This program looks at the wide range of climates in North America and around the world, and examines how factors such as the sun, wind, temperature, precipitation and position of Earth determine the weather for a particular region. Live footage, vivid graphics and a hands-on experiment help to clearly illustrate these concepts. 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 and Internet resources. 23 minutes. Grades 4 to 7.
Cobalt chloride crystals are commonly used in classrooms for chemistry experiments and demonstrations, primarily to study chemical properties and investigate reactions involving moisture and hydration. The most notable uses include:
-
Indicator for Humidity and Hydration: Cobalt chloride is a popular indicator for moisture because it changes color based on its hydration state. In its anhydrous form, cobalt chloride is blue, and it turns pink when it absorbs water. This property makes it ideal for demonstrating reversible chemical changes and teaching about hydration and dehydration reactions.
-
Le Chatelier’s Principle Demonstrations: Cobalt chloride can be used to illustrate Le Chatelier's Principle. By adding water or applying heat to the crystal, students can observe the reversible color change, demonstrating shifts in equilibrium due to changes in temperature or the presence of a reactant.
-
Testing for Water Presence: Cobalt chloride paper, which is made using the crystals, is used in chemistry and environmental science labs to detect water vapor in various gases or liquids.
Due to its potential toxicity and the fact that it can cause skin irritation, cobalt chloride should be handled with proper safety measures, including wearing gloves and protective eyewear.
• Power Dome and handle interfuse creating strength
• Thicker wall resists denting
• Tire Locking Ring Design inhibits movement of drum on road surface
• Wedge fit created from skirt ramp and elliptical shaped bottom
• Textured skirt increases friction and grabs tire
• Anti-roll design, flat sections on two sides
• Revolutionary folding light mounting design for easy stacking
• NEW Tighter stacking & packing for 20% more per truckload
• Maximizes transport and storage space
• NCHRP-350 Accepted, meets MUTCD standards
• Dimensions: 39.7”H x 23.5”W
• Weight: 8 lbs
• MINIMUM ORDER OF 5 BARRELS
• Ships Freight (Shipping = $50 for the first unit + $25 each additional unit)
• Weighted base sold separately (order SS016D)
Power Dome and handle interfuse creating strength. Thicker wall resists denting . Tire Locking Ring Design inhibits movement of drum on road surface. Wedge fit created from skirt ramp and elliptical shaped bottom. Textured skirt increases friction and grabs tire. Anti-roll design, flat sections on two sides. Revolutionary folding light mounting design for easy stacking. NEW Tighter stacking & packing for 20% more per truckload. Maximizes transport and storage space. NCHRP-350 Accepted, meets MUTCD standards. Dimensions: 39.7”H x 23.5”W. Weight: 8 lbs. Ships Freight. Weighted base sold separately (order SS016D).
Comparative Anatomy: Dissection uses systematics and anatomy to illustrate the similarities and differences of systems in different organisms. Students learn how advances in medicine have come from the careful study of organs and have an opportunity to discuss the ethical codes of scientists. Through a lab investigation, students become comfortable with the scientific tools and habits of mind used in the fields of gross anatomy and histology. Part of the multivolume Science Lab Investigations! DVD Series. Includes a Teacher's Guide.
- x3 magnets on the bottom for metal mounting
- x2 reflective strips on the top face
- x4 light diffusers on the top face
- 360 degree visibility
- Waterproof IPX5
- On/Off and Function Buttons
Introducing our NEW Stop-Lite LED Cone Ring Light, designed to fit all standard traffic cones with ease. This durable and multi-functional ring light features a built-in rechargeable lithium ion battery that provides long-lasting illumination for any outdoor application.
It has six different lighting functions to choose from, offering flexibility and visibility to ensure maximum safety on the road. Whether you need to direct traffic, alert drivers of hazards, or improve visibility in low-light conditions, our Cone Ring Light is the ideal solution for any traffic safety situation.
Made of polypropylene and can hold 10 standard 1" x 3" microscope slides back to back. The interior is grooved in a way to hold the slides in an erect position. Jar features domed and shallow thread screw cap.
