Chemlab week 1

These visible wavelengths match the differences between quantized energy levels of the detection molecules in the retina of the human eye. This absorption coloration mechanism is responsible for the colors of grass, blood and carrots, but not of the sky.

There are two ways for a material to produce the perception of a particular color. A substance that appears blue is transmitting or reflecting blue light to the eye and absorbing Chemlab week 1 colors of the white light that are not blue. For this case, the absorption spectrum of a blue solution would have a maximum absorbance at a wavelength corresponding to orange light.

The particular wavelengths of light that a given substance absorbs determine the color we perceive and depend on the energy levels of the molecules or atoms that make up the substance.

The perceived color of an object has a complementary relationship with the color of the visible light absorbed.

Visible light is the very small portion of the electromagnetic spectrum Chemlab week 1 human eyes are sensitive to. Molecules and atoms absorb light only when the energy of an impinging photon matches the energy difference between the state in which the molecule initially finds itself and some excited state of the molecule.

In equation form we can write. The object absorbs certain wavelengths of white light, and we see what is left over. In the example of a blue substance, there would be a strong absorbance of the complementary color of light, orange.

Light can be described as oscillating electric and magnetic fields, as can radio waves, microwaves, infrared radiation, ultraviolet light, and x-rays. ChemLab Home Color and Light The color of most objects depends upon the interaction between visible light and the electrons of atoms or molecules that make up the object.

One is to absorb all wavelengths of visible light, aside from the perceived color. Visible light differs from these other types of light because it has a range of wavelengths that our eyes can detect. Your textbook has a color version of this color wheel that can help you understand this complementary relationship.

The absorption spectrum would show high absorbance of all visible wavelengths, besides blue. To change from a lower quatized energy level to a higher one, the energy of the photon must match the energy gap between the levels.

A color wheel, shown below, illustrates the approximate complementary relationship between the wavelengths of light absorbed and the wavelengths transmitted or reflected.

For our blue example, the material would absorb red, orange, yellow, and violet light. First consider white light, a mixture of all visible wavelengths, impinging on a colored object.

Since color results from the absorption of visible light, it is important to examine what happens to a molecule when it absorbs a photon, or quantum of light.

The transmission or reflectance spectrum would have a maximum at a wavelength corresponding to blue light. Color wheel with approximate wavelength values for different color light.

It is usually the result of a dynamic process on the molecular level: The second way to create the perception of blue is for a material to have a strong absorbance of the opposite or complementary color of light.Adam Workman Lab, Week 1 Balance Lab Introduction The purpose of the Balance Lab experiment was to become familiar with the ChemLab software and to become/5(1).

View Lab Report - chem lab 1 from CHEM at Broward College. 1 Jeffin Jacob Lab, Week #1 BALANCE LAB Introduction The purpose of this lab experiment was to %(17).

The introduction to Week 1, in this manual, describes the form and constants that appear in Beer's Law in detail.

Recall that the equation of Beer's Law is A = c L. Chemlab Week 1 Essay Name: Marquetta Turner Lab, Week # 1 BALANCE LAB Introduction: Using the direct weighing and weighing by difference methods to find weight and mass of chemicals.

The purpose of this lab was to be familiar with the different balances. CHEMISTRY CHEM School: University of Phoenix * Professor: {[ professorsList ]} Week 1 excercises University of Phoenix CHEM CHEMISTRY - Summer Register Now; Week 1 excercises.

1 pages. Week 3 Text Exercises- Part II University of Phoenix. Jan 24,  · ChemLab - 9. Kinetic Study of the Reaction between Ferric and Iodide Ions - Duration: METU - Quantum Mechanics II - Week 1 - Lecture 1 - Duration: .

Chemlab week 1
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