The Flame Tests/Emission Spectroscopy Chemical Demonstration Kit is an easy to perform, unique flame test that incorporates diffraction grating. Using the Flinn C-Spectra®
allows students to view vivid colors for several minutes.
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Each element emits a specific wavelength of light, thus a characteristic color, when excited by a flame. This unique flame test kit produces better results and is easier to perform than the expensive platinum wire procedure. A laboratory burner is placed on top of a Petri dish, which has a hole cut in its top. Inside the Petri dish a chemical reaction takes place, producing a gas. The gas rises, carrying some metallic ions into the burner flame. The burner flame becomes the characteristic color of the excited element. The vivid colors last several minutes, allowing students plenty of time to view the colored flame through Flinn C-Spectra®. A specially designed can is placed over the laboratory burner to help direct the metallic ions and gas into the flame. Teacher Demonstration Notes and reproducible student worksheet included.
Concepts: Absorption, emission, diffraction grating, flame tests, emission spectra.
Time Required: 15 minutes
Materials Provided: Specially cut can, Petri dish bottoms, specially cut Petri dish top, 12 1"-square Flinn C-Spectra® pieces, hydrochloric acid solution, mossy zinc, lithium chloride, sodium chloride, strontium chloride, barium chloride, potassium chloride, calcium chloride.
Correlation to Next Generation Science Standards (NGSS)
Science & Engineering Practices
Developing and using models
Planning and carrying out investigations
Analyzing and interpreting data
Constructing explanations and designing solutions
Engaging in argument from evidence
Disciplinary Core Ideas
MS-PS1.A: Structure and Properties of Matter
MS-PS1.B: Chemical Reactions
HS-PS1.A: Structure and Properties of Matter
HS-PS1.B: Chemical Reactions
HS-PS4.B: Electromagnetic Radiation
Scale, proportion, and quantity
Systems and system models
Structure and function
MS-PS1-1. Develop models to describe the atomic composition of simple molecules and extended structures.
MS-PS1-3. Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.
MS-PS1-2. Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred.
HS-PS1-1. Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.
HS-PS1-2. Construct and revise an explanation for the outcome of a simple chemical reaction based on the outermost electron states of atoms, trends in the periodic table, and knowledge of the patterns of chemical properties.
HS-PS1-3. Plan and conduct an investigation to gather evidence to compare the structure of substances at the bulk scale to infer the strength of electrical forces between particles.