Chemistry - November 2007

1. Which two substances can not be broken down by chemical change?
(1) C and CuO (3) CO2 and CuO
(2) C and Cu (4) CO2 and Cu

2007-11-29 09:58:09 · 2 answers · asked by Anonymous

could anyone tell me how to solve the following problem?

A metal undergoes electrolytic reduction according to
ne- + Mn+ ===> M. What current (in Ampères) must be provided to deposit the metal at a rate of 1.801 mol/hr if n = 1?

2007-11-29 09:57:49 · 1 answers · asked by Nickname 1

2007-11-29 09:56:08 · 2 answers · asked by Raven 2

What is the conjugate acid of NH2- ?


What is the conjugate base of H2SO4?


How do I determine this?

2007-11-29 09:48:50 · 2 answers · asked by chosen one 3

I am doing a scavenger hunt for my IPC class, and I cant find these last few questions. If you can help please do!
(for the examples, it would be great if they were easy to find in any house hold!) thanks to anyone who replies!

1) What is an example of a sweet substance containing a covalent bond?
2) What is an example of a substance with the ability to form iron oxide?
3) What is a sample of a Inert gas?

2007-11-29 09:38:02 · 5 answers · asked by Anonymous

Science hw

2007-11-29 09:09:17 · 5 answers · asked by ☼Daisies☼ 2

what is the balanced total ionic and net ionic equations for the reaction of Zn(s) + 2HCl(aq) yeilds H2(g) + ZnCl2(aq)

2007-11-29 08:43:58 · 1 answers · asked by bldeitz 1

2007-11-29 08:11:03 · 1 answers · asked by Anonymous

1. If sulfuric acid reacts with 30.0g of sodium chloride, how many grams of hydrochloric acid are produced?

2. If ammonium sulfate reacts with 20.0g of calcium hydroxide, how many grams of ammonium hydroxide are produced?

3. How many liters of oxygen gas are required to react with 84.9g of carbon to produce carbon dioxide?

2007-11-29 07:41:47 · 1 answers · asked by (: Muffin Man :) 2

Identify the limiting reactant when 7.81g HCl reacts with 5.24g of NaOH to produce NaCl and H2O.

please go through all of the steps

2007-11-29 07:40:19 · 2 answers · asked by shelbers_rawrrr 2

What five-carbon sugar is found in DNA?

2007-11-29 07:37:40 · 4 answers · asked by Anonymous

2007-11-29 07:33:46 · 2 answers · asked by bldeitz 1

triglyceride

cellulose

enzyme

DNA

2007-11-29 07:31:57 · 4 answers · asked by Anonymous

The cup is a volume measure widely used by cooks in the US. One cup is equivalent to 237mL. If 1 cup of olive oil has a mass of 205g, what is the density of the oil(in g/cm)?

2007-11-29 07:22:43 · 2 answers · asked by young_buck_gurl 2

Can you give your reasoning for each one and put them in order of strength.

2007-11-29 07:17:48 · 2 answers · asked by Anonymous

Identify the limiting reactant when 5.87g of Mg(OH)2* reacts with 12.84g of HCl to form MgCl2* and water.

* the star after the 2 means it's a subscript

please help i don't get this stuff at all!

2007-11-29 07:05:38 · 5 answers · asked by shelbers_rawrrr 2

Okay, so I'm in Chemistry I in college. I didn't have a good high school experience with chem, so it's biting me in the bum now.

I'm having the hardest time setting up the problems. I get how to do some of the calculations, but when I get a problem on a test, I can't pick out what information to plug in where. Here's one of the MANY questions I'm having a problem with:

"You have a 5.00 L solution of silver (I) nitrate. Suppose you want to convert the silver ions to silver metal. To do so, you will add zinc metal to reduce the silver ions. You first take a 3.00 mL sample of the silver (I) nitrate solution and find that it takes 20.0 mg of zinc metal to convert all of the silver ions in the sample to silver metal. What is the concentration of silver (I) nitrate? How much zinc (in grams) will be necessary to convert all of the silver ions in the 5.00 L solution to silver metal?"

