Heat Capacity

A piece of chrominum metal with a mass of 24.26g is heated in boiling water to 98.3C and then dropped into a coffee-cup calorimeter containing 82.3g of water at 23.3C. When thermal equilibrium is reached, the final termperature is 25.6C. Calculate the specific heat capacity of chromium. ______________ You determine that 187 J of heat is required to raise the temperature of 93.45g of silver from 18.5 to 27.0C. What is the specific heat capacity of solid silver? __________________

Wavelength questions

You are an engineer designing a switch that works by the photoelectric effect. The metal you wish to use in your device requires 6.7x10 (to the -19 power. J/atom to remove an electron. Will the switch work if the light falling on the metal has a wavlength of 540nm or greater? Why or why not? Radiation in the ultraviolet region of the electromagnetic spectrum is quite entergetic. It is this radiation that causes dyes to fade and your skin to burn. If you are bombarded with 1.00 mol of photons with a wavelength of 375nm, what amount of energy (in kilojoules per mole of photons) are you being subjected to? What is the shortest wavelength photon an excited H atom can emit? Explain br... click for more

Wavelentgth, Quantum numbers questions

If energy is absorbed by a hydrogen atom in its general state, the atom is excited to a higher energy state. For example, the excitation of an electron from the level with n=1 to the level n=3 requires radiation with a wavelength of 102.6 nm. Which of the following transitions would require radiation of longer wavelength then this? a) n=2 to n=4 b) n=1 to n=4 c) n=1 to n=5 d) n=3 to n=5 Quantum numbers a) When n=4, l=2, and m= -1, to what orbital type does this refer? (Give the orbital label, such as 1s.) b) How many orbitals occur in the n=5 electron shell? How many subshells? What are the letter labels of the subshells? c) How many orbitals occur in an f subshell? What are... click for more

Electronic Configuration

Write the electron configurations for Mg and Ar, using both the spdf notation and orbital box diagrams. Describe the relation of the atom's electron configuration to its position in the periodic table. electron configuration for Mg___________ spdf____________________ orbital box diagram: electron configuration for Ar_________________ spdf_______________________ orbital box diagram: Describe the relation of the atom's electron configuration to its position in the periodic table:

Rate Laws

The reaction A + B --> Products us a second order reaction that is first order with respect to A and first order with respect to B. The reaction takes place in aqueous solution at 25 degrees Celsius. When [A] = 0.563 mol/L and [B]= 0.740 mol/L, the rates of disappearance of A and B are 0.00245 mol/L/min. What will be the rate of disappearance after the following changes at 25 degrees Celsius: to 100.0 mL of the reaction mixture is added 100.0 mL of pure water; and, to 50.0 mL of the reaction mixture is added 100.0 mL of pure water?