Chemistry - February 2007

Chem Lab question

2007-02-27 10:04:46 · 3 answers · asked by charmander 1

I read that lemon juice will alkalize the body, but it didn't say by how much?

2007-02-27 09:58:38 · 2 answers · asked by Anonymous

At the beginning of a procedure, why must the crucible be cleaned before weighing? Why must the crucible be heated and allowed to cool beofre weighing?

2007-02-27 09:50:09 · 5 answers · asked by diamond 3

When an element with 115 protons in its nucleus is synthesized, will it be a metal, nonmetal, or metalloid? EXPLAIN PLEASE!

2007-02-27 09:49:17 · 2 answers · asked by ♥Roberta. 5

Science H-W..Yes I'm an idiot

2007-02-27 09:46:30 · 2 answers · asked by lemonsandcake 3

Chem question, really confused

2007-02-27 09:37:35 · 1 answers · asked by charmander 1

I have a lot of material to cover and I am trying to figure out the best approach.

2007-02-27 09:31:51 · 3 answers · asked by fifififi2000 1

2007-02-27 09:18:14 · 5 answers · asked by Anonymous

Using Henderson-Hasselbach, calculate the pH of a solution composed of 155 mL of 0.1 M acetic acid and 45 g of sodium acetate. The pKa is 4.76.

So first I found the moles of socium acetate : 45g * 1 mol/60g = .75 mol, and then I divided that by the amount of solution:

.75 mol/ .155 L = 4.84 M

pH = pKa + log [4.84]/[0.1] = 6.44

Is this correct?

2007-02-27 09:02:42 · 1 answers · asked by Anonymous

2007-02-27 08:49:19 · 1 answers · asked by mohamed a 1

i would like a unbiased opinion please

2007-02-27 08:33:59 · 2 answers · asked by tom m 1

a. 120
B. 60
C. 180
D. 109
E. 90

please explain

2007-02-27 08:33:16 · 3 answers · asked by galdon885 1

What would happen if there were only water?

2007-02-27 08:12:18 · 4 answers · asked by SomeRandomKid 1

I sprayed my hair with apple cider vinegar, and some of it got on my shirt. Around every snap is now some kind of light blue stain--so what material in the metal creates blue when combined with apple cider vinegar?

2007-02-27 08:09:56 · 1 answers · asked by Crys H. 4

Is copper sulphate soluble?
it is not.

is copper carbonate soluble?
it is.

which acid is needed to react with copper carbonate to make copper sulphate? nitric or sulphuric?
it is sulphuric acid

How could crystals of copper sulphate be obtained from solution following the reaction?
Evaporate off the water to leave the crystals

I know all these answers however I want more detail in each in order to gain more marks. Explain each carefully and add details.

Thank You for your help.

2007-02-27 07:49:43 · 2 answers · asked by Anonymous

2007-02-27 07:36:00 · 2 answers · asked by emerald 1

So I know that the amount of particles in a solution effects both the boiling and freezing points of that solution. I also know that the more particles there are, the higher the boiling point will be. However, as the amount of particles in a solution increase, does the FREEZING point increase or decrease? I thought it was decrease, but I need to make sure...

2007-02-27 07:24:30 · 4 answers · asked by Sarah 3

2007-02-27 07:18:52 · 2 answers · asked by Anonymous

At 298 K, the K2 is 1 x 10^-14 M, while at 373 K, the Kw is 51 x 10^-14, Is the reaction exothermic or endothermic? Explain your answer.


I want to say endothermic because the concentration is higher, but I'm not sure.

Am I right or wrong?

2007-02-27 07:06:33 · 2 answers · asked by Anonymous

2007-02-27 07:04:15 · 5 answers · asked by Jonathan B 1

A solution with a total volume of 500.0 ml is prepared by diluting 45 ml of glacial acetic acid with water. Calculate the [H+] and the ph of this solution. Assume that glacial acetic acid is pure liquid acetic acid with density of 1.05 g/ml.

How do I manipulate density to get molarity?

2007-02-27 06:30:37 · 1 answers · asked by mandarth1 1

How do I determine it from only the formula and no ph or concentrations?

2007-02-27 06:26:49 · 4 answers · asked by mandarth1 1

2007-02-27 06:10:02 · 1 answers · asked by Rita C 2

What makes it come out of the can?

2007-02-27 06:06:03 · 1 answers · asked by travis b 1

2007-02-27 05:46:18 · 2 answers · asked by cnagreys4me 2

i need to find out the heat retension and the conductivity of the raw materials to compare the to stainless steel skillets. This is for chemistry class.

2007-02-27 05:43:07 · 2 answers · asked by Ashley J 1

I am needing this information for chemistry. I need to compare the conductivity and heat retension of a stainless steel skillet to that of a cast iron skillet.

2007-02-27 05:38:58 · 6 answers · asked by Ashley J 1

A) V^3+
B)Cd^2+
C)Co^3+
D)Ag^+

I dont understand which ones are paramagnetic?

2007-02-27 05:38:49 · 1 answers · asked by Rita C 2

I dont understand how you come up with calculations to do dilutions. The problem i'm given is that the stock solution of bromothymol blue is 15 ppm. It says to set up a dilution scheme and use it to produce samples of different concentrations (0, 1, 2, 5, 10, and 15).Then i measure the absorbance with the spectrophotometer,e tc. Thank you for any help!

2007-02-27 05:34:24 · 1 answers · asked by Anonymous

2007-02-27 05:23:00 · 5 answers · asked by Anonymous