Chemistry - March 2007

of the compound?

2007-03-20 15:21:15 · 2 answers · asked by Anonymous

a) A free radical is a molecule with no unpaired electrons

b) Molecules in the atmosphere can gain energy equal to hv by absorbing a photon.

c) Chemical reactions that do not occur at normal atmospheric temperatures can take place by absorbing a photon

d) O2(g) → O + O is an example of photodissociation

2007-03-20 15:20:44 · 1 answers · asked by kcc 1

Which of the following solutions result in a buffer ?



a) 0.100 L of 0.250 M NH3 + 0.050 L of 0.250 M HCl


b) 0.100 L of 0.250 M NH4Cl + 0.050 L of 0.025 M HCl


c) 0.100 L of 0.250 M NH4Cl + 0.050 L of 0.250 M NaOH


d) 0.100 L of 0.250 M NH4Cl + 0.150 L of 0.250 M NaOH

2007-03-20 15:06:45 · 1 answers · asked by Anonymous

...is produced???

i dont know how to get the equation...
once i have the equation i think i can work it out...
but i dont know how 2 put that in an equation and balance it

2007-03-20 14:58:28 · 1 answers · asked by xxlore09xx 1

dissociated according to the equation 2NOCl = 2NO + Cl>2 Determine the equilibrium constant

2007-03-20 14:58:15 · 1 answers · asked by Kayla H 1

I need to write a two page essay describing the composition, purpose, and looks of an atom to an average 1500's citizen. Needs to be simple enough for them to understand, and perhaps involve some of the scientific beliefs regarding elements at that time. I cannot think of a way to describe an atom to someone who does not understand the concepts of electricity, gravity, and microscopy.

2007-03-20 14:58:10 · 3 answers · asked by moonmip12 2

according to the reaction 2N>2O + 3O>2 =4NO>2 When the system reached equilibrium the concentration of the NO>2 was found to be 0.020 mol/L. Calculate the equilibrium molar concentrations of N>2O and O>2 and and value of Kc

2007-03-20 14:55:03 · 2 answers · asked by Kayla H 1

1.29x10^-3 mol/L of PCl>3 and 1.87x10^-1 mol/L of Cl>2. Calculate the equilibrium molar concentration of PCl>5 in the vessel.

2007-03-20 14:50:16 · 2 answers · asked by Kayla H 1

and can you give some examples of the kinds of compounds hydrogen forms? Thanks!

2007-03-20 14:48:47 · 14 answers · asked by Anonymous

I need to write a two page essay describing the composition, purpose, and looks of an atom to an average 1500's citizen. Needs to be simple enough for them to understand, and perhaps involve some of the scientific beliefs regarding elements at that time. I cannot think of a way to describe an atom to someone who does not understand the concepts of electricity, gravity, and microscopy.

2007-03-20 14:34:33 · 3 answers · asked by moonmip12 2

2007-03-20 14:25:17 · 1 answers · asked by Anonymous

2007-03-20 14:24:21 · 2 answers · asked by Anonymous

For a class experiment, we placed steel in different solutions to determine which solution causes the most rusting. To measure the amount of rust, we compared the color of the solution to a color scale. For example, a solution that corresponds to a 2 on the color scale is lighter and color than a solution that corresponds to a 12 on the color scale, which means it rusted less. (Note: The color scale consisted of different shades of orange with numbers assigned to each.) Is the qualitative or quantitative? Or is it semi-quantitative?

2007-03-20 14:23:12 · 1 answers · asked by Anonymous

What will be the effect of adding 0.5 mL of 0.1 M HCl to 100 mL of a phosphate buffer in which [H2PO4-] = [HPO42-] = 0.35 M?
The pH will increase slightly.
The pH will increase significantly.
The pH will decrease slightly.
The pH will decrease significantly.
Since it is a buffer solution, the pH will not be affected.

can youguys show me how to work wiff this problem, i apprecitate that. thanks

2007-03-20 14:22:28 · 1 answers · asked by jennifer 2

(.013). The mixture also contains the gas acetylene (C2H2). What is the mole fraction of acetylene>?

2007-03-20 14:03:56 · 2 answers · asked by Bri 3

a) a container of gas in compressed to a smaller volume at constant temperature.

b) a container of gas has more gas added into the same volume at constant temperature.

c) the gas in a container of variable volume is heated at constant pressure.

2007-03-20 14:02:02 · 1 answers · asked by kcc 1

We just finished our stoichiometry unit in my high school chem class and I need to know atleast two different practical uses of percent composition.

2007-03-20 13:56:48 · 1 answers · asked by MCait081205 2

By substituting in the Schrodinger equation for hte harmonic oscillator, show that the ground-state vibrational wave function is an eigenfunction of hte total energy operator. Determine the energy eigenvalue.

2007-03-20 13:49:33 · 2 answers · asked by Anonymous

2007-03-20 13:49:30 · 1 answers · asked by Stephanie P 1

of carbon monoxide

2007-03-20 13:48:41 · 2 answers · asked by Bri 3

In a trigonal planar structure such as CH2O molecule, with one double bond and two single bonds, how does the double bond affect the angle between the two single bonds?

2007-03-20 13:44:09 · 1 answers · asked by Paige 1

2007-03-20 13:37:59 · 2 answers · asked by kcc 1

2007-03-20 13:37:03 · 2 answers · asked by zballjan 1

sufficient water to prepare 2.75 L of solution?

2007-03-20 13:28:20 · 2 answers · asked by Bri 3

What term refers to the condition in which the concentration of the reactants and products remains constant over time?

forward reaction

reverse reaction

chemical equilibrium

rate

What is meant by a reversible reaction?

Under what conditions can the equilibrium point change?

which is higher, the energy of the reactants or the energy of the products? (like how do you know)

energy of reactants

energy of products

2007-03-20 13:21:19 · 1 answers · asked by sol 2

Please answer before 10 PM Pacific. Thanks. =)

2007-03-20 13:20:32 · 5 answers · asked by DTSL 2

when a 2:1 mixture of SO2(g) and O2(g) at a total pressure of 5atm is passed over a catalyst at 425 degrees, the partial pressure of SO3(g) at equilibruim is found to be 3 atm, calculate the value of Kp

2007-03-20 13:20:12 · 1 answers · asked by RT 2

2007-03-20 13:04:40 · 4 answers · asked by mrlabc123 2

Balance please?

2007-03-20 13:04:02 · 4 answers · asked by kickitup21 1

hey all... can you plz answer these questions? THANKS!

3. What element has a melting of 570 degreee F?
5. What element has a specific gravity of 1.55?
8. What element has a boiling point of 2897 C and a melting point of 1494 C?
13. What element smells like rotten aggs?
14. What element melts at 419 C and boils at 908 C?

EVEN if u can just answer one for me... u'll be a BIG help! THANKS AGAIN!

2007-03-20 13:03:57 · 5 answers · asked by Anonymous