Pholcus phalangioides is pale yellow-brown except for a large gray patch in the center of the cephalothorax. The body and legs are almost translucent. These spiders are covered with fine gray hairs. The head is a darker color around the eyes. A translucent line marks the dorsal vessel.
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the body of water between Africa, Europe, the southern ocean...
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Autoionization of water. Since acids and bases react with each other, this implies that water can react with itself! While that might sound strange, it does happen - − water molecules exchange protons with one another to a very small extent. We call this process the autoionization, or self-ionization, of water.
- in Example 2 , i didn't understand why [H] = 6.3x10...+ x ,why was x added to the concentration of H...The HCl is so dilute that we must consider both the concentration of H⁺ from the HCl *and* the concentration of H⁺ from the ionization of the water...
- In this article, the value of Kw has been given as 10^-14. But should it not be 10^-14(mol/L)^2? Why...That's a really great question! My not so great answer is that it is pretty common in textbooks to drop the units for concentrations when calculati...
- In exercise 2, the question states that the solution has a hydronium ion conc. of 6.3*10^-8 M. It do...The article also left me wondering this. If someone states that "a HCl solution with a hydronium ion concentration of 6.3 * 10^-8 M" I would assume...
- How come we multiply the pH value by 2 when the temperature is 0C°?In pure water, at any temperature, [H3O+] equals [OH-]. At 0 C, pKw = 14.9. pKw = pH + pOH. As [H3O+] equals [OH-], then pH must equal pOH because...
- I understand how adding an acid such as HCl to water increases the number of H30 ions as the release...you can use reaction equilibrium to explain this: at 25 degree Celsius, K(w)= 10^(-14) Let [H+] and [OH-] be the initial concentration of H+ and OH...
- We see that the pKa of water is 14 at 25 degrees Celsius, since the -log of 10^-14 is 14. However, m...There is an article about this via the following link: http://chemwiki.ucdavis.edu/Core/Organic_Chemistry/Fundamentals/What_is_the_pKa_of_water%3F...
- In Try 2, why is the contribution of [H+} from autoionization not 1 x 10^7?The autoionization of water is an equilibrium reaction. H₂O ⇌ H⁺ + OH⁻ The addition of H⁺ from the HCl pushes the position of equilibrium to the le...
- do the ph and the poh change with the change of the temperatureYes. If the water changes temperature then so does the Kw value, and pH and pOH depend on the kW value. Hope that helps.
- When an acid is added to pure water, the resultant solution will have more hydronium ions and fewer ...If it has more hydronium ions and fewer hydroxide ions, then H3O+ might have a concentration of 10^-5 and OH- could have 10^-9. You have them in th...
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Water changed position and speed in the region between the dashed lines, but it did so in such a way that it will be moving with the exact same speed (e.g. v a v_a v a v, start subscript, a, end subscript and v b v_b v b v, start subscript, b, end subscript) and have the same height as the previous water had in that location. The only thing ...
- It's a lot more difficult than the videos, and if I hadn't watched the videos before, I probably cou...Hmm, sorry it was confusing. If other people feel the same way I'll rewrite it. As for the steady flow question, the water molecules have randomly...
- Under the explanation of the question "Wait, does that really follow?", I have a question on why whe...Fluids exert pressure in all directions. So the parts of the fluid on the left (P1) of the highlighted region are exerting a pressure on the highli...
- Hang on, Isn't the pressure always supposed to be constant? I mean, I know from the previous videos ...Pascal's Principle applies to fluids that are initially static. In this case, we have a dynamic fluid whose motion is being analyzed...hope that ma...
- how is pressure on static fluid different from that of a moving fluid?Since Bernoullis theorem proved that for a horizontally flowing fluid without the height, the P+1/2*ρv^2 is constant, if the velocity is possessed...
- Why would we use +9.8 as our gravity, when it acts in the negative direction?Gravity is not negative or positive, it's just downward. If you define down as the positive direction, g is 9.8 m/s^2. If you define up as positive...
- The numbers of the last question don't add. I get a pressure of about 613,890 Pa. Anyone else got th...The numbers in the last question do add up: P1=601229.01 Pa
- I still don't understand "Incompressible fluids have to speed up when they reach a narrow constricte...this is due to the pressure energy...at the constriction, pressure energy decreases so kinetic energy increases
Water is the main component of the fluids that protect and lubricate tissues. For example: cerebrospinal fluid surrounding the brain and spinal cord protects these organs against sudden changes in the environment. amniotic fluid provides a cushion of protection for a pregnant woman's developing baby. pleural fluid lubricates the lungs to make ...
flavonoid, also called flavone, any of a class of nonnitrogenous biological pigments extensively represented in plants. Flavonoids are water-soluble phenolic compounds (having a –OH group attached to an aromatic ring) and are found in the vacuoles of plant cells. More than 3,000 different flavonoids have been described. Many members of this group, notably the anthoxanthins, impart yellow ...
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The phialide ( / ˈfaɪəlaɪd / FY-ə-lyde; Greek: phialis, diminutive of phiale, a broad, flat vessel) is a flask-shaped projection from the vesicle (dilated part of the top of conidiophore) of certain fungi. It projects from the mycelium without increasing in length unless a subsequent increase in the formation of conidia occurs.
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