Which are the four most abundant elements in human body?

Hydrogen, phosphorus, sulfur, iron

Oxygen, carbon, hydrogen, nitrogen

Aluminum, silicon, oxygen, hydrogen

Ok, here it comes… The reason ice floats is because...

... it’s more dense than liquid water.

... it takes less space than liquid water.

... it’s less dense than liquid water.

... it weighs more than liquid water.

15 questions chemistry QUIZ. 88% of adults can't pass it

15 questions chemistry QUIZ. Chemistry can be unpredictable business. Would you dare to take this quiz anyway? There are 15 questions and only the smartest ones will get all of the points. A little riddle awaits for you in question no. 11. Are you ready to take this challenge? Go for it!