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Wind (DVD)
Wind (DVD)
D098

This program explores the mechanics of measuring wind speed and direction as well as the use of wind as an energy source. Students will also learn how wind occurs by finding out about the roles of temperature, air pressure and the sun. Graphics and animation will clearly illustrate these patterns. Students will also learn how hot-air balloons work in this exciting look at weather's invisible force. One of six volumes in the Weather Fundamentals DVD Series in the Schlessinger Science Library. Part of the Schlessinger Science Library in Action Collection. This title correlates to the National Science Education Standards for Earth and Space Science -- structure of Earth's system, Earth's history and Earth in the solar system. A Teacher's Guide is included and available online that features additional information on the topic, vocabulary words, discussion questions, follow-up activities and lists of recommended books & Internet resources. 23 minutes. Grades 4 to 7.

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$26.95 Each $29.95 Each
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Yellow Glow-In-The-Dark Tape 2" x 10 Yards
Yellow Glow-In-The-Dark Tape 2" x 10 Yards
SF596P

The perfect way to alert the public to hazards that are located in unlit or dimly lit areas. This highly visible tape comes with a liner.

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$32.95 Each $34.95 Each
Zinc metal, foil 0.010" x 12" x 36", (1 piece = 500g) - 500g
Zinc metal, foil 0.010" x 12" x 36", (1 piece = 500g) - 500g
13445

Zinc metal, foil 0.010" x 12" x 36", (1 piece = 500g) - 500g
Zinc metal, foil 0.010" x 12" x 36", (1 piece = 500g) - 500g

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$36.50 Each
Zinc sulfate, lab grade, granular - 500g
Zinc sulfate, lab grade, granular - 500g
46878

Zinc sulfate, lab grade, granular is commonly used in classroom settings for chemistry experiments and to illustrate various scientific concepts due to its solubility and reactivity. Some of the typical applications include:

  1. Precipitation Reactions: Zinc sulfate is used to demonstrate precipitation reactions when mixed with other compounds. For example, when combined with sodium carbonate, it forms zinc carbonate, a white precipitate. This can be used to illustrate the principles of solubility, ionic reactions, and compound formation.

  2. Galvanic Cells and Electrochemistry: Zinc sulfate is frequently used in electrochemical cells (such as Daniell cells) to study the behavior of zinc as an electrode and to teach concepts of oxidation and reduction, electrode potentials, and electron flow in galvanic cells.

  3. Testing for Anions: It can be used as a reagent in testing for the presence of specific anions in solutions. For instance, in analytical chemistry, zinc sulfate might be utilized in qualitative tests to help identify sulfide ions through the formation of a white precipitate (zinc sulfide).

  4. Growth Medium for Biological Studies: In biology and environmental science classes, zinc sulfate is sometimes used as a trace element in preparing growth media for certain plants or algae to study the effects of zinc on growth and development.

  5. Illustrating Properties of Transition Metals: Zinc is often grouped with other transition metals to compare chemical properties, such as reactivity with acids and the formation of complex ions in solution.

Safety precautions should be observed when handling zinc sulfate, as it can be harmful if ingested or inhaled in powder form. Proper protective equipment, such as gloves and safety goggles, is recommended during use.

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$36.50 Each