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Chemistry P1 and P2 today

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What about bonding? The thing is, i can't figure out whether I've forgotten the question, or I accidentally left the question and screwed my paper up. :(

Why does Magnesium Oxide have a higher boiling point then Sodium Chloride? This was the first part.
 
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Temper temper. Everyone loses marks, I've lost many as well, that doesn't mean I go crazy and start abusing.
I don't know what you're saying. Please tell me the method you used and the answers you got.


Mr of Calcium Carbonate divided by Mr of Calcium Carbonate + Mr of Magnesium Hydroxide x Mass of tablet.

^ Given in our book. Used in past papers.
 
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The 2 compounds were UREA and AMMONIUM NITRATE,
(NH2)2CO and NH3NO3, I calculated the Mr's and then used 28/Mr to find the % composition.
Ohkk... but that was applicable on the 1st part if i remember correctly.... u can't calculate moles from it coz its the % of the mass.... not the true mass.... can u???:confused:
 
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Mr of Calcium Carbonate divided by Mr of Calcium Carbonate + Mr of Magnesium Hydroxide x Mass of tablet.

^ Given in our book. Used in past papers.

The mass of calcium carbonate was 0.232 g. What was the mass of the tablet?
 
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