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Given a stock solution of a food dye having a concentration of 1.0 x 10-5 and an absorbance of 0.700. If a new solution is made by diluting exactly 10.0 mL of the solution with exactly 15.4 mL of di
Examine a particular application of thin film technology. Optical coatings(UVblock, anti---reflection, reflective...). Friction and wear coatings
Sn2 reactions occur at different rates depending on the structure of the substrate in the reaction. Would an Sn2 reaction occur at a faster rate on a primary or a tertiary substrate ? Briefly, Expla
Akyl halides tend to be relatively non-polar covalent compounds. They dissolve in non-polar solvents but are insoluble in water.
Consider the halide ions as nucleophiles. Briefly explain why F-, the strongest base among the halide ions, is the best nucleophile in polar aprotic solvents while iodide the weakest base is the best
Suppose that angles measure 2x and 4x+6 are supplementary. What are the measures of the angles? ( in Degrees)
The combustion of propane illustrated by the following reaction releases 2428 KJ per mole of reaction. A sample of propane is burned at 59 degrees celsius and 746 mm Hg. The process produces 39.7 L
The boiling point of methanol (CH3OH) is 64.7 oC and delta H vap = 71.8 kJ/mol. What is delta S for the vaporization of 2.15 mol of CH3OH at 64.7 oC?
Find a function s given by s(t) = a cos ?t that models the displacement of the weight. Evaluate s(1). Is the weight moving upward, downward, or neither when t = 1
Find the energy the person expends pulling the crate, the amount of energy converted to heat via friction, and the increase in the kinetic energy of the crate.
Write the expression in terms of a single trigonometric function:
Using conservation of energy, find the velocity of the roller coaster at a height of 5 m above the ground. Sketch the problem before you solve it.
Calculate the number of moles of ammonia absorbed by a boric acid solution if 3.25 ml of 0.0025 M H2SO4 were needed to titrate the solution to the end point ( Assume both hydrogens of the sulfuric a
A 40,000 kg railroad car initially traveling at 10 m/s collides inelastically with a 20,000 kg railroad car intially at rest. The cars stick together. What is their final speed?
A surveyor wishes to find the distance between 2 inaccessible points, P and Q, on opposite sides of a lake. From point R, he finds the distance to P is 32670 yards and Q is 49468 yards. If the angl
Question: A 50.00-mL solution of 0.0350 M ammonia (Kb = 1.8 × 10-5) is titrated with a 0.0152 M solution of hydrochloric acid as the titrant. What is the pH at the equivalence point? (Kw = 1.0
First, provide a sketch of this problem. Then, find the gravitational potential energy of the box relative to the floor, and the gravitational potential energy of the box relative to the ledge.
Sketch a free body diagram showing the forces acting on the crate and find the energy the person expends pulling the crate, the amount of energy converted to heat via friction.
How many milliliters of 0.100 mol of KOH solution are needed to completely neutralize the HCl in 300 mL of a hydrochloric acid solution that has a pH of 2.25?
Washing soda is often added to detergent formulations to make the wash water more basic. What is the formula of the NONHYDRATED form of washing soda? Does it increase or decreased the pH of the was
If the equilibrium concentrations of CO and CH3OH are 1.18 M and 1.84 M, respectively, What is the equilibrium concentration of H2?
One angle of a triangle is 34 degrees. The oppisite side is 20mm and a second side is 27mm. Find all possible values for the third side of the triangle.
Given y = 2 sin (2p x + 1), find the amplitude, the period, and the phase shift. Given y = - 3 cos (4x - p) + 2, find the amplitude, the period, and the phase shift.
Balance the following reaction, which occurs in acidic aqueous solution, using the smallest possible integer coefficients and adding H+ and H2O as necessary:
Describe how knowledge of the Ash borer's ecology and behavior are helping to control infestations of this non-native species. All of this costs money. As a citizen, do you feel that it is worth