Describe why removing air among the walls reduces
A thermos is a container with vacuum among its inner and outer walls. Describe why removing air among the walls reduces the heat exchange between the contents of the thermos and surroundings.
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Explain what mass of it is required to lower the melting point of 5.2 kg of ice to -4.2 degrees Celsius, assuming that NaCl dissolves totally and produces an ideal solution,?
Discuss is the compound an electrolyte or not? If it is an electrolyte, determine the numbers of ions does the compound produce? Where the value of R = 0.0821Latm/oC-mol.
By mixing the 2.17g of an unknown non-electrolyte a solution is prepared with the 225.0g of chloroform. The freezing point of the mixture is -64.1g Celsius, while the freezing point of chloroform is-63.5 Celsius.
Plot points and make possible sketch of graph off on interval [-6,6]. Find smallest critical number of critical points in interval? Describe.
In what two ways might the presence of significant amounts of benzoic acid impurity be harmful to the benzoic condensation if the Benzaldehyde is easily oxidized to benzoic acid by oxygen in the air?
Estimate the first-order rate constant for its decay, in units of years -1 when the Carbon-14 is a radioactive isotope which decays with a half-life of 5730 years.
Discuss how long will it take the concentration of A to drop from the 0.75 M to0.25 M when the rate constant for the reaction 3A ® 4B is 6.00 ´10 -3 L mol -1min -1.
Starting with 1.00 ´ 10 20molecules of reactant at time t = 0, a first-order reaction has a half-life of 20.0 minutes. Determine the numbers of molecules remain un-reacted after the 100.0 minutes?
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