Chemistry Trivia Questions for Kids (with Answers)
Use this printable trivia list for warm-ups or revision. Tap any question to reveal the answer and fun fact — then play the full interactive round in Brain Play (ten random questions from the same bank).
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Questions & answers
Tap a question to reveal the answer. 35 questions below.
1. What is H₂O commonly called?Show answer
- Salt
- Water — correct
- Sugar
- Air
H₂O means two hydrogen atoms and one oxygen atom — that's water!
2. What gas do humans breathe in?Show answer
- Carbon dioxide
- Oxygen — correct
- Helium
- Nitrogen only
Your lungs take in oxygen from the air so your body can make energy.
3. What is the chemical symbol for oxygen?Show answer
- Ox
- O — correct
- Og
- Oy
Oxygen's symbol is just the letter O.
4. What is the chemical symbol for hydrogen?Show answer
- Hy
- H — correct
- He
- Hg
Hydrogen is the lightest element and its symbol is H.
5. What is the chemical symbol for carbon?Show answer
- Ca
- Co
- C — correct
- Cr
Carbon is in diamonds, pencil "lead," and every living thing — symbol C.
6. What is the chemical symbol for nitrogen?Show answer
- Ni
- N — correct
- Na
- Ne
Nitrogen makes up most of the air we breathe — symbol N.
7. What is the chemical symbol for iron?Show answer
- Ir
- In
- Fe — correct
- I
Iron's symbol Fe comes from the Latin word ferrum.
8. What is the chemical symbol for gold?Show answer
- Go
- Gd
- Ag
- Au — correct
Gold's symbol Au comes from the Latin word aurum.
9. What is the chemical symbol for silver?Show answer
- Si
- Sv
- Ag — correct
- Sr
Silver's symbol Ag comes from the Latin word argentum.
10. What is the chemical symbol for sodium?Show answer
- So
- Sd
- Na — correct
- S
Sodium's symbol Na comes from the Latin word natrium.
11. What is the chemical symbol for chlorine?Show answer
- Ch
- Cl — correct
- Cr
- Co
Chlorine is in table salt when paired with sodium — symbol Cl.
12. What is the chemical symbol for helium?Show answer
- H
- He — correct
- Hl
- Hm
Helium is a light gas used in party balloons — symbol He.
13. What are the three common states of matter?Show answer
- Solid, liquid, gas — correct
- Hot, cold, warm
- Rock, water, fire
- Metal, wood, plastic
Most everyday stuff is a solid, a liquid, or a gas.
14. Ice is water in which state of matter?Show answer
- Gas
- Liquid
- Solid — correct
- Plasma
Freezing turns liquid water into solid ice.
15. Steam is water in which state of matter?Show answer
- Solid
- Liquid
- Gas — correct
- Crystal
When water boils, it becomes water vapor (a gas).
16. What happens to liquid water when it freezes?Show answer
- It becomes a gas
- It becomes a solid — correct
- It disappears
- It turns into salt
Freezing is when a liquid becomes a solid.
17. What happens to ice when it melts?Show answer
- It becomes a gas
- It becomes a liquid — correct
- It becomes metal
- It stays solid
Melting turns a solid into a liquid.
18. What do we call the change from liquid to gas?Show answer
- Freezing
- Melting
- Evaporation (or boiling) — correct
- Condensation
Water evaporates from a puddle; it boils when heated enough.
19. What do we call the change from gas to liquid?Show answer
- Melting
- Freezing
- Condensation — correct
- Burning
Dew on grass forms when water vapor condenses.
20. Why does ice float on water?Show answer
- Ice is colder than water
- Ice is less dense than liquid water — correct
- Ice is heavier than water
- Ice has no mass
Ice takes up more space than the same amount of liquid water, so it floats.
21. What gas do plants take in to make food?Show answer
- Oxygen
- Nitrogen
- Carbon dioxide — correct
- Helium
Plants use carbon dioxide, water, and sunlight to make sugar.
22. What gas do plants release that humans need?Show answer
- Carbon dioxide
- Oxygen — correct
- Methane
- Chlorine
Photosynthesis releases oxygen into the air.
23. What is rust mostly made from?Show answer
- Iron reacting with oxygen and water — correct
- Sugar reacting with salt
- Plastic melting
- Wood rotting only
Rust is a reddish compound that forms when iron meets air and moisture.
24. What makes bubbles in soda?Show answer
- Oxygen gas
- Carbon dioxide gas — correct
- Nitrogen liquid
- Hydrogen ice
Carbon dioxide is dissolved in soda under pressure; opening the can lets it bubble out.
25. Table salt is mostly which compound?Show answer
- Sugar
- Sodium chloride (NaCl) — correct
- Baking soda
- Vinegar
Common table salt is sodium chloride.
26. What is vinegar's main acid called?Show answer
- Citric acid
- Acetic acid — correct
- Sulfuric acid
- Hydrochloric acid
The sour taste of vinegar comes from acetic acid.
27. Baking soda can help dough rise because it releases what?Show answer
- Water
- Salt crystals
- Carbon dioxide gas — correct
- Metal flakes
When baking soda reacts in dough, gas bubbles help the dough puff up.
28. What is the smallest unit of an element that still is that element?Show answer
- A molecule
- An atom — correct
- A cell
- A grain
Atoms are the building blocks of elements.
29. What do we call two or more atoms bonded together?Show answer
- A metal
- A molecule — correct
- A mineral only
- A spark
A water molecule is two hydrogen atoms bonded to one oxygen atom.
30. An element is a substance made of only one kind of what?Show answer
- Atom — correct
- Mixture
- Flavor
- Color
Gold is an element because it is only gold atoms.
31. A compound is made when different elements…Show answer
- Stay completely separate
- Chemically bond together — correct
- Only freeze
- Only change color
Water is a compound of hydrogen and oxygen bonded together.
32. Sand mixed with iron filings is best described as a…Show answer
- Compound
- Element
- Mixture — correct
- Pure gas
In a mixture, substances are combined but not chemically bonded.
33. Which tool best separates iron filings from sand?Show answer
- A thermometer
- A magnet — correct
- A mirror
- A ruler
Iron is magnetic, so a magnet can pull the filings out of the sand.
34. Which process separates salt from salty water by heating?Show answer
- Freezing only
- Evaporation — correct
- Magnetism
- Shaking
Water evaporates and leaves the salt behind.
35. What does the pH scale help measure?Show answer
- Temperature
- How acidic or basic something is — correct
- How heavy something is
- How fast something moves
Lower pH is more acidic; higher pH is more basic (alkaline).
Chemistry Trivia Questions for Kids (with Answers)