Chemistry - December 2007

please help in solving..

>How many milligrams of NaHCO3 are in a 500mg tablet if 40.00ml of 0.120M HCL is required to neutralize the sample?

>How many milliliters of 0.250M KOH will react with 15.0ml of 0.350M H2SO4?

*all the numbers in the chemical formulas are subscripts

THANKS!!! =D

2007-12-16 21:12:14 · 1 answers · asked by bluespark 2

How would I equate the ff inc. their products:

1) KHP(aq) + NaOH -->
2) CH3COOH(aq) + NaOH -->
3) H2CO3(aq) + NaOH -->

*all numbers above are subscripts

Thank you very much!!

2007-12-16 21:04:04 · 1 answers · asked by bluespark 2

In group IV, the upper elements, carbon can form a giant covalent structure with pure carbon. Under carbon, silicon can form a giant covalent structure with oxygen. Under it, metals come out and they can only form metallic bond.
It is non-metal----> metalloid----> metal when down a group.
I think that metals are metals not because they are metals. But they got the properties of metals. That means they got the properties of metals first, so people classify them into metal. And I think non-metal and metalloid are the same.
What I want to ask is elements in same group, got the same number of outermost shell electrons, but why their properties change down a group? From non-metal to metal. Why elements in the upper of group IV covalent bond together but elements under them become metallic bond? What cause this?
Last, only group IV can form giant covalent structure, so there would be giant covalent structure form by carbon and silicon only, right?

2007-12-16 19:50:37 · 4 answers · asked by Anonymous

If you made ice out of "heavy water" how would it differ from regular ice?

2007-12-16 19:49:28 · 3 answers · asked by ? 4

2007-12-16 18:48:48 · 6 answers · asked by mit 1

Ksp = 7.9 x 10^-27

Cadmium(II) hydroxide is added to a one liter solution that has sodium hydroxide, and thus a pH of 12 (so obviously pOH=2).

what is the approximate molar concentration of cadmium ions in this solution?

2007-12-16 17:10:46 · 1 answers · asked by Sage 1

What are the ratios for the following?

1)water to manganeese(II) chloride in the reaction: HCl + MnO2 ==> H2O + MnCl2 + Cl2
2)copper to iron in the reaction: Fe + CuSO4 ==> FeSO4 + Cu
3)iron to carbon dioxide in the reaction: Fe2O3 + CO ==> Fe + CO2
4)sodium to oxygen in the reaction: Na + O2 ==> Na2O

2007-12-16 16:58:37 · 3 answers · asked by mrxxbrian 2

Could someone please help me with this problem, as I do not understand it. Here it is,

2NH4NO3 --------> 2N2 + 4H2O + O2

What is the total number of liters of gas formed when 228 G NH4NO3 is decomposed? (Assume STP.)

2007-12-16 16:44:01 · 5 answers · asked by Anonymous

The answer key says 6.43 x 10^23 atoms but I keep getting 8.29 x10^23, am i doing anything wrong here?

2007-12-16 16:43:02 · 3 answers · asked by fallingout13 2

a scientist uses a ruler and take these measurements of the length of a desk: 10.8, 11.0, 10.9, 10.9 and 11.2. but the actual length of the table is 12.2. Are these measurement accurate or precise? Why?

2007-12-16 16:21:44 · 5 answers · asked by muzuizui 2

2007-12-16 14:59:21 · 6 answers · asked by c-monsta 1

both at 0 Celcius. The reaction is 2Na (s) + 2H2O(l) yields 2NaOH(aq) + H2(g) Triangle H = -368 kJ

Will the ice melt?Assuming that the final mixture has a specific heat capacity of 4.18 J/g x Celcius calculate the final temperature. the enthalpy fusion of ice is 6.02 Kj/mol

2007-12-16 14:34:39 · 2 answers · asked by Anonymous

2007-12-16 12:23:27 · 8 answers · asked by *click* 3

Is aspartame a monosaccharide, disaccharide, or polysaccharide?

Same goes for saccharine and sucralose.

2007-12-16 12:11:06 · 3 answers · asked by rosie 2

2007-12-16 12:06:19 · 4 answers · asked by snoop d 2

2007-12-16 11:39:36 · 2 answers · asked by snoop d 2

2007-12-16 10:43:32 · 2 answers · asked by 928c8s 1

Calcium Oxide + Water -------> Calcium Hydroxide

formula: Ca O + H20 -----> Ca OH2

2007-12-16 10:38:50 · 9 answers · asked by anon reigns 3

because i can't find one

2007-12-16 10:07:33 · 4 answers · asked by Lorraine 2

Little detail please

2007-12-16 09:48:45 · 4 answers · asked by Baller 2

2007-12-16 09:38:34 · 2 answers · asked by ~USA~ 2

What is the base in chemistry

2007-12-16 09:24:48 · 3 answers · asked by Anonymous

2007-12-16 09:24:00 · 8 answers · asked by strawberry 1

1.) p subshells
2.) d subshells
3.) s subshells
4.) f subshells

2007-12-16 09:23:16 · 2 answers · asked by ANGERST T 1

Whats the chemical formula for the compound

cobalt (III) oxide

AND

tin (II) phosphate

2007-12-16 09:07:12 · 2 answers · asked by CT 3

If the detergent requires using 0.63 kg detergent per load of laundry, determine what percentage (by mass) of the detergent should be sodium carbonate in order to completely precipitate all of the calcium and magnesium ions in an average load of laundry water.
Sodium carbonate is often added to laundry detergents to soften hard water and make the detergent more effective. Suppose that a particular detergent mixture is designed to soften hard water that is 3.3×10^−3 in Ca+2 and 1.0×10^-3 M in Mg 2+ and that the average capacity of a washing machine is 20.0 gallons of water.

2007-12-16 09:05:30 · 2 answers · asked by Anonymous

2007-12-16 09:01:08 · 9 answers · asked by rodneyallen2004 1

The mass of an average blueberry is 0.75g and the mass of an automobile is 2200 kg.

2007-12-16 08:58:45 · 2 answers · asked by Anonymous

a simple answer for this question that i just cant seem to word would be helpful :)

2007-12-16 08:50:50 · 3 answers · asked by Anonymous

2007-12-16 08:49:17 · 8 answers · asked by crazinati91 1