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Which one of these equations describes a redox reaction? 2Al+3H2SO4(aq)-->Al2(SO4)3(aq)+3H2(g), 2KBr(aq)+Pb(NO3)2(aq)-->2KNO3(aq)+PbBr2(s), CaBr2(aq)+H2SO4(aq)-->CaSO4(s)+2HBr(g), H+(aq)+O
How did this war affect American sensibilities, including the way Americans viewed the war and themselves and did the war change America's role in the world? Explain your answer.
A cannon tilted up at a 26 degree angle fires a cannon ball at 71m/s from atop a 12m -high fortress wall
What is the pH of a 0.440 ammonia solution? with the kb value of 1.8*10^-5 What is the percent ionization of ammonia at this concentration. Express the percentage numerically to three significant f
Explain about health information systems and describe clinical information systems, management, strategic decision support, and e-health applications.
In the winter sport of curling, players give a 20kg stone a push across a sheet of ice. How much force does the curler exert on the stone
A mixture of 3.0 g of 1,1-diphenylethylene and 100 mg of sulfuric acid was heated for 2 hours. Upon cooling, 2.2 grams of crystalline 1,1,3,3-tetraphenyl-3-methyl-1-butene precipitated from the mixt
A 46g marble moving at 2.3m/s strikes a 24g marble at rest. What is the speed of the first marble immediately after the collision
In an amusement park water slide, people slide down an essentially frictionless tube. Does the mass of the person make any difference
Given a column of air with a pressure of 1.57 x 10^5 Pa and an area of 1.12 m^2 and given that the acceleration due to gravity is 9.8 m/s^2, what is the mass of this column
A 15 kg block is accelerated at 1.7 m/s2 up a frictionless plane inclined at 5.0° to the horizontal, find the change in the block's mechanical energy
A mixture of 0.160 moles of C is reacted with 0.117 moles of O2 in a sealed 10.0L vessel at 500.K, producing a mixture of CO and CO2. The total pressure is 0.640 atm. What is the partial pressure of
A reaction mixture initially containing 0.520 M H2S and 0.520 M SO2 was found to contain 1.0 x 10 -3. A second reaction mixture at the same temperature initially contains 0.245 and 0.335. calculate
If a water sample has a phosphate concentration of 2.0 x 10-6 M, at what calcium ion level will a precipitate of Ca3(PO4)2 begin to form if the Ksp = 1 x 10-25
Construct a buffer to have a pH of 7.70 using HClO and NaClO (Ka = 3 x 10-8). How many grams of NaClO must be added to 1.0 L of a 0.40 M HClO solution
A 16 g bullet strikes and becomes embedded in a 1.10 kg block of wood placed on a horizontal surface just in front of the gun. what was the muzzle speed of the bullet
Benzoic acid dissociates in water: C6H5COOH + H2O ==== H+ and C6H5COO- The pKa of this reaction is 4.2. In a 0.53 M solution of benzoic acid, what percentage of the molecules are ionized
Light moving from glass to air changes wavelength from 448.5 nm to 653.7 nm. find the frequency of the light in air
A person in a rocking chair completes 15 cycles in 17s, What are the period of the rocking
Based on the chemistry of an ion-exchange chromotography describe how you will calculate Mpc for your water samples.
The normal boiling points of CO and SO2 are -192c and -10c, respectively. a) At 25c and 1 atm, which gas would you expect to have a molar volume closest to the ideal value
Draw the major organic product formed by reaction of 3-hexyne with the following reagent: Cl2 (1mol)
Four equal point charges of +3.0 uC are placed in air at the our corners of a square that is 40cm on a side. find the force on any one of the charges
Lactic acid (C3H6O3) which occurs in sour milk and foods such as sauerkraut, is a weak monoprotic acid.? The pH = 0.10 M solution of lactic acid is 2.43 What are the values of Ka and pKa for lactic
A negative charge -0.550 µC exerts an upward 0.600 N force on an unknown charge 0.210 m directly below it. What is the unknown charge (magnitude and sign)