Download CSET Chemistry 121, 125 Teacher Certification Test Prep by Sharon Wynne PDF

By Sharon Wynne

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Extra resources for CSET Chemistry 121, 125 Teacher Certification Test Prep Study Guide, 2nd Edition (XAM CSET)

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The frequencies of emitted photons are then determined as the electrons release energy. CHEMISTRY 14 TEACHER CERTIFICATION EXAM An emission spectrum in the visible region typically consists of lines of light at certain colors corresponding to distinct wavelengths of emission. The bands of emitted or absorbed light at these wavelengths are called spectral lines. Each element has a unique line spectrum. Light from a star (including the sun) may be analyzed to determine what elements are present. A simple optical spectroscope separates visible light into distinct wavelengths by passing the light through a prism or diffraction grating.

These two processes always occur together in oxidation-reduction reactions, also called redox reactions. Electrons lost by one substance are gained by the other. The easiest redox processes to identify are those involving monatomic ions with altered charges.

This is represented by a complete ionic equation that shows all the dissolved ions: CHEMISTRY 37 TEACHER CERTIFICATION EXAM H+ (aq ) + Cl– (aq ) + Na+ (aq ) + OH– (aq ) → H2O(l ) + Na+ (aq ) + Cl– (aq ) . Because Na+(aq) and Cl–(aq) appear as both reactants and products, they play no role in the reaction. Ions that appear in identical chemical forms on both sides of an ionic equation are called spectator ions because they aren't part of the action. 1d) is that the equation contains an equal charge on each side.

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