The atom questions | form five Chemistry

1. How does a mass spectograph of a pure element is used to detect the presence of isotopes?
2. The following data were obtained for a certain pure element

Calculate the relative atomic mass of an element.

Answer / Solution

UNSOLVED

1. Use wave and particle models for energy of a particle to derive the de Broglie equation.
2. Calculate the wave length of an -particle having mass of moving with a speed of . Show your work clearly including manipulations of units.

Answer / Solution

UNSOLVED

Study carefully the Bohr`s atomic model of hydrogen atom shown below then answer the questions that follow.

1. State three postulates which led Bohr`s atomic model. Include mathematical expressions, if any , which qualify the postulate.
2. In a single sketch of Bohr`s atom, show how Lyman and Paschen spectral series are formed.

Answer / Solution

UNSOLVED

The energy difference between ground and excited state atoms of a certain element was found to be J. Calculate the wavelength and wavenumbe of the photons that excited the atoms. Show your work clearly including manipulations of units.

Answer / Solution

UNSOLVED

Dalton`s atomic theory consists of four main postulates. For each of the two postulates given below, briefly describe an experiment or discovery which is against the postulate.

1. Atoms can neither be created nor destroyed
2. All atoms of the same element are alike.

Answer / Solution

UNSOLVED