Homework Help

how does osmoregulation (the process) function in living osmoregulators and osmoconformers, and why is it important to these organisms? What factors affect osmoregulation other than salt/ solute concentration? oh.. and how does osmoregulation affect body volume? THANNKS!

) The standard reduction potential for Zn+2 is -0.76 V. Calculate the voltage of the following cell at 25°C. Zn|Zn2+ (1.0M) || H+(0.001 M), H2 (g,1.0 atm)|Pt

Chamber A and B are seperated by a semi-permeable membrane. Chamber A contains 2.1 M NaCl and chamber B contains 9.5 M NaCl. If Na+ is in equilibrium across the membrane, what is the electrical potential differene? What side of the membrane is electrically positive? Nernst Equation for sodium E(Na) = 61/(1) log 145mM/ 15mM = 60.1 mV 1 is valence 145 extracellular concentration 15 intracellular concentration Any help would be appreciated

with the equilibrium constant, when K<1 the reactants are favoured, when K>1 the products are favoured but when K=1...what happens? also, does any1 know whether the terms "carbanion" and "carbocation" refer to a whole molecule or just to the C in the molecule?

Ka for HF is 6.8x10-4. Calculate the pH of a 0.35 M solution of HF? i dunno how to do it

Kc for the following reaction at 25C is 4.8x10-6. Calculate the equilibrium concentration (in mol/L) of Cl2 (g) if the initial concentration of ICl (g) is 1.33 mol/L. There is no I2 or Cl2 initially present. 2ICl(g)=I2(g)+Cl2(g) Thanks in advance.

Heya everyone This year I have to do a physics investigation for coursework for the OCR "Advancing Physics" course. It has to be a unique investigation just based on something of our choice, not just a typical school experiment, but I really can't think of anything exciting that is faesible with our school's resources. If anyone could give me any suggestions that would be really appreciated. I'd really like to do something on electricity or magnetism or possibly optics. The standard is one year before degree level, so it doesn't really need to be that complex. Some of the examples they gave were pretty lame, like measuring the strength of human hair, but I'd like…

I'm facing a bit of a dilemma - I'm in the school debating team and I usually quite enjoy it because they give us interesting topics that can be argued from both sides with relative ease once you really think about them. However, this time they decided to give us the topic "That We support the measures used at Guantanamo Bay". Abiding by Murphy's Law, we got the honour of having to affirm the moot. Thus, this is my lowly plea for help... anyone have any ideas?

What are the bond orders in H2, H2+, and H2- respectively based on molecular theory thanx guyz

hey does any1 know that out of acyl chloride, amide, acyl anhydride, ketone and ester...which one won't undergo hydrolysis? do carboxylic acids and their derivatives always undergo hydrolysis? thanx

Calculate the activation energy of a reaction that has a rate constant of 4.41x10-3s-1 at 78C and rate aconstant of 9.79x10-2s-1 at 315K thanx for help

please balance the following redox reaction in acidic solution: HClO2 + MnO2 -> Cl2 + MnO4- Thank you!!!

The half-life for a certain first order reaction is 13 minutes. If the initial concentration is 0.085M, how many minutes will it take for it to decrease to 0.055M

1. the radius of an argon atom is 4.2e-8 cm. What percent of the total volume of a 1 mol sample of argon gas at STP is occupied by the argon atoms? [0.83] im really stuck on this one! 2. calculate the P[total] in atom for a mixture of 3 gases that have partial pressures of 72cmHg, 400mmHg and 0.65mHg respectively.[ans:2.33] dont i just add those up and then divide by 760 to change to atm?? coz that doesnt give me the right ans. 3. A volume of 10cm^3 each of O2 gas and CO gas at STP are mixed in a 20cm^3 container and allowed to react at constant temperature to yield CO2. Calculate P[total] in atm after the reaction is complete. [ans: 0.75] i thought P1…

hey could i have some help on how to do this question? Thanks Sarah

a projectile is fired from the top of a 40m tower at an angle of 60 degrees above horizontal hits the ground at the point 100 from the base of the tower. find the speed at which the stone was thrown? find the speed of the stone just before it hits the ground?

I need some help with the theory section of my biology coursework on catalase (an enzyme). I need to make a QUANTATATIVE PREDICITON. THIS IS WHAT I HAVE SO FAR: So far I have wrote about the 10 degree rule Quantitative prediction I predict, in quantitative terms, that at every ten degrees Celsius increment the reaction rate will double. This is based on the activation energy needed to start a reaction. The activation energy is the amount of energy needed in a collision for hydrogen peroxide and catalase molecules to start a successful reaction. If this energy is not reached by the molecules, a reaction will not take place. In most cases, the majori…

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The diagram below shows a block of mass m=2.0\; \rm kg on a frictionless horizontal surface, as seen from above. Three forces of magnitudes F_1 = 4.0\;{\rm N}, F_2 = 6.0\;{\rm N}, and F_3 = 8.0\;{\rm N} are applied to the block, initially at rest on the surface, at angles shown on the diagram. View Figure In this problem, you will determine the resultant (total) force vector from the combination of the three individual force vectors. All angles should be measured counterclockwise from the positive x axis (i.e., all angles are positive). this is the question Calculate the magnitude of the total resultant force \vec{F}_{\rm r} = \vec{F}_1+ \vec{F}_2 +\vec{F}_3 acting…

i'm having difficulty working out this question find all possible values of d when a certain positive integer N is divided by a positive integer d, the remainder is 7. if 2N + 3 is divided by d the remainder is 1 any help to get me started.........

(a) Find all positive integers N such that the product 2005 x N has exactly 6 divisors. (b) Find all composite integers M such that the product 2005 x M has exactly 8 divisors.

Well exams are coming up and id like to memorize something easy casue i have to define like 28 words, im looking for short version of the term for easy memoring, thanks. Atom- Chromosome- Dependent Variable- Fertilization- Independent Variable- Mitosis- Valence- Battery- Cicuit- Deoxyribonucleic Acid- Gamete- Karyotype- Nucleus( both version ) - Variable- Cell theory- Clone- Electron- Gene- Load- Static Electricity- Voltmeter- Chloroplast- Current- Element- Gonda- Meiosis- Theory- Zygote- Thanks in advance.

hey i have this question relating to probability plots... my teacher said that if you see a j shape (where the head of the j would be at the top right corner and the tail of the j would be at the bottom left corner, along the diagonal probability plot) in a probability plot, then that means the data is skewed...except she said that its skewed in the direction of the j...does any1 know any websites that would explain it better, or can any1 explain it to me? thanx

hey guys, ive got this question which i know it should be pretty straight forward but for some reason, i cant get the answer: Calculate the ionisation energy in kJ for a mole of hydrogen atomst that are in the n=2 energy level. I think i just use E = -2.18e-18 Ze2 (1/nfinal - 1/ninitial) what i did was substitute 1 for Z, infiinity for n final, so that becomes zero, then n = 2 into n initial. my answer ended up being 5.45e-19J, which is way too small for the answer...the answer provided was 328kJ. can any1 point out what im doing wrong? thanx

Hi everybody, I am asked to design a brochure on "Tsunami Relief and Rehabilitation".Though i have got sufficient information but i donot know how to present it ie. "How to design A Brochure" If you can please explain me Jyoti