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If a neurons inter-celluar potassium level (K+) is 410mM and it takes -70mV to maintain resting cell potential, what is the concentration of potassium outside of the neuron? (assume that only the difference in potassium concentration is responsible for the current necessary to maintain resting cell potential)
If heat is given off by a system then the heat has a negative sign If work is done on a system then the work has a negative sign Work, heat and temperature all have units of joules The 1st law of thermodynamics is represented
1. determine how many grams of o2 are present when mass of a sample of earths crust is of 328rm gg ? note down
What is the molarity of a solution that contains 35.0 g of vitamin B1 hydrochloride (molar mass = 337 g/mol ) in 110 g of solution?
a 155 gram sample of copper was heated to 150 degrees celsius then placed into 250 gram of water at 19.8 degrees
What is the freezing point of a solution made by dissolving 352g of ethylene glycol C2H6O2 on 648 g of water the freezing point of pure water is 0.0C and kf of pure water is -1.86Cm?
A 10 liter sample of oxygen 0.0°C and 15 cm. pressure is subjected to 150 cm. pressure at the same temperature. What is the new volume of the oxygen?
a 4.867 g sample of a monoprotic acid was dissolved in water. it took 30.24 ml of a 0.1578 m naoh solution to
A 0.48 mg sample of sulfur-35 has an activity of 20.4 Ci. What is the decay constant of sulfur-35 (in /s)
Proposed a detail mechanism for the zinc mediated debromination of trans-1,2-dibromocyclohexane. The reagent used was zinc and water and heat where also added to the reaction. The products fromed included ZnBr2 and cyclohexane
consider a sample that is a mixture composed of biphenyl benzoic acid benzyl alcohol. the sample is spotted on a tlc
the vapor pressure of pure acetone propanone is 266 torr. when a non-volatile solute is added the vapor pressure of
assume that the pressure in the bottle was 1.5 atm, the bottle had a headspace of 20 mL, and the headspace contained 90% CO2. carbonate species and dissociation products of water.
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