I get that I need to find the molarity, but my book doesn't have problems similar to this.

2007-11-29 06:46:00 · 1 answers · asked by qpxandrad 4

Which of the following Lewis acid-base reactions are not Bronsted acid-base reactions ?

a) Ag +(aq) + 2CN -(aq) = Ag(CN)2 -(aq)
b) HNO3(aq) + NaOH --> NaNO3(aq) + H2O(l)
c) Al(OH)3(s) + OH-(aq) --> Al(OH)4-(aq)
d) BF3(g) + (CH3CH2)2O(l) --> (CH3CH2)2OBF3(l)

2007-11-29 05:14:51 · 2 answers · asked by idonohw5 1

I have a test monday and Im having a lot of trouble....can you tell me whatever you can about the similarity of reactivity between alkenes and alkynes

2007-11-29 03:59:02 · 2 answers · asked by Me 3

Could someone please help me step-by-step through this sort of problem? I'm having trouble wraping my head around it.

Here's an example:
A 0.35 M solution of an unknown weak base has a pOH of 5.75. Calculate the Kb.

2007-11-29 03:41:42 · 2 answers · asked by Anonymous

HCl + CaCO3 ---->
HCl + NaHCO3---->
HCl + KHCO3---->
I guess I am confused, because I believe water should be a product. Is there more than two products in some of these equations? I am so confused.

2007-11-29 03:34:28 · 6 answers · asked by cdavis337 2

How many air molecules are in a 12x12x10 ft room? Atmospheric pressure is 1 atm and room temperature is 20. C. Assume ideal behavior.

2007-11-29 03:33:42 · 1 answers · asked by princess_be 1

I need someone to explain what it is if there a formula (if so I need it) and how it relates to Ideal gas law! Thanks a million its for a project.

2007-11-29 03:26:14 · 1 answers · asked by kittycats_legacy 1

Yellow sold burns in oxygen with a bright blue flame, producing a misty gas. Gas is soluble in water, and the solution turns indicator red.
What is the solid?
What is the gas created?
Thanks soo much - I have no idea :S
x

2007-11-29 03:20:45 · 2 answers · asked by Anonymous

I TRIED SOLVING IT BUT I DONT KNOW IF AM RIGHT

Ca (OH) 2 (S) + HNO3 (aq)>>>>> 2H2O (l) + Ca (NO3)2 (aq)

Ca (OH) 2 (S)=-986.1 kj/mole
+
2HNO3 (aq) = -414.8 kj/mole
= -1400.9 kj/mole

2H2O (l)= 571.6 kj/mole
+
Ca (NO3)2 (aq) = -938.4 kj/mole
=-1510

-1510-(-1400.9)= -109.1




the mole for Ca(OH)2 (s)= .2985450115

and the moles for HNO3=2.1376

2007-11-29 01:41:44 · 1 answers · asked by io 1

why on most of batteries it's written that no mercurey is added?what are the harms of adding mercurey?does it increase the batteries life?

2007-11-29 01:20:56 · 3 answers · asked by Abdullah 2

I was trying to draw a electronic diagram of SO3. S, which has bonded with 3 O, got 9 electrons in its outermost shell. So, would it transfer a electron to the O which need it? Also, should I fill the atom with a higher ability to gain electrons first? Like N and O, they are in the same period, but O have more protons, so I need to fill O to 8 electrons first and the N gain 1 from other particle and form a polyatomic ion with a charge of 1-. Am I right?

2007-11-28 23:23:29 · 1 answers · asked by Anonymous

I can't seem to find any kind of formula anywhere. all i got is that its made up of water, casein, fat, etc... if anyone knows a possible formula for any type of milk, it would really help me (by the way its an independent assignment for school). Any formula will be fine with me

2007-11-28 23:10:30 · 2 answers · asked by The Gildclam 2

please let me know yar.........

2007-11-28 23:10:17 · 3 answers · asked by Anonymous

Hi all,
I want know details about Silica Gel. What is raw material, production process, what are the type of silica gel etc., Could anyone help me. Thanks in advance. Renga

2007-11-28 23:10:13 · 6 answers · asked by Renga N 1