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Acetic acid vapour contains a proportion of planar, hydrogen-bonded dimers. The relative permittivity of pure liquid acetic acid is 7.14 at 290K and increases with increasing temperature. Suggest an
A car of mass 1500 kg is travelling at 30km/hr along a level icy road when the motorist enters a curve (unbanked) of radius 10m. The coefficient of friction between the tires and the road is 0.05.
A 20 kg box rests on a 35 deg ramp. The coefficients of static and kinetic friction are 0.75 and 0.45, respectively. What force up the ramp is required to:
Suppose the solubility of your unknown carboxylic acid is 6.8g/ml water at 95C and 0.17g/ml water at 0C. Given that you use 150 ml of water in the recrystallization.
A string with linear mass density of 0.141 kg/m is under a tension of 103 N. How much power must be supplied to the string to generate a sinusoidal wave of amplitude 1.69 cm and frequency 117 Hz?
A 0.1723-g sample of solid magnesium is burned in a bomb calorimeter that has a heat capacity of 1769 J/° C. The calorimeter contains exactly 311 g of water, and the temperature increases by 1.1
An 8.4 kg crate is pulled 4.8 m up a 30° incline by a rope angled 18° above the incline. The tension in the rope is 125 N, and the crate's coefficient of kinetic friction on the incline is
Suppose the barium sulfate weighed in the crudible above was not completely dry. How would this affect the concentration calculated for the barium hydroxide?
The equilibrium constant for the hydrolysis of the dipeptide alanylglycine by a peptidase enzyme is K = 8.1 x 102 at 310 K. Calculate the standard reaction Gibbs energy for the hydrolysis.
A resistor connected across an AC power supply has a current given by I=(1.05 A)cos{(300t)} when connected to a power supply with emf 120 V rms. A) Find the rms current. B) Find the resistance. C) F
How many grams of gold are required to provide a gold coating 0.40 mm thick on a cylinder having a diameter of 0.70 inches and length of 6.0 inches?
A student makes a simple ac generator by using a single square wire loop 14 cm on a side. The loop is then rotated at a frequency of 60Hz in a magnetic field of 1.9×10^-2 Tesla . What is the m
A sample of serum has a mass of 54 mg and a volume of 225 cm^3. What is its density in g/cm^3? What would be the mass of 150 fluid ounces of this serum? What would be the volume of 1 pound of this s
If a car traveled at an average speed of 80 km per hour for 20 minutes, and then slowed to an average speed of 50 lm per hour over the next 15 minutes. How far would it travel in total?
A home receives 1.7 kW of electric power from a transformer on a nearby pole. The line from the substation to the transformer is at 9.0 kV and has 0.10 \Omega resistance. What fraction of the power
How many grams of sodium sulfate should be added to how many grams of sulfuric acid to give 1.00 L of buffer with pH 2.80 and a total sulfur concentration of 0.200 M?
If you wish to further purify this liquid after column chromatography, what techniques could you use? What would the limitation of carrying out this technique be?
You plan to purify a product by column chromatography using silica gel as your stationary phase. What is the minimum mass of silica gel needed to carry out purification?
A tire holds air (assume it's all N2) at a pressure of 3 atm, and in one week the pressue drops by 1% because of inevitable leakage at the rim, when the temperature is 300 K.
How do you calculate the concentration of oxalic acid and potassium permanganate for each run when you are given the stock concentration of each compound and the amount of Liters in each run.
In humans, oxygen is effectively delivered to the tissues because of the presence of several allosteric modulators. Name three of these modulators and explain how their presence allows oxygen to be
In order to create an engineered human hemoglobin molecule that had the same bicarbonate binding properties as crocodile hemoglobin.
Other animals have similarly adapted to using small molecules as allosteric effectors to encourage hemoglobin to release its oxygen. Whereas humans use 2,3-BPG and crocodiles use HCO3-, birds use m
A 2800 kg space vehicle, initially at rest, falls vertically from a height of 3000 km above the Earth's surface. Determine how much work is done by the force of gravity in bringing the vehicle to the