Here are 100+ science riddles for you to enjoy! Looking for a science related riddles challenge? Check out our collection of chemistry riddles, physics riddles, biology riddles! They'll make you think and teach you scientific riddles things. Test yourself with this 100+ science riddles with answer. Whether you love science or just want some brain-teasing fun, these riddles are perfect. Put your thinking cap on and get ready to solve the mysteries of the universe, one science riddle at a time!

Updated: 02-01-2026

Chemical formula for table salt 

17. Riddles
What is the chemical formula for table salt? 
    • The chemical formula for table salt is NaCl (sodium chloride). 

Cannot be bought at a gas station 

18. Riddles
I am a gas that is helpful to plants, but I cannot be bought at a gas station. What am I? 
    • Carbon dioxide 

I can measure heat 

19. Riddles
I am a god, a planet, and I can measure heat. What am I? 
    • Mercury 

I am a lack of space riddle 

20. Riddles
I touch your face. I am in your words. I am a lack of space and beloved by birds. What am I? 
    • Air 

Inside and outside your body riddle 

26. Riddles
I can be good for you, I can be bad, I can be found all over inside and outside your body. I am microscopic, single-celled and have no nucleus. 
    • Bacteria 

Chemical symbol for oxygen 

27. Riddles
What is the chemical symbol for oxygen? 
    • The chemical symbol for oxygen is O. 

Smallest particle of an element

28. Riddles
What is the name of the smallest particle of an element? 
    • The name of the smallest particle of an element is an atom.

Chemical symbol for calcium

30. Riddles
What is the chemical symbol for calcium? 
    • The chemical symbol for calcium is Ca.