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The coating on the head of a match is highly flammable. When it burns, it releases a great deal of energy. However, before the match can burn, it must gain a small amount of energy from a spark. That spark is typically produced by striking (rubbing) the match head against a rough surface. Sketch and describe a potential energy diagram that represents the striking and burning of the match. Remember to label the diagram with the energy changes that occur. Your answer must include the potential energy diagram and a written description. (Note: you do not have to use actual energy values.)
What is the formula that relates the temperature change obsereved in a substance with the energy released or abosrbed? when you measure a temperature rise during a chemical reaction, is the reaction endothermic or exothermic?
The mass of a 150 ml beaker was determined to be 82.123 g. A sand- salt mixture was placed in the beaker and the mass of the beaker plus the mixture was determined to he 86.246 g.
The average kinetic energy of the molecules in a gas sample depends only on the temperature, T. But given the same kinetic energies, a lighter molecule will move faster than a heavier molecule.
Assuming that the volume of a solid or liquid was independent of the external pressure, we deduced that there was no change in the Gibbs free energy of a solid or liquid when the pressure is changed.
Treatment of A with aqueous H2SO4 and Hg(II) gives a single ketone, C, C10H16O. Oxidation of A with KMnO4 gives CO2 and the keto carboxylic acid D shown below. Propose a structure for A.
Chlorine exists primarily as 37Cl as well as 35Cl and has an average atomic weight of 35.453. The abundance of Cl with atomic weight of 35 is
Explain what types of chemical compounds describe Trimyristin and its soaps. Explain what happens to the Trimyristin if ethyl ether is evaporated rapidly (>60deg. C)
The Ksp for AgCl = 1.8x10^-10, @25 degrees Celsius. If the goal is to harvest silver ions from a film stop bath, and the plan is to get the silver ion concentration down to 18x10^-12 M, using NaCl, what concentration of Cl- ion, in M is required
The specific heat of calcium metal is 0.653J/gK. How much heat, in joules, is required to heat a 58.5 gram sample of calcium from -5.2oC to 16.7oC. Enter your answer in scientific notation with no units.
What is the concentration (in M) of the chloride ion when 16 mL of a 0.625 M solution of sodium chloride is combined with 17.3 mL of a 0.551 M solution of iron(III) chloride to a final volume of 56.5 mL
When a 8.26-g sample of gaseous hydrogen bromide dissolves in 36.2 g of water in a coffee-cup calorimeter (see above figure) the temperature rises from 25.00 oC to 71.53 oC. Calculate H in kJ/mol HBr for the solution process.
Explain how do we turn calcium hydroxide + nitric acid into molecular and net ionic equations. Could you as well be specific as to the physical state of each piece of the equation as well as tell us why it is the way it is
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