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Which element has an oxidation number of 7. A. Mn in MnO4- B. I in IO3- C. Fe in Fe2O3 D. Cl in ClO2
4 moles of an ideal gas have an initial temperature of 127 C. The temperature of the gas is kept constant and the volume is increases until the pressure drops to 40.0% of its original value. Calcula
When coal is burned, the sulfur present in coal is converted to sulfur dioxide (SO2), which is responsible for the acid rain phenomenon. S(s) + O2(g) ? SO2(g) If 1.64 kg of S are reacted with oxygen
When doing a sound experiment, you recorded the sound of a single frequency sound when it was stationary. What frequency did you hear as your friend rode away from you
A certain anesthetic contains 64.9 percent C, 13.5 percent H, and 21.6 percent O by mass. At 120°C and 750 mmHg, 1.00 L of the gaseous compound weighs 2.30 g. What is the molecular formula of th
A sinusoidal voltage %u0394v = (90 V) sin (170t) is applied to a series RLC circuit with L = 50 mH, C = 130 %u03BCF, and R = 44 %u03A9. What is the impedance of the circuit
Given the hypothetical redox reactions involving substances A, B, and C: A + B+ g? A+ + B C + A+ g? C+ + A B + C+ g? no reaction What is the arrangement of the substances in their order from stronge
A straight rod consists of a 2cm long piece of aluminum attached to a 3cm long piece of steel. calculate the change in length of the aluminum rod
The pressure of 6.0 L of an ideal gas in a flexible container is decreased to one-sixth of its original pressure, and its absolute temperature is decreased to one-forth of the original. What is the
A 200-N beam is held horizontally by a vertical steel cable at each end. The beam is 18 m long. A 650-N box sits 3.0 m from the left end. What is the tension in the right cable
A 2.0-kg mass moves with a speed of 5.0 m/s. It collides head-on with a 3.0 kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses after the collision
Monochromatic light (lambda = 670 nm) is incident on a single slit and forms a diffraction patter on a screen 95 cm away. what is the separation between the first-order minima
The volume of a gas is 2.80 L, measured at 1.00 atm. What is the pressure of the gas in mmHg if the volume is changed to 9.11 L
A plastic cylinder of length 38 cm its ends ground to convex (from the rod outward) spherical surfaces, each having radius of curvature 19 cm, How far will the image of the object lie from the right
How much heat is absorbed or released in the reaction of 20.0 g of NH3 with sufficient oxygen to produce NO(g) and H2O(l)? 4 NH3(g) + 5 O2(g) g? 4 NO(g) + 6 H2O(l) ?H = -1168 kJ A
A 1.0-cm-tall object is 7.5 cm in front of a diverging lens that has a 10 cm focal length. Determine the image height by making measurements on your diagram
A hydrogen atom is in its second excited state, n=3. Find the total energy of the atom
Calculate the change in internal energy for a system if a gas cools and releases 10.86 kJ of heat and expanded from 2.35 L to 22.86 L at 3.50 atm
We wish to coat a piece of glass (n=1.5) with a thin film (n=1.42) so that a maximum amount of light will be transmitted, what is the minimum thickness of the film in millimeters
A compound is 54.53% C, 9.15% H, and 36.32% O by mass. What is its empirical formula
A heat of 4.3*10^6KJ is req to convert a block of ice at -15deg C into water at 15deg C. What is mass of ice
What is the resulting pH when .005 moles of KOH is added to .1 L of buffer solution that is .100 M in H2PO4- and .100 m HPO4^2- and the Ka2 = 6.2x10^-8
A 58.0 %u03BCF capacitor is connected to a generator operating at a low frequency. The rms voltage of the generator is 5.00 V and is constant. at what frequency will the fuse burn out
A water pipe is having a 2.5cm inside diameter carries water into the basement of a house at a speed of 0.90m/s, what are the speed AND water pressure at the second floor
.28 moles of Br2 and .32 moles of CL2 are introduced into a 5.0 L container at 298 K calculate the equilibrium concentration of BrCl2