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If the temperature of a gas is increased from 20 to 40 degrees celcius, by what factor does the speed of of the molecules increase?
A chemist needs to determine the concentration of a solution of nitric acid HNO3, She puts 865mL of the acid in a flask along with a few drops of indicator. She then slowly adds 0.600M Ba(OH)2 to the flask until the solution turns pink, indicating..
Calculate the number of moles of ions present in 66.8 g of a solution that is 2.11% Fe(NO3)3 by mass.
The silicon in the plate is a mixture of naturally occurring isotopes. One of the those isotopes is silicon-30, which has an atomic mass of 29.97376 and a percent natural abundance of 3.10.
This question has two parts: Given that Ka for HF is 6.3 x 10^-4 at 25 degrees C, what is the value of KB for F- at 25 degrees C? and Given that Kb for CH3CH2NH2 is 6.3 x 10^-4 at 25 degrees C, what is the value of Ka for CH3CH2NH3+ at 25 degrees ..
write molecular, complete ionic, and net ionic equations for the reactions that occur, if any, when solutions of the following substances are mixed? a. nitric acid and potassium carbonate
When 24.0 g of glucose (a nonelectrolyte) are dissolved in 500. g of water, the solution has a freezing point of -0.47°C. What is the molar mass of glucose? Kf of water is 1.86°C/m.
Give the number of d-electrons associated with the central metal ion in each of the following complexes: K3[Fe(CN)], [Mn(H2O)6](NO3)2, Na[Ag(CN)2], [Cr(NH3)4Br2]ClO4, [Sr(EDTA)]2-
Reactivity of monosaccharides. Give the fate (what happens to) an aldose monosaccharide in the presence of a weak oxidizing reagent (oxidation reaction). Give the fate of (what happens to) a ketose monosaccharide in the presence of H2 and a Pt cat..
a flask contains 22.5 g of an unknown liquid initially at 14.0oc. after 2.34 kj of heat are added to the liquid its
A 45.9-mL sample of gas in a cylinder is warmed from 22 C to 80 C. What is its volume at the final temperature? (Assume constant pressure.)
Which of the following elements would you expect to gain electrons in chemical changes
A zero-order reaction has a constant rate of 1.60×10-4 . If after 35.0 seconds the concentration has dropped to 2.50×10-2 , what was the initial concentration?
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