Chemistry - April 2007

2007-04-09 16:17:36 · 1 answers · asked by jessica m 1

2007-04-09 16:03:57 · 2 answers · asked by jpw0248 1

I need help finding the equation for this reaction:
Ni2+(aq) + CH3C(=NOH)C(=NOH)CH3 yields.

Also I am having trouble with this equation:
Mn2+(aq) + H2O2(aq) + OH-(aq) yields.

I never know how to determine which elements go along with what. Is there a way to determine this?

2007-04-09 15:40:28 · 1 answers · asked by Jessica J 1

a solution of sodium nitrate has a concentration of 0.733 M and a density of 1.0392 g/mL

A) write the molarity as a fraction(moles/liters solution)

B) rearrange the molarity equation and solve for volume

C) find the mass of the moles of sodium nitrate







help??

thanks

<3

2007-04-09 15:40:21 · 2 answers · asked by lalagurl94 1

What is the atomic radius, in angstroms, of nickel?

Atomic weight of Nickel = 58.71 g/mol

2007-04-09 15:38:35 · 1 answers · asked by Anonymous

Can someone help me with this question:

IUPAC Name(s) or structures for cycloalkenes that can produce methylcyclopentane in the presense of Pd Catalyst.

Thank you so much

2007-04-09 15:36:44 · 2 answers · asked by sherzaman 1

whats the best way to practice reaction prediction and are there any websites with reaction prediction problems and solutions?

thanks

2007-04-09 15:32:10 · 1 answers · asked by Anonymous

2007-04-09 15:31:39 · 4 answers · asked by kkearney12iu 2

what is 121 degrees celieus at farenheit
needhelp with science project

2007-04-09 15:29:18 · 7 answers · asked by Steve 1

2007-04-09 15:21:26 · 2 answers · asked by Anonymous

write an equation showing for each stage.

Which stage proceeds furthest to completion?

2007-04-09 15:16:31 · 2 answers · asked by ASDF 3

2007-04-09 15:00:44 · 1 answers · asked by kkearney12iu 2

So far...

Alkali metal + water = metal hydroxide + hydrogen

Ca (valency 2) O (valency 2) + H (valency 2) O
= Ca (OH) (valency 2) + H (valency 2)

I then canceled the valencies...

CaO + H (valency 2) O = Ca(OH) (valency 2) + H (valency 2)

However I am unable to blanance this, what is wrong?

2007-04-09 14:36:53 · 4 answers · asked by Alley 2

why do i think chemistry is so cool? it gives me butterflies when i see a word like potassium nitrate or hydroxic acid. i hardly know ANYTHING about chemistry, yet seeing these things makes me want to know what the chemical is down to the molecule. i don't get it.

another thing, im a Sophomore in highschool now. i havent taken a chemistry class though. could my desire for chemistry fuel a career later on and at least keep it interesting?

2007-04-09 14:30:26 · 3 answers · asked by Stoker 2

Which of the following are true about transition metal elements ?


(a) As the atomic number increases for d-block transition elements, electrons are added to outer s and p orbitals

(b) Metals in high oxidation states tend to be good oxidizing agents

(c) A common oxidation state of scandium is +2

(d) Going across a period the atomic radii changes a great deal.

(e) As the atomic number increases for the lanthanides and actinides transition metal elements,
electrons are added to an inner d orbital.

2007-04-09 14:23:29 · 1 answers · asked by Anonymous

Compare equal volumes H2 and N2 at the same temperature and pressure.
a) Mass of each molecule.
b) The average kinetic energy of the molecules.
c) The average velocity of each molecule. (KE=1/2 mv2)
d) The number of collisions in each container.
e) What allows the pressure to be the same in each container of gas?
f) Why do odors such as skunk odor tend to fade and disappear? What molecular characteristics of a gas could cause it to disperse its odor more quickly?
g) How do you convert Ferinheit to Celcius? && Vise Versa?

I would appreciate it so much. Thank you. :)

2007-04-09 13:45:39 · 2 answers · asked by kickitup21 1

This is easy, but I can't remember the number its 6xsomething, I think.

What is the mass of one molecule of C8H18?
The numbers are subscripts.

2007-04-09 13:41:41 · 1 answers · asked by mrfame1017 3

A bad of potato chips at an ocean beach is taken on a picnic in the mountains. You notice the bag starts to inflate almost to the point of bursting. Why does this occur?

2007-04-09 13:39:17 · 2 answers · asked by SICK MY DUCK! 1

2007-04-09 13:36:44 · 2 answers · asked by Steven H 1

2007-04-09 13:14:30 · 3 answers · asked by Cindy B 2

How many grams of sodium hydroxide will you have if you evaporate two liters of a one molar aqueous solution of sodium hydroxide?

2007-04-09 13:12:57 · 1 answers · asked by Cindy B 2

2007-04-09 13:11:39 · 1 answers · asked by Anonymous

1)If 2A + B --> C is a one–step reaction, the rate expression is

(A) rate = k[C]

(B) rate = k[A]^2

(C) rate = k[A] [B]

(D) rate = k[A]^2[B]


2) A reaction mechanism has several steps. The rate of the overall reaction is equal to

(A) the rate of the fastest step.

(B) the rate of the slowest step.

(C) the average of the rates of the steps.

(D) the difference between the rate of the fastest step and the rate of the slowest step.


3) Generally an increase of ten degrees Celsius doubles the rate of reaction between gases. What is the explanation for this increase in reaction rate?

(A) The pressure is doubled.

(B) The concentration of the reactants is doubled.

(C) The average kinetic energy of the molecules is doubled.

(D) The number of intermolecuiar collisions per unit of time is doubled.

(E) The number of particles with an energy above a minimum activation energy is doubled.

5) X and Y react together. For a three-fold increase in the concentration of X there is a nine-fold increase in the rate of the reaction. This shows that the order with respect to X is

a) 0

b) 1

c) 2

d) 3

2007-04-09 12:20:13 · 1 answers · asked by studentofscience 1

Thanks,

2007-04-09 12:17:18 · 1 answers · asked by lpspider7 1

(a) As the atomic number increases for d-block transition elements, electrons are in general added to an inner d orbital

(b) Metals in high oxidation states tend to be good reducing agents

(c) Common oxidation states of nickel include +8

(d) Going across a period the atomic radii changes a great deal.

(e) As the atomic number increases for the lanthanides and actinides transition metal elements,
electrons are added to an inner d orbital.

2007-04-09 11:44:54 · 1 answers · asked by Demaurey D 1

[Mn(CO)5Cl]

2007-04-09 11:44:03 · 2 answers · asked by Demaurey D 1

What volume will a mixture of 0.42 mole H2 and 0.84 mole Ar occupy at 650.0 torr and 16.0 °C?

2007-04-09 11:24:24 · 3 answers · asked by Anonymous

The half-life of Carbon-14 is 5730 years.

The equation expressing radioactive decay is
N=(No)e-kt (-kt is raised)

N=amount at time t
No=amount of substance at time 0
e=2.718(roughly)
k=constant

How old is an animal bone that has lost 30% of it`s carbon-14?

I`m not sure if you rely solely on the above equation.

2007-04-09 10:54:25 · 2 answers · asked by Anonymous

2007-04-09 10:53:22 · 1 answers · asked by Anonymous

Are these salts acidic, basic or neutral
KI
NH4NO3
KClO
CaCl2
Fe(NO3)3
NaC2H3O2

2007-04-09 10:45:33 · 2 answers · asked by silentcargo 3