually count?
Answer: Number of protons
💡 Change the proton count and you change the element itself; that single number defines it.
Q28. A catalyst changes how fast a reaction runs, but ends up in what condition?
Answer: Not used up
💡 Enzymes are biological catalysts, speeding up the body's reactions millions of times over.
Q29. What is the name for a reaction that gives off heat to its surroundings?
Answer: Exothermic
💡 An endothermic reaction does the reverse, drawing heat in and often turning cold to the touch.
Q30. Which everyday event is a chemical change rather than just a physical one?
Answer: Iron rusting
💡 Rusting bonds iron to oxygen into a brand-new compound; melting only rearranges the same molecules.
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