Sunday

April 20, 2014

April 20, 2014

Total # Posts: 22

**Math**

use the digits 1,2,3, and 4 to write a number in scientific notation that is close to .001 this was in a 7th grade algebra book... what? is this even possible without the use of 0?

**Chemistry**

The standard free energy of activation of one reaction is 94.3 kj/mol^-1 (22.54 kcal/mol^-1). The standard free energy of activation for another reaction is 76.4 kJ/mol^-1 (18.26 kcal/mol^-1). Assume temp of 298K and 1 M conc. By what factor is one faster than the other? Im no...

**Math**

I understand generally how to solve, by taking natural logs and the the derivative, but i am confused by the presence of the 3 in front... if f(x)= 3(sin(x))^x, find f'(1) should i move 3 to the y side or take the natural log of it? Thanks!

**Chemistry**

Organic chemistry: an attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of 11.0 degrees. If it is known that the specific rotation of the R enantiomer is -33.6 degrees, determine ...

**Chemistry**

okay thanks but that was wrong actually

**Chemistry**

Im not sure where to factor in the two longer compounds for this problem. "Rank the given compounds based ontheir relative acidities" HF H2C--CH2 NH3 CH4 HC---CCH3 This is the order i thought it was, but this isnt right apparently... (--- means triple bond, -- means ...

**Chemistry **

my mistake, the first molecule in the products should be K3Fe(C2O4)3 3H20

**Chemistry **

This is a balancing eqn Im finding rather tricky: ___Fe(NH4)2(SO4)2 6H2O + ___ H2C2O4 + ___K2C2O4 + ___ H2O2 ---> ___K5Fe1(C2O2)2 3H2O + ___(NH4)2(SO4) + ___H2SO4 + ___ H2O remember H2O2, an oxidizing agent, was used in synthesis, so youll nee to do a redox balance. Start w...

**Chemistry (WebWorks)**

has anybody done this? please share!

**Chemistry**

does anybody know the last pH calculation on number 4?? and anth is right

**chemistry**

so the henderson eqn is: pH= pKa +log([conj. base]/[acid]) so do i have to look up pKa for NaOH and then how do i find the conjugate base concentration?

**Chemistry**

false false true is right

**chemistry**

This problem is from my chemistry book and I am having a little trouble with the intermediary steps: Barium metal crystallizes in a body- centered cubic lattice (atoms at lattice points only) The unit cell edge length is 502 pm, and the density of the metal if 3.5g/cm^3. (mola...

**chemistry**

this is a wiley plus problem and there is no reading lesson with this section so im not sure how to approach this question: The element iridium has ccp packing with a face-centered cubic unit cell. The density of Ir is 22400 kg/m3. Calculate the volume (cm3) of the unit cell o...

**Chemistry**

does the mole ratio in this question affect the answer? a 2:1 mixture of O3 and O2 is allowed to effuse through a pinhole in a balloon.after a few seconds, the content of the balloon is analyzed. what will be the mole ratio of the gases in the balloon? Thanks!

**Chemistry**

could someone help me with this question? A quantity of 400 mL of .6 M HNO3 is mixed with 400 mL of .3 M Ba(OH)2 in a constant pressure calorimeter of negligible heat capacity. The initial temperature of both solutions is the same at 18.46 degrees Celsius. What is the final te...

**Chemistry**

I dont know if i am solving for the number moles of NaI correctly, i multiply .21 by 1.67, is that incorrect? i know that to solve this you have to find the limiting reagent, but i think the problem might be that i am solving for moles wrong. If 210 mL of 1.67 M aqueous NaI an...

**Chemistry**

When i try to do this problem by simply using a mole ratio, wiley keeps saying it's wrong, what mistake am i making? If 0.800 mol of liquid CS2 reacts stoichiometrically according to the balanced equation, how many moles of gaseous Cl2 are required? CS2(l) + 3Cl2(g) →...

**Chemistry**

When i try to do this problem by simply using a mole ratio, wiley keeps saying it's wrong, what mistake am i making? If 0.800 mol of liquid CS2 reacts stoichiometrically according to the balanced equation, how many moles of gaseous Cl2 are required? CS2(l) + 3Cl2(g) →...

**Chemistry**

Is there an equation used to fond remaining pressure When CS2 at partial pressure 1930 torr reacts with H2 at partial pressure 8650 torr at constant volume and constant temperature according to the balanced equation, determine the partial pressure (atm) of H2 that remains. CS2...

**Chemistry**

Is there an equation used to fond remaining pressure When CS2 at partial pressure 1930 torr reacts with H2 at partial pressure 8650 torr at constant volume and constant temperature according to the balanced equation, determine the partial pressure (atm) of H2 that remains. CS2...

**chemistry 1c**

the answer is .918

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