Brain Teasers
1=1=?
Fun: (2.45)
Difficulty: (2.11)
Puzzle ID: #39051
Submitted By: AndrewWalker Corrected By: calmsavior
Submitted By: AndrewWalker Corrected By: calmsavior
Science
Science brain teasers require understanding of the physical or biological world and the laws that govern it.Science
One ml of pure water is equal to one cubic cm and is one gram. But Jonie had a sample of one ml of pure water but its mass was slightly more than a gram. How can this be?
Hint
The scale she used was accurate and she found the exact mass of the beaker then subtracted it from the total.Answer
She had heavy water. Heavy water is pure water that is slightly heavier. Normal water has two hydrogen atoms and an oxygen atom. Hydrogen has one proton and one electron, but no neutrons. Heavy water is water with at least one hydrogen atom having one neutron.Hide Hint Show Hint Hide Answer Show Answer
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Comments
Good answer, but a more common explanation would simply to have water that is cooled a little. Your density statement is only precisely true at 25 C (and 1 atm). Water that is cooled to, say, 20 C will weigh more - per cc.
(Be careful, though - as water expands again, upon cooling, as it approaches the freezing point. But not around 20 C.
See? No nuclear chemistry needed for a plausible answer/explanation.
(Be careful, though - as water expands again, upon cooling, as it approaches the freezing point. But not around 20 C.
See? No nuclear chemistry needed for a plausible answer/explanation.
Thanks for the tip. I know that at 4 deegrees celsius is when water begins to expand.
This is also my first teaser.
very cute, never heard of heavy water, i hear of hard water but never measured it nice job for your first one
Nice teaser. I knew about heavy water and figured that was what you were talking about even though you did not stipulate STP (Standard Temperature and Pressure).
@electron. At STP it would be ice.
Hahaha! Yes! I just learned about heavy water last Wednesday in Chemistry class.
Well, I still got it wrong, but still.
Well, I still got it wrong, but still.
Thanks for the tip. I know that at 4 deegrees celsius is when water begins to expand
Yes - which water... pure, impure, heavy?
Yes - which water... pure, impure, heavy?
I actually guessed both the heavy water and temperature difference options! I think they're both valid answers. For a first teaser, this is realllly good!
Heavy Water? Never heard of it. Or if I did, I forget it. I immediately thought that the water was cooled.
I assumed the cause was temperature and pressure.
Is there some amount of heavy water in all water samples? Is it naturally occurring at some parts per million, but samples can be created with increased levels of heavy hydrogen molecules? There is a lot of chemistry I just don't know.
Is there some amount of heavy water in all water samples? Is it naturally occurring at some parts per million, but samples can be created with increased levels of heavy hydrogen molecules? There is a lot of chemistry I just don't know.
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