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Vitamin D3 Vitamins are chemicals required by humans in small amounts and are not made within our bodies. Such chemicals must therefore be acquired from ones diet.
A sample containing carbon, oxygen, and an unknown element isplaced in a mass spectrometer. What is the mass of the unknown element
What fraction of piperazine (perhydro-1,4-diazine) is in each of its three forms (H2A, HA-, A2-) at pH 8.44
A system of 1402 particles, each of which is either an electron or a proton, What is the mass of this system
A projectile is shot from the ground at an angle of 55 degrees with respect to the horizontal,find the horizontal component and the vertical component of initial velocity
Many power plants produce energy by burning carbon-based fuels, which also produces carbon dioxide. Carbon dioxide is a greenhouse gas, so over-production can have negative effects on the environmen
Why do use slightly different amounts of acids (HCL and NaHSO4) from the amounts of base (NaOH). In what order should you mix the acid and base
Assuming the mixture has the same specific heat (4.184J/goC) and density (1.00 g/cm3 or 1.00 g/mL) as water, calculate the heat (in J) transferred to the surroundings, qsurr.
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