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Energy is classified as potential or kinetic. Potential energy is energy that is stored in an object, a rubber band for example. You stretch the rubber band and release it flying through the air. Once the rubber band is in motion it exhibits kinetic energy. A parked car, a child playing with a yo-yo and a calculator exhibit which type of energy?
The human body obtains 1091 kJ from a candy bar. If this energy were used to vaporize water at 100°C, how much water in liters could be vaporized? (Assume that the density of water is 1.0 g/mL.)
Suppose 2 atm of SO2 reacts, what will be the resulting pressures? Suppose 2 atm of SO2 reacts, what will be the resulting pressures?
How many grams of NaOH would you need to prepare 500mL of a 1M solution (assume 100% purity of the base)? M= (# of moles / L of solvent)
You obtain an unknown acid. You weigh out .856 grams of it and dissolve it in 45mL of water. You titrate it with 27.4mL of .5 M NaOH. What is the equivalent weight of the unknown acid
A buffer is prepared by combining 25 mL of .50 M NH3(aq) with 25 mL of .20 M HCl. What is the pH of the buffer? (Ka(NH4^+)=5.6 x 10^-10)
Aqueous ammonia is commercially available in a solution that is 28% (w/w) ammonia. What is the mole fraction of ammonia in such a solution
A solution of ammonia and water contains 2.70×1025 water molecules and 8.50×1024 ammonia molecules. How many total hydrogen atoms are in this solution
Provide an expression for the relative probability of finding a population of particles in the box in the second excited state relative to the ground state at 10000K
A solution of NaOH(aq) contains 8.7 g of NaOH(s) per 100.0 mL of solution. Calculate the pH and the pOH of the solution at 25 °C.
Draw the correct molecular geometries of the following covalent compounds. Use the electronegativity differences between the atoms in each bond pair to determine the presence and direction of individual bond dipoles in each molecule.
Add 1mg of alcohol dehydrogenase. Assuming all of the ethanol is converted to acetaldehyde, what will the final concentration of NADH be in the solution
effuses through a hole in a plate in the same amount of time it takes 20.54 mL of another gas to effuse through the same hole under the same temperature and pressure conditions. Determine the molar mass of the unknown gas.
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