ECF potassium levels affect resting membrane potential. Hyperkalemia (excessive levels of potassium in the blood) and hypokalemia (abnormally low blood potassium levels) both affect the function of nerves and muscles. • Explain how hyperkalemia will initially affect the resting membrane potential and the generation of an action potential. The resting membrane potential is based on the polarization of the cell. If there are higher levels of potassium, then the resting membrane potential will be less than normal and an action potential will be not likely with the same amount stimulation.
There will have some error. 2) A volatile liquid was allowed to evaporate in a 43.298 g flask that has a total volume of 252 ml. the temperature of the water bath was 100˚C at the atmospheric pressure of 776 torr. The mass of the flask and condensed vapor was 44.173 g. calculate the molar mass of the liquid. T = 273 + 100 = 373 V = 252 mL = 1 L / 1000 mL = 0.252 L P = 776 Torr R= 0.0821 mass of 44.173 - 43.298 g = 0.875g moles of gas = PV / RT = 776 x .252 / 62.363 x (273+100) =0.00841 moles molar mass = 0.875g / 0.00841 moles = 104.1 g/
MYTH! Drinking water will only absorb into your body which means water will only hydrate you. - Drinking lots of water leads to weightless. MYTH! It doesn't, it only leads to losing water weight.
Calculate the molarity of the original vinegar solution and its concentration in gdm-3, given that it reacts with NaOH in a 1:1 ratio. 7. 2.5 g of a sample of ethanedioic acid, H2C2O4.nH2O, was dissolved in water and the solution made up to 250 cm3. This solution was placed in a burette and 15.8 cm3 were required to neutralise 25 cm3 of 0.1 moldm-3 NaOH. Given that ethanedioic acid reacts with NaOH
Considering the fact that substances have differences, the specific heat varies depending on what substance is being heated. Calorimetry is performed with a calorimeter. These can be intricate and expensive devices, but in this lab, two Styrofoam cups are used. The purpose of this experiment is to calculate the specific heat of a foreign metal. To do this, the metal will be heated, and then put into water to determine the heat transferred.
This would affect the volume of gas captured in the pipette. And with a limited amount of sucrose its possible sucrose wouldnt properly fill in as a source of glucose for cellular respiration. Another source of error would be that we didnt let the burner heat up all the way to the correct temperature so that would affect the outcome massively and significantly. Also when we had 10% sucrose, we only recorded the time two times, compared to the other percentages of sucrose where we had many other trials and times recorded. We also found problems when we had placed clay on the tip of the pipette to seal the air out.
Also, there is a limit of how much solute you can put in the solvent and you should not exceed that certain percentage. If you put too much solute and end up having more solute than the water, the freezing point will start going back up again because the solute won’t be able to dissolve within the solvent at such a big quantity. Another limitation is that the concentration of the solvent in the mixture should be at least 10% and if it’s lower, the freezing point depression might not be affected because the amount of solute used will be too low. Lastly, the solution must be cooled to a lower temperature than the pure solvent in order to freeze. If water was used as the solvent, it has a freezing point of 0 °C and the solution will freeze at even a lower temperature so you have to put it somewhere cool like a freezer.
D) the absence of charged molecules inside cells. Answer: C Page Ref: Section 3 11) The ________ pressure is the pressure required to prevent the flow of solvent through a solvent-permeable membrane that separates two solutions of different solute concentration. A) hydrostatic B) electromotive Answer: C Page Ref: Section 3 12 C) osmotic D) partial 12) Which is true about the solubility of electrolytes in water? A) They are all insoluble in water. B) They are usually only sparingly soluble in water.
At low pressure, the manometer displayed a 100% error, which trailed off smoothly to a final value of 31% at high pressure. The piezometer, on the other hand, simply fluctuated up and down between 0 and 10% error with no relationship to the pressure level. This could be evidence of a small leak in the manometer which causes a fixed pressure drop, causing a greater percent difference at lower pressures than at higher pressures. Introduction and Objective: Pressure is a measure of force exerted per unit area. In order to use the principles of fluid statics to analyze pressure in a system, it is helpful to make several assumptions.
This also can be equated to epsilon x l x c as described on the bottom. The limitation of the Beer-Lambert Law is that the absorbance can’t be used to make comparisons, thus concentration is important. For example, a highly concentrated solution will produce a higher absorption due to the high molecule interaction. However a highly diluted solution will produce a rather lower absorption due to the lack of molecules to interact with. Materials: Benzene, Cyclohexane, Unknown solution U1.2, 0.1M potassium thiocynate, Acetone, 3M sulphuric acid, 10-3 M ferric sulphate in 1M sulphuric acid Procedures: Determination of benzene: Record the spectrum of cyclohexane alone over the range 230 - 270 nm.