Chemistry - June 2007

a) remain the same
b)go down
c) go up

2007-06-28 03:24:39 · 20 answers · asked by anshudixit_2005 1

2007-06-28 03:22:06 · 11 answers · asked by jesusallaroundme 1

Is potassium carbonate a strong base or weak base? Is phospheric acid strong acid or weak acid? What indicator should I use if I want to titrate potassium carbonate with phosphoric acid for complete neutralisation? Also, what pH does that indicator change at? Any alternative indicator? It would be good if you could provide a source.

2007-06-28 01:48:11 · 4 answers · asked by 5 2

The four elements there are earth,water,fire and air.

2007-06-28 01:05:24 · 5 answers · asked by patrick evangelista 1

Apart from pure bonding between the same elements eg O-O and N-N [both sets purely covalently bonded] is it possible to have two or more different element types bonded together that are purely ionic or purely covalently bonded? if not why? Is NaCl purely an ionic bond?

2007-06-28 00:57:26 · 4 answers · asked by Gideon 1

2007-06-28 00:22:52 · 3 answers · asked by *Nikki. c: 1

B. Add the following MASSES and express the answer in GRAMS:
45.00 g, 1.0000 kg, 375 mg, 22.0 dg, 88 cg = ?????????

2007-06-27 21:42:00 · 4 answers · asked by unek 1

a) part of the solid sticks out of the water.
b) An air bubble is trapped under the solid in the water.
c)Alcohol (density= 0.79 g/ml) is substituted for water (density= 1.00 g/ml) in the cylinder in measuring the volume of an irregular solid.

2007-06-27 20:02:22 · 1 answers · asked by dk 1

which neutral atom is isoelectronic with each of the following ions:
a) N3-
b) Ba2+

2007-06-27 18:51:44 · 4 answers · asked by Marcus 1

2007-06-27 18:50:13 · 3 answers · asked by Anonymous

and explain your answer

a. C(s) + O2(g) ---> CO2(g)
b. CO(g) + 1/2O2(g) ---> CO2(g)
c. 2C(s) + 2O2(g) ---> CO2(g)
d. CaCO3(s) + CaO(s) ---> CO2(g)

help me please, i don't understand it.

thank u!

2007-06-27 17:53:52 · 2 answers · asked by Ganbatteru 3

2007-06-27 17:11:33 · 2 answers · asked by nickhil2003 2

please briefly explain why you think so?

2007-06-27 17:08:27 · 4 answers · asked by Yarka 1

My dad needs to remove oxygen from the air at a mine to prevent a potential fire. Is there anyway to do that? We thought about clorox, but I have no idea actually.

2007-06-27 16:04:10 · 3 answers · asked by austin 2

After doing a problem and finding a solution, I need to know how to tell if it is an acid or base...

2007-06-27 15:46:54 · 3 answers · asked by lovelatte57 1

You react a metal with hydrochloric acid to produce hydrogen and a metal chloride.

How can you determine the empirical formula of the metal chloride from the ratio of the mass of the metal chloride to the mass of the metal?

(The masses have been determined by experiment)

2007-06-27 14:56:13 · 1 answers · asked by Anonymous

I have two sets of reactions for the neutralization of phosphoric and citric acid...

For phosphoric acid I have:
H3PO4(aq) + NaOH(aq) -> NaH2PO4(aq) + H2O(l)
H3PO4(aq) + 2NaOH(aq) -> Na2HPO4(aq) + 2H2O(l)
H3PO4(aq) + 3NaOH(aq) -> Na3PO4(aq) + 3H2O(l)

For citric acid I have:
H3C6H5O7(aq) + NaOH(aq) -> NaC6H7O7(aq) + H2O(l)
H3C6H5O7(aq) + 2NaOH(aq) -> Na2C6H6O7(aq) + 2H2O(l)
H3C6H5O7(aq) + 3NaOH(aq) -> Na3C6H5O7(aq) + 3H2O(l)

2007-06-27 14:43:10 · 3 answers · asked by victoria 5

2007-06-27 13:50:21 · 3 answers · asked by sss n 2

2007-06-27 12:34:29 · 8 answers · asked by Anonymous

I'm a little confused. Other than one being kept in a tank and the other being piped in to the home, I thought they were the same gas. Now I'm not sure. I know that they put an additive in propane so you can smell it. Isn't that the same thing they do to natural gas?

2007-06-27 12:29:24 · 12 answers · asked by sheila10562 1

2007-06-27 12:08:10 · 1 answers · asked by Anonymous

2007-06-27 11:52:32 · 2 answers · asked by fourkoals 1

A- the formula weight of the liquid molecules
B- the shape of the liquid molecules
C- the intermolecular forces between the liquid molecules
D- none, all of the above affect the boiling point

2007-06-27 11:27:22 · 4 answers · asked by Anonymous

at any temperature the vapor pressure of chloroform is less then that of water.
chloroform is more volatile then water
both statements are true
both statements are false

2007-06-27 11:19:07 · 3 answers · asked by Anonymous

if atmospheric pressure ona certain day is 749 mm Hg, what is the partical pressure of Nitrogen, given that nitrogen is about 78% of the atmosphere?

2007-06-27 11:03:01 · 2 answers · asked by Anonymous

i know that crack is made from coke, but how is it an easier and cheaper process if it is made from cocaine? how do these two drugs differ?

2007-06-27 10:53:01 · 9 answers · asked by KevinLT 1

When mixing 40 mL of 0.1 M NH3 and 20 mL of 0.25M HCl.

I have the answer and how to do it but the way it is done is very very vague. I know in this case the acid is in excess compared to base. But would I calculate the same problem if there was excess base? What if the amounts were equal?

2007-06-27 10:49:36 · 1 answers · asked by ScienceNut 2

Calculate the ph of a solution formed by mixing 10ml of 0.1M HBr with 20ml of 0.2M HCl.

2007-06-27 10:25:33 · 2 answers · asked by G 1

1.1 x 10^-2 g of SrF2 dissolve per 100 mL of aqueous solution at 25.0 degrees C. What is the solubility product for SrF2?

2007-06-27 09:10:27 · 1 answers · asked by aimeikins711 1

How to you calculate molarity if you don't know the mass? The only information I have is How many litres of each liquid I started with.

2007-06-27 09:05:32 · 5 answers · asked by greensock 5