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A sample is composed completely of gold and is absolutely free of impurities. Which term or terms could be used to describe this sample of gold? Check all that apply. mixture heterogeneous mixture homogenous mixture solution pure chemical substance compound element
if a saturated solution of NH4NO3 at 70 degrees Celsius was cooled to 10 degrees Celsius, how many grams of solute will separate if the quantity of the solvent is 98 grams?
Which of the following constants is/are needed to calculate the amount of energy required to heat 30.5g of H2O(s) at -25.0 degreeC to H20(L) at 5.0 degreeC?
The black silver sulfide discoloration of silverware can easily be removed by heating the silver article in a sodium carbonate solution in an aluminum pan.
Determine which H atom transition (ninitial,nfinal) was responsible for the emission of a photon with a frequency of 6.91 x 1014 Hz.
The Delta H for this reaction is 54.8 kJ. How much energy would be absorbed if 24.7 g of NH_4Cl reacts?
What is the boiling point of a mixture composed of 85 g HOCH2CH2OH (ethylene glycol) and 125 g H2O? The boiling point elevation constant for H2O is 0.512 °C/m.
Why is the peroxide anion such a strong oxidizing agent and describe qualitatively how the conclusions of Bohr and Rydberg are essentially the same?
Construct a reaction table for the process, and use it to calculate Kc at this temperature.
Calculate the radius of iridium (Ir) atom given that Ir has FCC crystal structure, a density of 22.4 g/cm³ and atomic weight of 192.2 g/mol
For the unbalanced equation Cl2 ++ KI = I2 + KCl - how many moles of the second reactant would be require to react exactly with the 0.275 mole of the first reactant
what is a cyanide based compound used in synthesis of methadone?
Rubidium has two naturally occurring isotopes: Rb-85 with mass 84.9118 amu and a natural abundance of 72.17%, and Rb-87 with mass 86.9092 amu and a natural abundance of 27.83%.
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