Chemistry (Science & Mathematics) - September 2006

A student reported the following combination of unknown mixture"X": 25% NH4CL, 30% NaCl, and SiO2. Assuming these calculations are correct, explain the student's error in this experiment...

2006-09-19 10:32:25 · 4 answers · asked by hetrp 1

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How do you separate the hydrogen and the oxygen from water?

2006-09-19 10:19:59 · 4 answers · asked by lil_azn_boy_94 1

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If sand , salt , and iron are mixed together, is there a way that u can seperate them?

2006-09-19 10:17:09 · 5 answers · asked by **palestine** 1

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How can you tell a block of steel from a block of aluminum if they are painted the same color?

2006-09-19 10:13:24 · 5 answers · asked by hustlnflo 1

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Help! I have a molar mass lab due?

The formula of carbon tetrachloride is CCl_{4 (CCl4)

Question #1:How many moles of Cl would be needed to react with 2 moles of C?

Question #2: How many moles of C would be needed to react with 2 moles of Cl?}

2006-09-19 10:05:12 · 3 answers · asked by Anonymous

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Calculate the molar mass of this unknown liquid?

In the Dumas-bulb technique for determining the molar mass of an unknown liquid, you vaporize the sample of a liquid that boils below 100°C in a boiling-water bath and determine the mass of vapor required to fill the bulb. From the following data, calculate the molar mass of the unknown liquid: mass of unknown vapor, 1.413 g; volume of bulb, 481 cm3; pressure, 742 torr; temperature, 99°C.

2006-09-19 09:59:47 · 1 answers · asked by Anonymous

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what is the strongest acid in the world?

2006-09-19 09:44:55 · 8 answers · asked by Sharlene R 3

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Copper(II)sulfate+sulfuric acid mechanism?

2006-09-19 09:09:15 · 2 answers · asked by mohamed h 1

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what products are made from horses?

2006-09-19 08:19:51 · 11 answers · asked by drjulisia 1

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If the melting point of a solid, and freezing point of a liquid are the same temperature..?

Does this also mean when a metal is heated and becomes a liquid, then cools down to be a solid, this is classsed as its freezing point also.I associate freezing with being cold.

2006-09-19 07:13:41 · 11 answers · asked by anthony r 1

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if solid has a greater density than liquid,then how come a cube of ice can float on water?

the teacher gave us this question to think about till tomorow,but i couldn't think of any logical reason.Do u know the answer?

2006-09-19 07:07:38 · 26 answers · asked by Anonymous

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Is mercury (element)magnetic?

2006-09-19 06:18:25 · 5 answers · asked by Alien Anjali 2

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More Help, please!!!!!!?

CaCl2(aq) + 2 KOH(aq)Ca(OH)2(s) + 2 KCl(aq)

CaCl2 is provided in the form CaCl2·2H2O, but upon dissolving it in water, the waters of hydration can be ignored. There is a 1:1 stoichiometric relationship between CaCl2·2H2O and CaCl2.

0.392 grams of CaCl2·2H2O are combined with 0.515 grams of KOH. What is the theoretical yield of Ca(OH)2(s) in grams?

2006-09-19 05:46:25 · 3 answers · asked by Anonymous

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Do tube lights emit radiations or any radiatic sound .(Enter scientific answers)?

2006-09-19 05:40:38 · 7 answers · asked by ASH 1

Chemistry - September 2006