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The Aloha Chemical Sunset—Chemical Demonstration Kit

By: David A. Katz, Retired, Wilmington, DE

Item #: AP8988

Price: $25.75

In Stock.

The Aloha Chemical Sunset Chemical Demonstration Kit shows how light passing through a colloidal suspension is affected by the size of the colloidal particles. Two solutions are mixed, producing a spectacular multicolored “sunset.”

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This item can only be shipped to schools, museums and science centers

Product Details

Do you and your students need a spring break already? If you can’t see a Hawaiian sunset in person, simulate it in the classroom! This fun demonstration shows how light passing through a colloidal suspension is affected by the size of the colloidal particles—this is known as the Tyndall effect. Two solutions are mixed in a Petri dish on an overhead projector, producing a spectacular multicolored “sunset.”

Concepts: Colloids and precipitates, Tyndall effect/light scattering.
Time Required: 10–15 minutes


Materials Included in Kit: 
Hydrochloric acid solution, 1 M, 60 mL
Sodium thiosulfate solution, 0.2 M, 100 mL
Dish, culture (petri), 100 x 15 mm

Correlation to Next Generation Science Standards (NGSS)

Science & Engineering Practices

Developing and using models
Obtaining, evaluation, and communicating information

Disciplinary Core Ideas

MS-PS1.B: Chemical Reactions
MS-PS1.A: Structure and Properties of Matter
MS-PS4.A: Wave Properties
HS-PS1.A: Structure and Properties of Matter
HS-PS4.A: Wave Properties

Crosscutting Concepts

Cause and effect
Structure and function

Performance Expectations

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.
MS-PS1-5: Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.
MS-PS1-3: Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.
MS-PS4-2: Develop and use a model to describe that waves are reflected, absorbed, or transmitted through various materials.
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-PS4-1: Use mathematical representations to support a claim regarding relationships among the frequency, wavelength, and speed of waves traveling in various media.