Chemistry - July 2007

2007-07-31 23:56:45 · 6 answers · asked by mdriz_n 1

Write a balanced equation for the neutralization of NaOH(aq) by HCl(aq) and state whether the reaction is endothermic or exothermic.

2007-07-31 21:59:09 · 7 answers · asked by David N 1

2007-07-31 21:57:49 · 2 answers · asked by Anonymous

2007-07-31 21:53:46 · 5 answers · asked by Anonymous

With what kind of substance can I write on a piece of paper in order to make the words disappear at heat?

2007-07-31 21:50:52 · 2 answers · asked by Gabriela P 1

Word equations would be best!

2007-07-31 19:42:29 · 9 answers · asked by sunshine5683 1

How many milliliters of .0215 M NaOH solution are needed to completely neutralize 2.50 mL of .0825 M H2SO4 solution?

2007-07-31 17:29:52 · 5 answers · asked by Anonymous

The volume of a 10.0% glucose solution is 8.25 mL. Its density is 1.039 g/mL. What mass does the solution have?

2007-07-31 17:28:49 · 5 answers · asked by Kristin R 2

How would I go about finding the ratios between these 3 different types of Kinetic energy--

Rotational
Translational
Intermolecular

I'm sure it has to do with the moment of inertia, mass and molecular bond, but only being through Chem112 i am not sure where to start. I am just looking for the 5% ballpark. Are there any assumptions I need to make.

Anything helps, Thanks a Bunch

2007-07-31 17:26:45 · 1 answers · asked by ericnutsch 5

why doesnt the dilution of the buffer (NaOH and acetic acid) not change the pH of the buffer by very much..why not?

why isnt deionized water not likely to have a pH of 7 ?

compare the change in pH with the addition of acid and base to deionized water and to your buffer. explain the difference

2007-07-31 16:58:33 · 3 answers · asked by Sean H 1

The density of pure aluminium calculated from crystallographic data is expected to be 2.6995g/cm³. (can consider density only)

Design an aluminium alloy that has a density of 2.6450g/cm³

and antoher aluminium alloy that has density of 2.7450g/cm³

I'm sort of lost with this question, if someone can help me with the first one and maybe put me on the right track with some formulas or links or what ever. Am i going to have to use trial and error or is there an exact way to do this. Any idea;s would be great!

2007-07-31 13:24:02 · 2 answers · asked by chinsta... 2

2007-07-31 12:36:05 · 2 answers · asked by BenL 2

What is the hydroxide ion concentration in an aqueous solution if the hydronium ion concentration is 1 x 10^-5 mole per liter? What is the pH of the solution?

Any help would be greatly appreciated

2007-07-31 12:32:15 · 5 answers · asked by Michael S 1

How many atoms are there in 56 grams of Nitrogen?

2007-07-31 12:11:28 · 2 answers · asked by zade 1

I drove into something and this morning I found my tire had a hole and it was all mushy. Was this an acid or what? Or did I piss off an alien?

2007-07-31 12:10:54 · 3 answers · asked by Anonymous

moles reacted in the reaction Zn + CuSO4 *5H2O

i don't really know which info to use, so here's all of it!

total amount of heat produced: 4.37x10^3 kj

undissolved metal: 0.10 mol. heat absorbed by undissolved metal: 24.75 kj
change in temperature: 9.9 degrees Celcius.

How do i do this? Do i need more information?

2007-07-31 11:37:27 · 1 answers · asked by Anonymous

2007-07-31 10:47:16 · 4 answers · asked by j-man 1

This question is just a 1 or 2 word answer, and I'm confused whether it's a trick question or not.

Which type of formula, empirical or molecular, can be obtained from elemental analysis that gives percent composition?

I saw an example in my textbook that shown me how to get the empirical formula from the percent composition, and from that answer, it was able to obtain the molecular formula. So what's the answer? It says "or" in the question, but then again, it might be a trick question.

2007-07-31 10:40:46 · 5 answers · asked by Andrew 2

Pretty much what the question asks, my chemistry book doesn't explain it and I want to know WHY.

2007-07-31 10:05:01 · 1 answers · asked by floridaguy 1

the molaroty on NaCl in 6.25M. The density of the solution is 1.34g/ml or kg/l. Calculate the Molality

The molality of NaCl is 0.125m, the density of the solution is 1.08g/ml or kg/l. Calculate the molarity

2007-07-31 09:29:25 · 1 answers · asked by ... 3

if you put a hot drink in a thermos flask it keeps it hot - if you put a cold drink in in keeps it cold. How does it know whether it has to keep something hot or whether it should keep it cold? also can you buy separate thermos flasks - one that only keeps things hot and one that only keeps things cold - to avoid any confusion?

2007-07-31 09:22:00 · 7 answers · asked by Anonymous

a. o-dimethylbenzene
b. m-dimethylbenzene
c. p-dimethylbenzene
d. all of the above

2007-07-31 08:13:17 · 3 answers · asked by dave b 2

a. 4
b. 5
c. 6
d. 7

2007-07-31 08:11:38 · 2 answers · asked by dave b 2

a. [6]-annulene
b. [14]-annulene
c. [16]-annulene
d. [18]-annulene

2007-07-31 08:10:44 · 4 answers · asked by dave b 2

Consider the conversion of 1-butanol to each of the compounds shown below. In which conversion is an oxidizing agent needed?

1) CH3CH2CH=CH2
2) CH3CH2CH2CH2Br
3) (CH3CH2CH2CH2)2O here the last atom is oxygen. not 20
4) CH3CH2CH2CH=O

2007-07-31 08:07:36 · 2 answers · asked by Anonymous

2007-07-31 07:58:39 · 3 answers · asked by zoow98 2

Which of the reactants is the acid and which is the base in the the following reactions
1. HCI + NaOH ---> NaCL + H20
2. HSO4 + H20 ---> OH + H2SO4

2007-07-31 07:36:40 · 4 answers · asked by Michael S 1

compare and contrast them?

2007-07-31 07:29:41 · 1 answers · asked by ♥hollyboll♥ 4

what are the structures of cis- 1,4 -dimethylcyclohexanol and trans- 1,4 -dimethylcyclohexanol.

Please draw them. or show me the link to where I get this answer.

2007-07-31 07:26:30 · 2 answers · asked by Anonymous

How many seconds does it take to deposit 1.89 g Ni on a decorative drawer handle when 10.4 A is passed through a Ni(NO3)2 solution?

2007-07-31 07:20:28 · 3 answers · asked by Sandesh R 1