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Does doubling the decibels of a sound intensity level double the intensity? Explain. Why is lightning seen before thunder is heard? Under what circumstances would sound have
(a) a Doppler "blueshift" and
(b) a Doppler "redshift"?
the reaction of potassium in water is extremely exothermic, what would be the problem with adding a large piece of potassium to a small amount of water?
Question- Calculate the value of Keq at 298 K for each of the following reactions
calculate the ph of the solution that is 0.20M hydrofluoric acid and 0.040 M Lithium fluoride. the Ka for hydrofluoric acid is 3.5*10^-4.
What is the volume in mL of 7.27 g of acetone?
The specific heat of mercury metal is 0.138J/gK. How much heat, in joules, is required to heat a 71.5 gram sample of mercury from -6oC to 54.4oC? Enter your answer in scientific notation with no units.
What volume of liquid ethanol (in L) (d = 0.785 g/mL) would need to evaporate to provide an equilibrium vapour pressure (59 mm Hg at 25oC) in a room with dimensions 2.81 m x 2.43 m x 2.50 m
Problem 1: The experimentally determined rate law for the following reaction indicates that the reaction is second-order in AB and that the reaction is second-order overall.
the normal boiling point for a solutionof n-hexane c6h14 m 86.18 gmol and n-octane c8h18 m 114.23 gmol is t 93.7
Your stock solutions are 20% glucose, 1M tris and 0.5M EDTA. The diluent is distilled water. Determine how much of each you will add to make the desired buffer.
Question- Besides birth control pills, and "rhythm" method, what is another method of contraception and discuss how the method works to prevent pregnancy, at the physiological method, and any positive and negative side-effects.
Suppose that you have 0.500 L of each of the following solutions, and an unlimited supply of water. (Note: C9H7NHBr is a salt containing the ions C9H7NH+ and Br
system and show how the pH will change upon addition of 10.0 mL each of ) 0.10 M of HCl or NaOH. Use any combination of weak acid and its salt OR weak base or its salt.
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