Cupric sulfate (copper(II) sulfate) reagent fine crystals are widely used in classrooms for chemistry experiments and demonstrations, primarily due to their distinct blue color and diverse chemical properties. Common educational uses include:
-
Chemical Reactions and Color Changes: Cupric sulfate is often used in experiments to demonstrate various chemical reactions, such as double displacement reactions and redox reactions. For example, when zinc metal is placed in a solution of cupric sulfate, a redox reaction occurs, producing copper metal and zinc sulfate.
-
Electrolysis and Electroplating: Cupric sulfate is commonly used in electrochemistry experiments to demonstrate the principles of electrolysis. Students can use it to deposit a layer of copper on a metal object, illustrating the concept of metal plating.
-
Crystallization and Hydration Studies: Cupric sulfate crystals are ideal for studying crystallization and hydration. In its hydrated form (CuSO₄•5H₂O), it is a vibrant blue, but it turns white upon heating when it loses its water molecules. This change is used to teach about the effects of hydration and dehydration on compounds.
-
Identifying Presence of Water: Cupric sulfate can also be used as a qualitative test for water. The blue hydrated form turns white when heated (as it becomes anhydrous), and when a drop of water is added to the anhydrous form, it turns blue again. This makes it an excellent tool for illustrating reversible hydration reactions.
-
Demonstrating Copper Ion Properties: The distinct blue color of cupric sulfate is due to the presence of copper(II) ions in solution. It is often used to teach students about the behavior of transition metals and their unique colors in aqueous solutions.
Cupric sulfate should be handled carefully, as it is toxic if ingested and can cause irritation to skin and eyes. Proper safety equipment, including gloves and goggles, should be used during experiments.
Use alone or together with Metric Set for comparison activities. Set of hexagonal, plastic-coated weights contains eight 1 oz weights, two each of 4 oz and 8 oz weights, and one 1 lb weight. Stackable, color-coded weights with beveled edges come in a plastic storage box. Set of 13. Ages 8-13.
35" x 14" High quality N-series mesh. 3M Scotchlite reflective material high intensity tape. Has 3M reflective material high intensity trim. Adjustable front flaps and a full length hook and loop closure for a secure fit.
Limited Quantities Available
Set of 6. Aluminum, Brass, Copper, Steel, Lead, Zinc. With hooks. Diameter 25mm.
Set of 6. Aluminum, Brass, Copper, Steel, Lead, Zinc. With hooks. Diameter 25mm.
Set of 6. Aluminum, Brass, Copper, Steel, Lead, Zinc. With hooks. Diameter 25mm.
Set of 6. Aluminum, Brass, Copper, Steel, Lead, Zinc. With hooks. Diameter 25mm.
A great economical model to teach dental hygine and demonstrate the correct way to brush teeth and gums. Large lower and upper jaws, 6" wide on the back, 5" long. The two jaws are connected by bendable spring wires for easy demonstration. The model is 17" long, when it is completely laid flat. Included a 10" long tooth brush with nylon bristles.
A great economical model to teach dental hygine and demonstrate the correct way to brush teeth and gums. Large lower and upper jaws, 6" wide on the back, 5" long. The two jaws are connected by bendable spring wires for easy demonstration. The model is 17" long, when it is completely laid flat. Included a 10" long tooth brush with nylon bristles.
• Dual Scale
• Hecto Pascal (hPa)
• Millimeter Mercury (mmHg)
• 4" Dial
• 5 YR Warranty
Dial Barometer for Classroom, Lab, Industrial Use. Large, clear dual-scale barometer in hPa (hecto Pascal) and mm (millimeter mercury) on a 4" dial which is easy to read from a distance. For classroom, lab, or industrial use. Accuracy of ±3 to 4 hPa. Wall mounts. Weight: 2.6 oz.
