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Describe the differences between physical change and chemical change in a material. Use examples related to the fire service to illustrate physical change and chemical change. Must be 300 words.
The rate constant increases by a factor of 2.00 when the temperature is increased from 80 C to 115 C. estimate the arrhenius activation energy.
A sample of sodium reacts completely with 0.142kg of chlorine, forming 234g of sodium chloride. What mass of sodium reacted?
SO2 and O2 react together to form SO3. The resulting reaction mixture is an equilibrium involving all three compounds. Which of the following changes will cause the equilibrium to shift to the left
The indicator methyl orange has a pKa of about 3.5. Its acid form is red; its basic form is yellow. What color is the indicator at pH = 7
The osmotic pressure of solutions of polystyrene in toluene were measured at 25?C and the pressure was expressed in terms of the height of the solvent of density 1.004 g cm-3.
what is the mass in grams of solid sulfur,S8 required to produce 25.50g of Cu2S(s) according to the balanced equation.
The radius of an atom of gold (Au) is about 1.35 Angstron. (a) Express this distance in nanometers, and in picometers. (b) how many gold atoms would have to be lined up to span 1.0 mm? (c) if the atom is assumed to be a sphere, what is the volume ..
Carbon dating is a well-calibrated radiometric dating system used for items generally younger than 50,000 years old (14 C has a half-life of 5730 years).
The expression for the reversible work is wtwist= CL/2 (\phi /L)2. A DNA oligomer, 20 base pairs in length, undergoes a twisting deformation of 36 degrees in order to bind to a protein. Calculate the reversible work involved in this twisting defor..
A water sample contains 204 mg of CaSO4 per liter. Calculate the hardness in terms of CaCO3 equivalents
A 2.00 L sample of air at -50 degreees C has a pressure of 700 torr. What will be the new pressure in torr if the temp is raised to 50 degrees C and volume is increaed to 4.00 L
The solubility of pure nitrogen in water at 1 atm and 25 degress Celsius is 6.8E-4 M. Calculate the concentration of nitrogen in water under atmospheric conditions where the partial pressure of nitrogen is 0.78 atm.
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