Without this, H2O would just be 2O.

Riddle: I may have twice the life-giving gas but I do not give life to you. However, without me, you will never have food. What am I?

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Answer: Carbon Dioxide.

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Rating: 100%

Riddle: Why did Carbon marry Hydrogen?

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Answer: They bonded well from the minute they met.

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Rating: 60%

Riddle: Why can't you trust an atom?

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Answer: They make up everything.

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Rating: 100%

Riddle: I am essential to life on earth! I am split into thirds. Two thirds are the same. One of the thirds is 8. The other two are 1 each. What am I?

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Answer: Water

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Rating: 100%

Riddle: I catch fire easily but I protect cars in the cold. You can use me as a fuel and yet I am every distiller’s goal. What am I?

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Answer: Ethanol

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Rating: 67%

Riddle: Kids really love me because I make things float. You can even use me to expand small things. What am I?

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Answer: Helium

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Rating: 100%