Qualification > Sciences
CHEMISTRY PAPER 1 HERE
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--- Quote from: notty_me on June 11, 2009, 03:45:47 pm --- cn anyone plzzzz xplain da answer 2 chem ppr1 que 20 oct07????
thanx
--- End quote ---
Both, carbon and calcium react with oxygen in the air. Carbon dioxide forms in the case of carbon, which escapes as a gas, so mass decreases. Calcium oxide formed in the case of calcium, which is a solid, and so mass increases.
aquarian93:
cn anyone help me wid question 9 from oct 07?
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--- Quote from: aquarian93 on June 11, 2009, 03:57:27 pm ---cn anyone help me wid question 9 from oct 07?
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Electrolytes are either molten or aqueous. Since water is already there and you have to add something into it, the electrolyte is supposed to be aqueous. For the electrolyte to be aqueous, a soluble salt has to be added to water. That soluble salt is potassium sulfate (D)
aquarian93:
--- Quote from: i-insane on June 11, 2009, 04:03:13 pm ---
--- Quote from: aquarian93 on June 11, 2009, 03:57:27 pm ---cn anyone help me wid question 9 from oct 07?
--- End quote ---
Electrolytes are either molten or aqueous. Since water is already there and you have to add something into it, the electrolyte is supposed to be aqueous. For the electrolyte to be aqueous, a soluble salt has to be added to water. That soluble salt is potassium sulfate (D)
--- End quote ---
thanks alot :)
aquarian93:
--- Quote from: i-insane on June 11, 2009, 03:48:12 pm ---
--- Quote from: notty_me on June 11, 2009, 03:45:47 pm --- cn anyone plzzzz xplain da answer 2 chem ppr1 que 20 oct07????
thanx
--- End quote ---
Both, carbon and calcium react with oxygen in the air. Carbon dioxide forms in the case of carbon, which escapes as a gas, so mass decreases. Calcium oxide formed in the case of calcium, which is a solid, and so mass increases.
--- End quote ---
i had the same doubt, thanks once agn.
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