Block falls from rest from the top
A block falls from rest from the top of a 178-m-high building. When the block is 58.0 m above the ground, a man, 1.90 m tall, standing directly underneath, sees the block. How much time does he have to react to avoid being hit?
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Given that the cuvette used in the measurement has a pathlength of 1.00 cm, determine the extinction coefficient of compound A at 460 nm.
You are given pure samples of ethane, C2H6(g), and toluene, C7H8(l). What prediction would you make concerning their standard molar entropies at 298 K?
What volume of sodium thiosulfate and water are needed to make an approximate 0.10 M solution starting with 1.0 M sodium thiosulfate solution?
An absorbance of 0.395 at 460 nm is measured for a solution of compound A with an unknown concentration. If the same sized cuvette is used, what is the concentration of compound A in this solution?
The second -order decomposition of NO2 has a rate constant of 0.255 M-1S-1. How long will it take for 75% of NO2 to decompose if the initial concentration of NO2 is 1.33M?
Calculate the amount of heat liberated (in kJ) from 421 g of mercury when it cools from 91.0°C to 11.0°C.
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 100.0 mL of HNO3. The Kb of NH3 is 1.8 × 10-5.
Given the absorbance spectrum of compound A below. At what wavelength does compound A most strongly absorb visible light?
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