Hi everyone.
I'm doing a pre-lab for AP chem class. I forgot to check for specific data I need in the Merck. I was wondering whether anyone out there has the molar mass value and pKa of the indicator bromcresol green.
Any help would be great.
Thanks in advance.
Q. A street light is mounted at the top of a 15-ft tall pole. A man 6 ft walks awsay from the pole with a speed of 5ft/s along a straight path.How fast is the tip of his shadow moving when he is 40 ft from the pole?
What I've done so far:
this scenario can be drawn as similar triangles. from...
hi all, my chemistry assignment had a bunch of questions on redox equations balancing. i got stuck on this one:
[tex] \CrI_{3} + KOH + \Cl_{2} \rightarrow \K_{2}CrO_{4} + \KIO_{4} + KCl + \H_{2}O [\tex]
so far, i tried to find ON numbers of the various elements.
Cr changes from +3 to +6...
Hi all,
The other day in chemistry class, we carried out several different redox reactions. In one set of the experiments, we reacted potassium permanganate with 3 different potassium halides (KCl, KBr, KI). this particular redox reaction also requires an acidic environment, so sulfuric acid...
hi all,
im wondering why it is dangerous to grind a mixture of powdered aluminium with potassium chlorate in a mortar and pestle.
any help would be great.
Hi all. I have a analytic geometry question that I need a bit of help with.
consider the concentric circles with the equations:
x^2 + y^2 = 9
and
x^2 +y^2 = 4
A radius from the center O intersects the inner circle at P and the outer circle at Q. The line parallel to the x-axis through P...
i was told that the atom is spherical, but for simpler purposes to pretend it as a cube. then i would "stack" the cubes to find the radius of it. so i found out how many mols of Al there were in 0.4 g. and then i found the # of molecules in 0.4g of Al [assuming that it is pure Al] i can't be...
hi everyone,
im trying to find the atomic radius of an Al atom using a few measurements i have. i had a piece of aluminum foil its measurements were [ 10cm*9.9cm*0.0014cm ]. The mass of the aluminum foil was 0.40 grams. Is there any possible way i can find the radius of an Al atom? I know i...
"Hot" Water
I have this problem in class that I could not solve. Could some one please help me?
I have 100mL of water made with tritium (radioactive isotope of hydrogen). If I were to pour this 100mL of hot water into the ocean (given the volume of the ocean is 1.3*(10^18)m^3) how many...
thanks drdolittle,
i have some question about your idea though. I'm really not sure what the traveling salesman problem is. do you think you could elaborate on that a little more?
thanks =D
well, there are several components to the project. but mainly, the end product would be a presentation (probably only informational) and a brochure for the class. my biggest interest was in forensice science, but unfortunately someone else has taken that topic. I am also interested in evolution...
Hi all,
I am a grade 11 biology student. I have this genetics project coming up in a few weeks, and I am allowed to research on anything I would like. Could you please help me and try to come up with some really good topics for my project? Thanks. (btw, someone else in my class is already...
one quick question though. as chem_tr suggested, we should use warm water to clean latex paint. however, how does using hot water allow the removal of latex paint? is it because latex paint will dissolve in water, allowing both the removal of water and the paint at the same time?
by the way...
i have one question though, what makes surcrose and glycerin different from butanol and pentanol that allows them to be soluble in water, and not the mentioned alcohols.
also, what makes ethanol and butanol different ? (ethanol is water soluble, but not butanol). i speculate this has...