What three things constitute the ocean (Hint: one of them is water)? Why is this fact important? How do sodium atoms and chlorine atoms combine to make the salt in the ocean?
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- What three things constitute the ocean (Hint: one of them is water)? Why is this fact important?
- How do sodium atoms and chlorine atoms combine to make the salt in the ocean?
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- The PH formula is given as PH=-log(H+). The H+ is the number of free ions of hydrogen. A seven PH is considered neutral. Discuss what having a low PH and a high PH means. What does a 12 PH mean? How about a 2? Which is more caustic? Is either a good thing at extremely high or low values? Explain fully as to what a PH means to you and what you use it for.Why doesn't frozen water sink in liquid water? Is the liquid phase of water more or less dense than the solid phase? What accounts for this pattern? Is this an unusual pattern (by comparison to other molecules)? Explain. Be specific.You are stranded on a lifeboat with several other people in the middle of the ocean. You have run out of clean drinking water and are very thirsty. The others have started to drink the seawater to quench their thirst. Since you’re waiting for rescue (and are a top notch AP Biology student), you decide to solve a couple of water potential problems to determine if drinking sea water is a good idea or not. a) The majority of dissolved ions in seawater is NaCl, roughly a 0.5M concentration. The ionization constant of NaCl is 2.0. Calculate the solute potential for seawater if you know that the water is 2°C. b) Your own cells have a 0.15M concentration. Calculate the solute potential for your own cells, knowing that body temperature is 37°C. c) Using your knowledge about water potential, if you drink the seawater, wat will happen when the seawater comes into contact with your body’s cells? Note: ΨP for animal cells is zero
- Why is ice less dense than water?The distribution of electrons across the shells of sulphur (atomic number = 16) is as follows (number of shells indicated with Roman numbers: number of electrons shown with Arabic numbers) 1-8, 11-8 1-2; 11 -4: III - 4 (1-4; || - 4; ||| - 8 () 1-2; 11 - 6; III - 8 (1-2; 11 - 8; II - 6Why is table salt, sodium chloride, almost never considered as an ionic compound, but as individual ions in a biological system?
- Atoms A and B interact to form a compound, AB2. When measured, atom A has a partial negative charge and atom B has a partial positive charge. From this information, we can conclude what? Select only ONE answer choice. Note: - means "approximately equal to" , A > B means "A is greater than B" , and A B: AB2 is hydrophilic Not enough information to answer the questionIf a solution has a pH of 1, how many more H+ are present than in a solution with a pH of 4?The “octet rule” in chemistry helps predict the types of bonds thatatoms will form. In general, an atom will be most stable if it fills itsouter shell of 8 electrons. Atoms with fewer than 4 valence electronstend to donate electrons and those with more than 4 valence electronstend to accept additional electrons; those with exactly 4 can do both.Using this rule, determine what category each of the followingelements falls into: N, S, C, P, O, H, Ca, Fe, and Mg. (You will needto work out the valence of the atoms.)
- The triple point of an element is at 75 torr and 125°C. This means that liquid is more dense than solid cannot exist at 1 atmosphere pressure cannot have a vapor pressure less than 75 torr cannot exist above 125 degrees Celsius What is the electron geometry (or electron arrangement) around an atom in a molecule or ion which is surrounded by three lone pairs of electrons and two single bonds T-shaped see-saw trigonal planar trigonal bipyramidal linear A red blood cell placed in pure water will swell because water moves from a higer osmotic pressure to a lower osmotic pressure the osmotic pressure is greater in the cell than in the water the osmotic pressure is the same in the cell and the water the somotic pressure is greater in the water than in the cellWhy the Number of Electrons Matter Since we know each element as a defined number of protons, we can also use that number to determine the number of electrons, assuming the element has no charge. Let’s write some out: ELEMENT NUMBER OF PROTONS NUMBER OF ELECTRONS C A B O C D Al E F Na G H Si I JIf a solution has a concentration of 10^-7 OH ions, how many H ions does it have?