# Licl color and wavelength relationship

### Light and Colour

Bright line spectra as emitted by an excited gas or solid c. The relationship between color, wavelength, fre‑ quency and energy. BACKGROUND AND THEORY. Colors of Flame Position Wavelength nm Sodium Chloride Orange 60 Copper Copper II Chloride Yellow-Green Lithium Chloride Red of the photon, and atomic energy levels have interacting relationships. combination of wavelengths of light as the "complimentary" color (Table 1, Mathematically, this relationship is expressed by (3) A = ε C l.

Students know the structure of the atom and know it is composed of protons, neutrons and electrons.

## Light and Colour

Scientific progress is made by asking meaningful questions and conducting careful investigations. As a basis for understanding this concept and addressing the content in the other three strands, students should develop their own questions and perform investigations.

Construct appropriate graphs from data and develop quantitative statements about the relationship between variables.

Apply simple mathematical relationships to determine a missing quantity in a mathematical expression, given the two remaining terms. Distinguish between linear and nonlinear relationships on a graph of data.

### Flame Tests of Metal Cations

Depicts the atom as a small, positively charged nucleus surrounded by negatively charged electrons that travel in circular orbits n around the nucleus. When determining the atomic structure of an element, electrons must first fill the lowest energy-state orbitals until they become full and only then can electrons begin to fill higher energy orbitals. In addition, orbitals hold a specific number of electrons. Energy absorbed by the atom will be equal to the energy emitted by the atom, even if energy has changed forms.

The electromagnetic spectrum includes all possible frequencies of electromagnetic radiation, with wavelengths ranging from kilometers radio waves to 1 x m gamma radiation. Number of times a wavelength repeats itself per unit time. Range of wavelengths within the electromagnetic spectrum that is visible by to the human eye nm Instructional Design: This activity includes three lab sections, including pre-lab, data collection and analysis and applied topics.

In the Pre-Lab students will review vocabulary and complete written response questions covering the basic components of waves, including wavelength and frequency, and will practice identifying these components from a sample spectra.

Line spectrum for neon. Because each element has an exactly defined line emission spectrum, scientists are able to identify them by the color of flame they produce. For example, copper produces a blue flame, lithium and strontium a red flame, calcium an orange flame, sodium a yellow flame, and barium a green flame.

This picture illustrates the distinctive colors produced by burning particular elements.

### Flame Test Lab and the Electromagnetic Spectrum

A flame from an oxyacetylene torch burns at over ? C, hot enough to use for underwater welding. Flame Color tells us about the temperature of a candle flame. That is the hottest part of the flame. The color inside the flame becomes yellow, orange, and finally red. The further you reach from the center of the flame, the lower the temperature will be.

## Flame Test Lab and the Electromagnetic Spectrum

The orange, yellow, and red colors in a flame do not relate only to color temperature. Gas excitations also play a major role in flame color. One of the major constituents in a burning flame is soot, which has a complex and diverse composition of carbon compounds. The variety of these compounds creates a practically continuous range of possible quantum states to which electrons can be excited.