What is the free-energy cost of pumping Ca2+ out of a cell when the cytoplasmic concentration is 0.4 micromolar, and the extracellular concentration is 1.5 micromolar, and the membrane potential is -60 mV?

Find the probability of passing : A quiz cosists of 10 multiple-choice questions, each with 4 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 60 %. |

Find the length of the field : Find the length of the field, to the nearest tenth, that will give the entire field a maximum area if 414 m of fencing is available. |

Compute the ph at the equivalence point : (a) How many mL of KOH will it take to reach the equivalence point? (b) Calulate the pH at the equivalence point. The Ka of HClO is 3.8x10^-8 |

Find the probabilities that the driver will pick up : A taxi driver knows from past experience that the number of fairs he will pick up during an evening is a random variable which has the mean 25.6 and S.D 4.2 .Find the probabilities that the driver will pick up. |

The extracellular concentration and the membrane potential : the cytoplasmic concentration is 0.4 micromolar, and the extracellular concentration is 1.5 micromolar, and the membrane potential is -60 mV? |

Use the least squares line to estimate britain independence : The inflation rate for Britain is 6.8. Use the least squares line to estimate Britain's independence rating. |

Find the speed at which a ray of light from the lighthouse : A revolving lighthouse is located 100 m from the nearest point P on a straight shoreline. The light makes one revolution every 30 seconds. Find the speed at which a ray of light from the lighthouse moves along the shore at a point 200 m from P. |

State structure that corresponds to the molecular formula : Give the structure that corresponds to the following molecular formula and 1H NMR spectrum: C7H12Cl2: ? 1.07 (integral = 6203, s); ? 2.28 (integral = 1402, d, J = 6 Hz) |

Find the amount of paint needed to paint a region : Find the amount of paint needed to paint a region that is the shape of a parabola...15 meters tall with a base of 10 meters if 1 liter of paint covers 10 square meters. |

## Describe briefly how you could prepare the buffer solutionExplain briefly how you could prepare the buffer solution in (a) if you had available the solid salt of the only one member of the conjugate pair and solution of a strong acid and a strong base. |

## What is the rate constant for the reactionthe frequency factor a is 8.7x 10 12 s- and the activation energy is 63 kj/mol, What is the rate constant for the reaction at 75C |

## What is the molarity of a solutionWhat is the molarity of a solution produced by dissolving 31 g of Cu(NO3)2 in a 100 mL volumetric flask?(Enter unit as M.) |

## Compute mass percent of solutionAssume a density of 1.08g/mL for the solution. A)Find molarity of solution B)Find molality of solution C)Calculate mass percent of solution |

## Explain how an acid-base indicator worksQualitatively, describe how an acid-base indicator works. Why do we want to use a minimum amount of indicator in a titration? Select all that apply. |

## State structural formula of the lewis-acid base complexGive the structural formula of the lewis-acid base complex which consists of one mole of phenylmagnesium bromide and two moles of diethyl ether. |

## What is the outside temperature in kA helium-filled balloon has a volume of 2.75 L at 17 C. The volume of the balloon decreases to 2.36 L after it is placed outside on a cold day. What is the outside temperature in K? |

## What are the coefficients of the species shownWhen the following equation is balanced properly under acidic conditions, what are the coefficients of the species shown? |

## State the gas buret before the hydrogen gas is genteratedthe gas buret before the hydrogen gas is genterated and is not removed, will the reported percent aluminum in the sample be too high or too low? |

## What is the activation energy for this reactionWhat is the activation energy for this reaction? a) 112 kJ/mol. b) 56 kJ/mol. c) 28 kJ/mol. d) 336 kJ/mol. e) 448 kJ/mol. |

## Calculate the freezing point of the solutionThe osmotic pressure of an aqueous solution at 300 K is 120 kPa. Calculate the freezing point of the solution. |

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