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Would you expect smelling salts to work as well on a cold winter day as on a warm summer day? Explain your answer.
What is the name of the product for the pinacolone + piperonaldehyde + KOH reaction? It's a mixed aldol condensation reaction. I was able to come up with the product structural formula but not the
A rowboat crosses a river with a velocity of 3.46 mi/h at an angle 62.5° north of west relative to the water. The river is 0.685 mi wide and carries an eastward current of 1.25 mi/h. How far ups
The partial pressure of 222Rn was 1.2 10-6 mmHg. Calculate the number of 222Rn isotopes (t1/2 = 3.8 d) at the beginning and end of 27 days.
We want to launch the package in such a way that it will never come back, and when it is very far from the asteroid it will be traveling with speed 218 m/s. We have a large and powerful spring whose
Heat is lost to the styrofoam calorimeter. Assuming a 6.22 C temperature change for the reaction of HCl(aq) with NaOH(aq), calculate the heat loss to the inner 2.35-g styrofoam cup. The specific hea
A calorimeter contains 32.0 of water at 15.0. When 2.50 of (a substance with a molar mass of 52.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 26.0. Ca
A car crashes into a wall at 60 m/s and is brought to rest in 0.1 s. Calculate the average force exerted on a 80 kg test dummy by the seat belt.
Many cigarette lighters contain liquid butane)Using enthalpies of formation, calculate the quantity of heat produced when 3.80 g of butane is completely combusted in air under standard conditions.
Two 2.00L flasks, one of which contains 0.250 mole O2 gas at 50.0 deg C. In which flask is the ratio of molecular volume to sample volume greater?
There is a region of magnetic field. from a centre point from it there are 2 semi infinite wire making some angle the region is having rdius r. what will be the magnetic field intensity at that cent
A 0.041 M solution of a monoprotic acid is 12 percent ionized. Calculate the ionization constant of the acid.
Rubidium-87 decays by beta decay with a half-life of 4.9 x 10^10 yr. How many 87Rb atoms are in a moon rock sample that has a rubidium decay rate of 3500 disintegrations per hour.
An aqueous solution contains 4.90% NH3 (ammonia) by mass. The density of the aqueous ammonia is 0.979 g/mL. What is the molarity of NH3 in the solution?
A 0.264-gram sample of an amino acid was dissolved in 95.0mL of water and titrated with 0.105M NaOH. The first equivalence point was found at V(OH)=16.3mL. What is the molar mass of the amino acid t
A rifle is aimed horizontally at a target 51.0m away. The bullet hits the target 2.50cm below the aim point. a) What was the bullets flight time? b) What was the bullets speed as it left the barrel?
Consider the following reaction: K2S(aq)+ Co(NO3)2(aq) - 2 KNO3(aq) + CoS(aq) What volume of 0.225 M K2S solution is required to completely react with 175 mL of 0.115 M Co(NO3)2?
A 1.43-L flask is filled with propane gas (C3H8), at 1.00 atm and -23.0°C. What is the mass of the propane in the flask?
A 350 N child is in a swing attached to ropes 1.75m. Find the gravitational PE associated with the child relative to her lowest position when the ropes make a 30 degree angle with the vertical.
Two packing crates of masses m1 = 10.0 kg and m2 = 4.50 kg are connected by a light string that passes over a frictionless pulley as in the figure below. The 4.50 kg crate lies on a smooth incline o
Calculate the total entropy change for the contents of the bath (ice, water, and nickel). NOTE: enthalpy of fusion of ice = 334. J g-1. Specific heats at constant pressure: nickel, 0.46 J K-1 g-1.
However, after the crate is in motion, a horizontal force of 59 N is required to keep it moving with a constant speed. Find the coefficients of static and kinetic friction between crate and floor.
A solution was made by taking 1.250g of KMnO4 and dissolving it in enough water to make 1.000 liter of solution. How many mL of this solution are required to titrate a 0.480 g sample of H2C2O4·
The Base composition for one of the strands of the DNA double helix is 25%A, 35%C, 18%G, and 22%T. What is the percent base composition for the other strand of the DNA double helix?
A space station, in the form of a wheel 127 m in diameter, rotates to provide an "artificial gravity" of 4.00 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of th