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The weights are then interchanged and balance is again achieved by shifting the pivot point to the 43 cm mark. Determine the mass of the meter stick and the position of its center of gravity.
When a 0.269 g. sample of a barium compound was treated with excess H2SO4, 0.0891g of BaSO4 produced. Barium can be analyzed by precipitating it as BaSO4 and weighing the precipitate.
Determine the standard enthalpy change of the detonation reaction when the standard molar enthalpy of formation for TNAZ (C3H4N4O6) has not been measured, vat has been calculated to be ΔH f=+
Illustrate that if m = u/v is rational number in D then Q_{m} will be rational point of form (a/c, b/c) with a >= b. Determine the formula for each of numbers a, b, c in terms of m.
Using the hydrochloric acid a 5.00 mL sample of barium hydroxide is titrated to the phenolphthalein endpoint. The five mL sample needs 18.02 mL of 0.0873 M HCI solution to reach the endpoint.
A puck having mass 0.20 kg approaches a second, similar puck that is stationary on frictionless ice. The original speed of the moving puck is around 6.0 m/s.
What could you change about the experiment to resolve (separate) these two spots next time? Imagine that after developing the TLC plate, you see that two result spots (from the same solution) are ov
The combustion of butane produces heat according to the equation: Determine the heat of combustion per gram of butane.
A model-train car having mass 225 g traveling with the speed of 0.50 m/s links up with the other car of mass 445 g which is initially at rest. Determine the initial kinetic energy. Determine the fin
Explain how could you use a precipitation reaction to separate each of the following pairs of cations? Write down the formula for each reactant you would add, and write down a balanced net ionic equ
A model rocket engine consists of an average thrust of 5.26 N. It consists of an initial mass of 25.9 g, which comprises fuel mass of 13.5 g. The period of its burn is around 1.90 s. (Suppose that
Determine (i) average number of computers waiting for adjustments? (ii) average number of computers not in working order? (iii) probability system is empty? (iv) average time in quere? (v) average t
Supposing that this star is basically at the edge of the galaxy, each of the stars in the galaxy consists of a mass identical to that of the star and the stars are distributed equally in a sphere ab
A 250.0-gram sample of a white solid is known to be a mixture of BaCl2, KNO3, and NaCl. When 100.0 g of this mixture is dissolved in the water and allowed to react with excess H2SO4
If two identical ions are apart by a distance r = 6.2 Å, the repulsive electric force which each applies on the other is 5.40 x 10-9 N. Determine how many electrons were eliminated from the neu
How can identify the substance oxidized and the substance reduced? Find out the oxidizing agent and the reducing agent.
A seismographic station obtains S and P waves from an earthquake, separated in time by 15.8 second. Suppose that the waves have traveled over the similar path at speeds of 4.50 km/s and 8.20 km/s. D
The half-life of H2O2 at 298 K was found to be 0.41 s, while that at 1000 K was 0.07 s. estimates the Arrhenius activation energy
When two fire-crackers generate a sound level of 95 dB if fired simultaneously at a certain place, then what will be the sound level when only one is exploded?
Assume that quality control at an aspirin manufacturing plant fell down on the job and left some aspirin tablets to be sold that contained salicylic acid, explain what might happen to perso
An aqueous stock solution ("S") which is having 8.657 mg of gallium (Ga) per mL of solution is diluted in the following manner. A 3.00 mL aliquot of this solution is added to a 150.00 mL volumetric
A gas-filled balloon having a volume of 3.00 L at 1.2 atm and 25°C is allowed to rise to the stratosphere, where the pressure and temperature are 3.00 x10-3 atm, -23°C resp
Determine the delta E for this reaction? Suppose the reaction goes to completion. If 3 moles of H2 react with 3 moles of Cl2 to form HCl, determine the work done (in joules) against a pressure of 1.
The point (x, y) is the integer ponit on the unit cirlce of x and y are integers with x^2 + y^2 = 1. The point is rational point if x and y are rational numbers satisfying with x^2 + y^2 = 1.
Give brief but clear explanations for the observed conductivities for parts c, d, and e on the basis of your net ionic equations.