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Properties of Liquids and Solids
105
Properties of Liquids and Solids— Laboratory Kits, continued
It’s Just a Phase—Heating and Cooling Curves—Student Laboratory Kit
By: The Flinn Staff
It seems counterintuitive—when freezing weather is predicted, orange growers spray the trees with water to prevent the fruit from freezing! The water actually releases heat when it solidifies. The purpose of this experiment is to investigate the solid–liquid phase changes for an unknown organic solid and determine the energy changes that take place when a solid melts or a liquid freezes. Students measure the heating and cooling curves for the solid and identify the unknown based on its melting point. Kit contains three low-melting organic “unknowns” and borosilicate glass test tubes. Reproducible student handouts, detailed background information, complete Teacher Notes with sample data and answers to all questions, and all chemicals and consumable supplies needed to perform the lab are provided.
Complete for 30 students working in pairs. Fifteen digital thermom- eters are recommended and available separately.
See free video at flinnsci.com.
Intermolecular Forces—
Student Laboratory Kit
By: Mark Langella
Mahopac High School, Mahopac, NY
The forces that act between molecules play a significant role in many aspects of chemistry. The boiling point of liquids and the solubility of solids, even the structure of DNA and proteins, all depend on intermo- lecular forces. This activity consists of six short tests to investigate the effect of intermolecular forces on the properties of compounds. Students observe and compare the surface tension, capillary action, evaporation, cohesion, and solubility of different compounds. The results allow students to determine the requirements and relative strengths of dipole– dipole interactions, hydrogen bonding, and London dispersion forces. Kit includes ethyl alcohol, micro-tip pipets, glass and plastic slides, microspatulas, capillary tubes, and Petri dishes, along with reproduc- ible student handouts, detailed background information and complete Teacher Notes with sample data and answers to all questions.
Complete for 30 students working in pairs.
Properties of Solids—
Student Laboratory Kit
By: The Flinn Staff
What kinds of forces hold atoms together? How does the nature of the bonding force affect the properties of a material? Finding patterns in the properties of substances can help students understand how and why atoms join together to form compounds. In this experiment, students examine the physical properties of five common solids and investigate the relationship between the type of bonding in a substance and its properties. Includes reproducible student handouts, detailed back- ground information, and Teacher Notes with sample data and answers to questions.
Complete for 30 students working in pairs. Super Value Kit is complete for 5 classes of 30 students working in pairs. Perform this experiment in a fume hood or well-ventilated lab.
It’s Just a Phase—Heating and Cooling Curves—Student Laboratory Kit AP6886
Intermolecular Forces—Student Laboratory Kit AP6930
Properties of Solids—Student Laboratory Kit AP6634
Catalog No.
Description
Price/Each
AP6886
It’s Just a Phase—Heating and Cooling Curves— Student Laboratory Kit
$28.70
AP6049
Flinn Digital Pocket Thermometer, Economy Choice
29.30
Catalog No.
Description
Price/Each
AP6930
Intermolecular Forces—Student Laboratory Kit
$54.35
Catalog No.
Description
Price/Each
AP6634
Properties of Solids—Student Laboratory Kit
$45.15
AP6731
Properties of Solids—Super Value Laboratory Kit
87.10
PROPERTIES OF LIQUIDS AND SOLIDS—LABORATORY KITS continued on next page.