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The atmospheric activity of 14 C is 15 cpm/gC (counts per minute per gram of carbon). Assume that the cloth was made in the year 24 B.C. The half-life of 14 C is 5730 years. What will be the expecte
Suppose that we align a compass needle with the horizontal component of the Earth's magnetic field, What is the size of the horizontal component of the Earth's magnetic field
At 63.5oC the vapor pressure of water is 175 torr and that of ethanol (C2H5OH) is 400 torr. A solution is made by mixing equal masses of water and ethanol.
A small cube of lithium (density = 0.535 g cm-3) measuring 1.00 mm on each edge is added to 0.500 L of water. The following reaction occurs- 2 Li(s) + 2 H2O(l) ? 2 LiOH(aq) + H2(g)
Calculate the pH of this solution. When 0.20 mol of H+ ions is added to the solution what is the pH (assuming volume change is negligible)
What is the heat of the reaction which forms 1.00 mole of gaseous monatomic bromine from 0.500 mole gaseous diatomic bromine.
The aorta carries blood away from the heart at a speed of about 40 cm/s and has a radius of approximately 1.1 cm. determine the approximate number of capillaries in the human body
Pentan-2-ol reacts with tosylate/nucleophile and the following: Hydroxide, cyanide, bromide, sodium propoxide and ammonia. What are the products from each? Then 2-methylpentan-2-ol reacts with the s
Using the quantities given in the Procedure, calculate the theoretical yields for the mononitration of (a) acetanilide and (b) methyl benzoate. Acetanilide = quantity is .5 g and molar mass 135.17 g
A jackhammer causes a sound intensity of 95 bB at a point where a person is standing. What is the sound intensity level at the position of the listener
To do so she places 100.0g of water at 58.60C into the calorimeter which already contains 100.0g of water at 19.30C. The final temperature of the water in the calorimeter is 38.70C. What is the heat
On a typical mission, the Space Shuttle (m = 2.00 106 kg) orbits at an altitude of 250 km above the Earth's surface. Find the speed of the shuttle in its orbit.
The temperature of the calorimeter increased to 54.080C. Calculate the ?H for the reaction. You may assume the butter is pure glyceril tristearate (C57H110O6).
When a 4.25g sample of solid ammonium nitrate dissolves in 60.00g of water in another insulating calorimeter the temperature drops from 21.0450C to 16.8700C. What is the (delta)H for the dissolution
Find the period of a child's leg as it swings about the hip joint. Assume the leg is 0.39 m long and can be treated as a uniform rod, Estimate the child's walking speed
The heat capacity of the calorimeter was 24.5J/0C and contained exactly 1250g water which increased from 24.620C to 27.430C. Calculate (Delta)U for the reaction in kJ/mol rxn
An FM radio station broadcasts electromagnetic waves at a frequency of 550 kHz. Calculate the wavelength of the waves.
A bomb calorimeter with an insulating heat capacity is used to burn 5.682g of a chocolate candy bar. If the 1.00kg of water in the calorimeter then increased from 18.0220C to 56.1250C, what is the U
Find an expression for the volume charge density ?(r) inside the ball as a function of r. Express your answer in terms of the variables Q, r, R, and appropriate constants
Calculate the standard molar enthalpy of formation of carbon dioxide from the following enthalpy changes. 2C(s) + O2(g) --> 2CO(g) [?H0 = -221.0kJ] and 2CO(g) + O2(g) --> 2CO2(g) [?H0= -566.0k
The temperature at which a substance melts or boils depends upon the strengths of the intermolecular forces. What must happen for a substance to melt in terms of particles, intermolecular forces, an
Calculate the ratio of the kinetic energy to the potential energy of a simple harmonic oscillator when its displacement is 1/8 its amplitude
Predict whether a reaction will occur in aqueous solution between the following pairs of substances. If a reaction does occur derive the net ionic equation. Specify the driving force : Precipitate f
Use the reactions below and their equilibrium constants to predict the equilibrium constant for the reaction, 2A(s) <-> 3D(g). 2A(s) <-> 1/2B(g) + C(g) K1 = 0.0334
Use the reactions below and their equilibrium constants to predict the equilibrium constant for the reaction, 2A(s) <-> 3D(g).