abdullahAK
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Hello !
Question:A compound contains one atom of calcium, two atoms of hydrogen and two atoms of oxygen.
What is the correct chemical formula of the compound?
A CaO2H2
B HOCaOH
C H2CaO2
D Ca(OH)2
Kindly anyone explain me why the answer is B when A also satisfies the statement.Help will be appreciated.
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matrix7200
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This question does not make any sense, are you sure this is the full question because all the Formula's satisfies the statement :/
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baeoftae
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I think you are looking at the wrong marking scheme, coz A is impossible, i think D is the right answer
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abdullahAK
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Why A is incorrect?
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ThunderBeard
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Maybe it's an alcohol of some sort?
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abdullahAK
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So what is the correct answer?
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entertainmyfaith
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hiya, i've moved this to chemistry for you so hopefully someone with more knowledge on this subject'll be able to help
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unibrennan988
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(Original post by abdullahAK)
Hello !
Question:A compound contains one atom of calcium, two atoms of hydrogen and two atoms of oxygen.
What is the correct chemical formula of the compound?
A CaO2H2
B HOCaOH
C H2CaO2
D Ca(OH)2
Kindly anyone explain me why the answer is B when A also satisfies the statement.Help will be appreciated.
I would have said the answer was Ca(OH)2 as this shows that the oxygen and hydrogen atoms are added as 2 x OH groups, which is probally the reason B is the answer as that also shows this in a less neat way. But A and C show that the structure will have single hydrogen and oxygen atoms, which as Ca is in the second period it cannot happen (Ca has 2 outer e- and if it were to bond covelently with 2 hydrogen atoms it would have no electrons left to bond with the oxygens so this cant happen).

So yeah, i would say B and D show the functional groups, but D would be a better way of writing the formula.
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abdullahAK
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(Original post by entertainmyfaith)
hiya, i've moved this to chemistry for you so hopefully someone with more knowledge on this subject'll be able to help
I am your grateful.
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abdullahAK
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(Original post by entertainmyfaith)
hiya, i've moved this to chemistry for you so hopefully someone with more knowledge on this subject'll be able to help
I am your grateful.
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