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Topic: Atoms and molecules  (Read 3537 times)

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Offline tobycat2

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Atoms and molecules
« on: August 24, 2010, 10:49:34 PM »
Simple question here, but it's a review question on a worksheet and I'm wondering if there is a trick to it since it seems obvious.

The question is: If you had 10 Cl atoms and 10 K atoms, how many molecules would form? At first thought I assumed he wanted us to just fill out the electron shell of Cl, sharing with K, until we ran out of atoms, thus giving us 2 molecules.

For some reason bohr shell model, balancing chem. equations, etc were fine for me but this just seemed worded funny.

Thanks for any help. First year chem student, e. science major

Offline opti384

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Re: Atoms and molecules
« Reply #1 on: August 24, 2010, 10:54:21 PM »
What will be formed from K and Cl?

Offline tobycat2

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Re: Atoms and molecules
« Reply #2 on: August 24, 2010, 10:59:29 PM »
potassium chloride, which is just KCl

Offline opti384

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Re: Atoms and molecules
« Reply #3 on: August 24, 2010, 11:04:19 PM »
How many number of atoms of K and Cl is required to form one molecule of KCl?

Offline tobycat2

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Re: Atoms and molecules
« Reply #4 on: August 24, 2010, 11:41:49 PM »
I'm thinking a compound like H2O has three atoms, so wouldn't KCL just have two atoms? But that doesn't seem like what he's asking...

Offline opti384

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Re: Atoms and molecules
« Reply #5 on: August 24, 2010, 11:53:56 PM »
At first thought I assumed he wanted us to just fill out the electron shell of Cl, sharing with K, until we ran out of atoms, thus giving us 2 molecules.

Then how much molecules of KCl can be formed from 10 K atoms and 10 Cl atoms?
I think you are misunderstanding something as you came up with the conclusion: 2 molecules

Offline tobycat2

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Re: Atoms and molecules
« Reply #6 on: August 25, 2010, 12:12:48 AM »
definitely.

The next question asks about 10 Be atoms and 10 Cl atoms, and then goes on to ask how many atoms (and which ones) would be left over.

Offline opti384

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Re: Atoms and molecules
« Reply #7 on: August 25, 2010, 12:58:45 AM »
Well it seems the objective is to check whether you know the ionic bonding or not. You can take the same step with Be and Cl as well.

Offline Borek

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Re: Atoms and molecules
« Reply #8 on: August 25, 2010, 02:54:26 AM »
More like aiming at limiting reagents.
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