A ground state hydrogen atom absorbs a photon of wavelength 94.98 nm and its electron attains a higher energy level. The atom then emits two photons: one of wavelength 434.2 nm to reach an intermediate level and a second to return to the ground state. What was the wavelength of the second photon emitted?

Term used to describe this sample of granite : A sample of granite contains various oxides of silicon, aluminum, sodium, potassium, calcium, and iron. Each of these oxides gives the granite a coarse-grained texture. Which term or terms could be used to describe this sample of granite? |

Find the velocity and acceleration of the flowerpot : A flowerpot is accidently knocked off the edge of a balcony 50 m above the ground. Find the velocity and acceleration of the flowerpot at t=2.0s |

What is the maximum possible coefficient of performance : Air conditioners are rated by their coefficient of performance at 60F inside temperature and 96F outside temperature. What is the maximum possible coefficient of performance |

Explain the addition of the substances : Calculate the of 0.280L of a 0.450M NaHSO3 - 0.285M Na2SO3 buffer before and after the addition of the following substances. |

Explain what was the wavelength of the second photon emitted : One of wavelength 434.2 nm to reach an intermediate level and a second to return to the ground state. What was the wavelength of the second photon emitted |

What is the amplitude of the pressure wave : Here in Boulder, normal atmospheric pressure is NOT 1 atm (that's down at sea level) Let's call it 0.850 atm on a given day. what is the amplitude of the pressure wave |

Explain the correct statement from the multiple choices : The normal sublimation point of solid acetylene is -84 C. Figure out the answers to the questions below and then pick the correct statement from the multiple choices(i) Is the sublimation of solid acetylene an endothermic or an exothermic process |

What was the cars original kinetic energy : A 1,200 kg car going 25 m/s is brought to stop using its brakes. Let's assume that a total of approximately 20 kg of iron in the brakes, What was the car's original kinetic energy |

Explain hooke''s law why the h-x stretches absorb : Explain using Hooke's law why the H-X stretches absorb higher frequency energy than C-X stretches. (X=C,N,O) |

## What is final temperature of the water and pieces of metalA 25.35g piece of iron and a 27.40g piece of gold at 100C were dropped into 920ml of water at 19.45C. The molar heat capacities of iron and gold are 25.19 J/(mol C) and 25.41 J/(mol C). What is the final temperature of the water and pieces of meta.. |

## Define dry-cleaning solventdry-cleaning solvent (molecular weight = 146.99 g/mol) that contains C, H, and Cl is suspected to be a cancer-causing agent. When a 0.133 g sample was studied by combustion analysis, 0.239 g of CO2 and 0.0323 g of H2O formed. How many moles of eac.. |

## Explain what is the ph of the magnesium ionsThe concentration of Mg2+ in seawater is 0.052 M. What is the pH when 95% of the magnesium ions will be precipitated as the hydroxide salt. (Ksp, Mg(OH)2 is 8.9 x 10-12). |

## What is the new temperature in ocA 496-mL sample of a gas at 263 oC is cooled at constant pressure until its volume becomes 241 mL. What is the new temperature in oC? |

## Explain what is the volume of a unit cell of the metalAs a solid, Fe adopts a body-centered cubic unit cell. How many unit cells are present per cubic centimeter of Fe. What is the volume of a unit cell of this metal |

## Compartment contains a saturated solution of silver iodideConsider the following electrochemical cell at 298 K. One compartment contains a 1.00-M solution of silver nitrate. The other compartment contains a saturated solution of silver iodide |

## Compute the ph of the buffer kaCalculate the pH of this buffer if it is .10 M HC2H3O2 and .10 M C2H3O2-. The Ka for CH3COOH is 1.8x10^-5. |

## Calculating mass of the productFor each reaction, calculate the mass (in grams) of the product formed when 10.1g of the underlined reactant completely reacts. Assume that there is more than enough of the other reactant. |

## How to find the volume of the second feed solutionYou want to produce a mixture containing 19 wt% NaCl. Find the volume of the second feed solution. |

## Calculate the ph of a solutionCalculate the pH of a solution prepared by dissolving 0.30 g of BaO in enough water to make 0.800 L of solution. |

## Define what is the rate of changeThe reaction 2NO ? N2 + O2, has a rate constant of 3.6 x 10^-2 M^-1 s^-1. When [NO]= 2.8 x 10^-3 M, what is the rate of change in M.s^-1 for N2 |

## Explain equilibrium with a liquid phase also composedA vapor composed of 0.75 mole fraction ethanol and 0.25 mole fraction acetic acid at 120.0 mm Hg (absolute), is in equilibrium with a liquid phase also composed of ethanol and acetic acid. |

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