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(a) Explain pure lead melts at 327oC and pure tin melts at 232o C, yet while we make an alloy of lead-61.9 wt% Sn it melts at a much lower temperature of 183oC, explain.
(b) Explain pure lead freezes at one constant temperature of 327oC, yet the lead- 30 wt% Sn alloy freezes over a 60 oC temperature range, explain.
calculate the quantity of heat produced when 19.0g of propane is completely combusted in air under standard conditions. Assume that liquid water is forming.
Iodine-131 is a radioactive isotope. After 4.00 days, 70.8% of a sample of 131I remains. What is the half-life of 131I
Compare solutions 2 and 4. How does the common-ion effect influence the pH of solution 4. Please explain fully, and calculate the expected pH of each of these solutions.
The specific heat capacity of silver is 0.240 J/(g x degrees C). Calculate the energy (in kJ) required to raise the temperature of 263 g Ag from 273K to 278 K.
what is the hydrogen ion concetration of a solution that has a pH of 4.7
calculate the pH of a solution formed by mixing 65 mL of .27 M NaHCO3 with 75 mL of .12 M Na2CO3
Prolonged exposure to mercury (Hg) vapor can cause neurological disorders and respiratory problems. For safe air quality, the concentration of mercury vapor must be under 0.050 mg/m3. Convert this number to g/L.
What is the specific heat of a substance that requires 124 J to raise temperature of 95.5 g from 20.0 degrees celsius to 25 degrees celsius?
Calculate the molality of a 0.052 M solution of ethyl alcohol in water at 25 degree Celsius. (assume the density of the solution at such low concentration is equal to that of water at 25 degree Celsius,0.997 g/mL.)
In the column chromatography portion of an experiment, a student uses different solvents or solvent mixtures to elute the column for separation of your product mixture.
Although the double bond, in total, is stronger than a single bond, the pi bond itself is weaker and can react with electron-deficient species such as a hydrogen ion.
Hard water contains alkaline earth cations such as Ca2+ which reacts with CO32- to form insoluble deposits of CaCO3. Will a precipitate of CaCO3 form if a 250mL sample of hard water having [Ca2+] = 8.0x10-4M is treated with the following
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