Chemistry - March 2007

...And if this step is endothermic, then is it true that the substance will be soluble in water? Is it true that its solubulity will increase as the temperature decreases? Or, will the substance be insoluble in water (or even insoluble in all solvents)?

2007-03-13 12:52:05 · 3 answers · asked by Random G 3

2007-03-13 12:51:09 · 7 answers · asked by Anonymous

Assume there are 2 identical rubber rafts at the same temperature, inflated to exactly the same volume. One was filled with an air compressor and contains mostly N2. The other was inflated with the use of a container of compressed Carbon dioxide (CO2). Both have a pinhole leak of the same size. Which raft will deflate faster?

2007-03-13 12:49:36 · 1 answers · asked by San Fran Kid 2

THERE ARE SO MANY DIFFERENT TYPES OF METHODS AND I HAVE TO KNOW WHICH METHOD WILL BE EFFECTIVE.PLEASE HELP ME

2007-03-13 12:43:37 · 3 answers · asked by Anonymous

Yet again another chem. project question!

2007-03-13 12:42:25 · 3 answers · asked by Anonymous

chem. project!

2007-03-13 12:41:05 · 1 answers · asked by Anonymous

2007-03-13 12:37:41 · 1 answers · asked by kohlirosy 1

its for a chemistry project... we have to find a product and try to make it better... me and a friend are using hydrogen proxide...


thanks for your help!!1

2007-03-13 12:35:33 · 2 answers · asked by Anonymous

Given:
Hg2+ + Zn ---> Zn2+ + Hg
E=.85 V Hg2+ + 2e- ---> Hg
E=-.76V Zn2+ + 2e- ---> Zn
With the above cell potentials at 298K, what is the approximate equilibrium constant for the above reaction?

2007-03-13 12:34:42 · 4 answers · asked by mistermonstermoo 1

Which of the following are true statements for the given compound in aqueous solution ?



a) HBr : A Bronsted acid and a Lewis acid

b) HCN : A Lewis acid, but not a Bronsted acid

c) CH3CH2CH2COOH : A Bronsted acid and a Lewis acid

d) Ni 2+(aq) : A Bronsted acid, but not a Lewis acid

e) CH3CH2CH2CH3 : Neutral, not an acid or base of any kind

2007-03-13 12:30:42 · 1 answers · asked by sera 1

2007-03-13 12:23:52 · 2 answers · asked by ♥ 6

Which of the following are true statements for the given compound in aqueous solution ? *there can be more than one answer.



a) Cl - : A Lewis base, but not a Bronsted base

b) F - : A Bronsted base and a Lewis base

c) CH3COOH : A Bronsted acid, but not a Lewis acid

d) Cr 3+(aq) : A Lewis acid, but not a Bronsted acid

e) CH3CH2CH2CH3 : Both a Bronsted acid and a Lewis acid

2007-03-13 12:17:31 · 1 answers · asked by geebgeebgeeb 1

Calculate the pH of a 0.430 M solution of NH4I

2007-03-13 12:15:25 · 1 answers · asked by geebgeebgeeb 1

is it possible to MAKE baking soda SOLUTION. Because im not even sure about what it is. Someone told me that its just baking soda and water? i need help!! its sooo urgent. THANX <3

2007-03-13 12:14:58 · 1 answers · asked by crzynezzluv 1

electrical energy can be changed into what in any device that uses a motor?

2007-03-13 12:10:55 · 1 answers · asked by Anonymous

2007-03-13 12:09:00 · 2 answers · asked by sikhism4life88 1

A wet cell generally consists of plates of two different materials that are placed in a saline or acid solution. When these plates are linked together by a(n)______,chemical reactions between them and the solution cause electrons to move.

These chemical reactions cause electrons to move onto one plate and ______the other.

The crowding of electrons on one plate and a lack of electrons on the other produces a(n)_________

Cells containing a moist conducting paste are called dry cells.They are called dry cells because the paste is not a(n)______

In dry cells, the plates may take the form of rods,_______, or cans.

2007-03-13 12:07:15 · 1 answers · asked by Anonymous

Is benzene (C6H6) an acid, base, or neutral?

2007-03-13 12:05:18 · 6 answers · asked by Anonymous

for this chemical reaction
Aluminum reacts with aqueous hydrochloric acid to form hydrogen gas and aqueous aluminum chloride.

2007-03-13 11:59:59 · 4 answers · asked by ceomillionman 1

2007-03-13 11:57:27 · 4 answers · asked by kohlirosy 1

please fill in the blank (with the CORRECT answer!)

A current that changes direction is called a(n)_______current.

2007-03-13 11:52:21 · 4 answers · asked by Anonymous

2007-03-13 11:45:58 · 1 answers · asked by Gideon 1

Explain, and show balanced equation.

Ni + AuBr3---->NiBr2 + Au (original)
3Ni + 2AuBr3 ---> 3NiBr(subscript2)2Au (balanced)

Thanks!!! ^.^

2007-03-13 11:45:04 · 2 answers · asked by Bridget 2

A wet cell generally consists of plates of two different materials that are placed in a saline or acid solution. When these plates are linked together by a(n)______,chemical reactions between them and the solution cause electrons to move.

These chemical reactions cause electrons to move onto one plate and ______the other.

The crowding of electrons on one plate and a lack of electrons on the other produces a(n)_________

Cells containing a moist conducting paste are called dry cells.They are called dry cells because the paste is not a(n)______

In dry cells, the plates may take the form of rods,_______, or cans.

Thank you!

2007-03-13 11:43:33 · 1 answers · asked by Anonymous

Say a gas sample is occupying 300 cm3 is moved to a container that with a volume of 200 cm3. What changes would happen to the following values?
a. average kinetic energy of the gas molecules
b. the pressure of the gas
c. the average speed of the gas molecules
d. the number of collisions of a gas molecule with another gas molecule

2007-03-13 11:42:17 · 3 answers · asked by San Fran Kid 2

thankyou

2007-03-13 11:34:07 · 6 answers · asked by Blesson 2

this isn't all my schoolwork, this is barely any of it, but i can't find the answers, so i was wondering if someone could help me.

What are Wet Cells and Dry Cells?
1.A device that produces a current in solution is a(n)________
2.A wet cell produces current that consists of charged particles that always continue to move in the _________
3.The current from a wet cell is called a(n)_______
4.A wet cell generally consists of plates of two different materieals that are placed in a(n)______solution.


Thank you!

2007-03-13 11:31:09 · 5 answers · asked by Anonymous

Butanoic anhydrite

2007-03-13 11:23:28 · 1 answers · asked by Joella P 1

Okay, I basically just need to know how I'm supposed to do this type of problem.

Instructions: Write the equilibrium constant expression for the following reactions, then calculate the value Q and predict how the reaction will proceed with the given information.

Sample Problem:
At 740 degrees celcius, Keq = 0.0060 for the decomposition reaction: CaCO3 (s) (double arrow) CaO (s) + CO2 (g), where [CO2] = 0.0004 M.

I know how to do the constant expression, but how do I calculate for Q? (I don't even know what Q is...) If you could just show me how I should start this, I would be grateful.

2007-03-13 11:14:43 · 1 answers · asked by Needanswers 2

please, help me to understand this question.

Which one of the following would most effectively be stabilized by aromatic character due to electron delocalization?

is it here asking me, which one of the answers is not aromatic?

thanx

2007-03-13 11:08:57 · 1 answers · asked by Tommy 2