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Calculate DE, and determine whether the process is endothermic or exothermic for the following cases:
(a) A system releases 43 kJ of heat to the surroundings and has 665 kJ of work done on it by the surroundings.
DE = kJ. This process is.
(b) q = 35 kJ and w = -287 kJ.
(c) A system absorbs 246 kJ of heat from the surroundings and has 766 kJ of work done on it by the surroundings.
The chemical 5-amino-2,3-dihydro-1,4-phthalazinedione, better known as luminol, is used by forensic scientists in analyzing crime scenes for the presence of washed-away blood.
hours in the presence of a certain concentration of an acid catalyst, what is the half-life for this reaction under the same conditionns? (Rate = k[C12H22O11]
One ecologically important equilibrium is that between carbonate and hydrogencarbonate (bicarbonate) ions in natural water. (a) Th e standard Gibbs energies of formation of CO3
George is measuring pH in a lab where the temperature is 58 C. If the pH goes up by one pH unit, what will be the change in mV of his glass electrode?
If I put a methanol solution of m-THPC into a 10.0 mm pathlength cuvet, and observe an absorbance of 0.132 (no units) at 652 nm, what is the concentration of the solution? (Assume there are no other solutes present in the methanlo.
A sample of sodium reacts completely with 0.142kg of chlorine, forming 234g of sodium chloride. What mass of sodium reacted?
Calculate the pH at the equivalence point for the titration of 0.200 M methylamine (CH3NH2) with 0.200 M HCl.
The reaction previously done was just having trans-cinnamic acid reacted with Br2 forming all the isomers with the double bond being broken and Br put into place.
Aspirin that has been stored for a long time may give a vinegar odor and give a purple color with FeCl3, what reaction would cause this to happen
If 120.9 mL of water is shaken with a gas at 0.860 atm, it will dissolve 0.00286 g of the gas. Estimate the Henry's law constant for the gas in water in units of g L-1 atm-1.
would be decomposed by a complete reaction with one drop of water? Assume that 1 drop ~ 0.05 mL. If you started with 0.4 g of trityl fluoborate, how much of it would have been left?
From the composition of lignite coal, calculate the mass of sulfuric acid that could potentially form as acid rain from burning
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