For classroom, lab, or industrial use. Large, clear 20-100% RH scale on 4" dial. Easily read from a distance. Uses a precise synthetic hair hygrometer with an accuracy of Ò5%. Plastic face meets food industry requirements. Inner dial shows temperature using a bimetal thermometer, with an accuracy of Ò2ßF. Wall mounts
For classroom, lab, or industrial use. Large, clear 20-100 percent RH scale on 4 inch dial. Easily read from a distance. Uses a precise synthetic hair hygrometer with an accuracy of ±5%. Plastic face meets food industry requirements. Inner dial shows temperature using a bimetal thermometer, with an accuracy of ±2 degrees F. Wall mounts
In Earthquakes, students discover how the underground movement of rocks, along with stresses on Earth's crust, produce surface-level tremors. Learn how scientists determine where the hypocenter and epicenter of a quake occur while exploring the destructive power of seismic waves. Investigate some of the most destructive earthquakes of the 20th century, and learn how seismologists predict where they will occur. A visit to the University of California at Berkeley showcases the use of a "shaker table" by engineers designing buildings, while a fun, hands-on investigation demonstrates how students can build a simple model of a seismograph and put it through a simulated earthquake. Part of the Earth Science in Action DVD Series. A Teacher's Guide is included and available online. 23 minutes. Grades 5 to 8.
• 400-800 Yard range
• Power from 4 to 8 watts
• Adjustable volume control
• Powerful siren
• Convenient wrist strap and compact handle for easy holding
• Takes six AA batteries (not included)
Get their attention while saving your voice with this 4 Watt Mini Megaphone. With a range of 400-800 yards, this megaphone comes with an adjustable volume control and powerful siren to communicate a variety of messages to different types of audiences. Equipped with a convenient wrist strap, this megaphone is easy to keep close at hand when you need it most.
This introductory set contains the following: Amoeba, Paramecium, Hydra plain, Sponge spicules, Planaria, Tricinella in muscle, Earthworm cross section of anterior and posterior, Clam gill, Daphnia, Fruitfly, Housefly head, insect trachea.
Wide-mouth, conical flask made of polypropylene. Comes with a screw cap, or can be used with a stopper. Chemical resistant, and autoclavable to 135º C. Graduated in easy to see green print. Sold in packs of 12.
Odd-shaped magnets make odd-shaped magnetic fields. This kit has seven very powerful neodymium rare earth magnets in seven unusual shapes. When placed near or on top of the included magnetic field viewer containing iron filings, the iron filings line up in amusing patterns. The 2.5" x 3.5" viewer is sealed so the filings won't spill or stick. Shapes included: bar, star, heart, disk, triangle, ball and ring. With 3/4" x 4" keeper and instructions.
• Amber bi-directional light
• Meets MUTCD and ITE specifications
• 3-way - flashing, steady burn, off
• Weather resistant circuit chip
• 7" Polycarbonate Lens - extremely durable. UV Stabilized
• Attach to all barricades, drums, panels, etc.
• yellow housing/base uses (2)6-volt batteries (not included)
Our light comes standard with all of the features that you would pay more for on competitive lights. Features such as a photocell which automatically turns the light off when the surrounding light conditions make the light ineffective... Sunny daylight hours are an excellent example of this. This feature greatly extends the life of the batteries as the light only operates when it can be seen. Increased battery life not only saves you money on batteries, but on the labor required to service the light as well. Another key feature is our 3-Way Switch. This switch allows a single light to serve two purposes. Each of our lights operates in either flashing or steady-burn modes. It only takes a simple turn of the switch to change the personality of our lights. Another cost- saving feature is that our light will accept batteries in any orientation as long as the springs are pointing up. There is no need to wonder if the battery is positioned properly, there will be no more batteries thrown out because it was thought that they were bad, when the real problem was the battery turned in the wrong direction. Compare our light to the competition and you will see that we out-shine them every time. Battery not included.
• Hand-held battery powered warning light wand.
• Essential equipment for crowd and traffic control.
• 120 flashes per minute.
• Can be seen up to 1/2 mile away.
• 300 hours of continuous flashing operation
• Easy grip ABS handle.
• Emits a bright red flash with 10 LED bulbs.
• Rugged polycarbonate refractor lens
• Weighs only one pound with batteries
• Length: 19-1/2" x 1-3/4" diameter.
• Wrist strap and clip for belt attachment.
The Baton is a hand-held, battery powered warning light wand. Designed as a durable, quality built, essential equipment for crowd and traffic control. The Baton quickly attracts attention and has found wide acceptance by police, emergency medical crews and fire departments. The Baton is so portable and light in weight that a child can handle it easily. It can be operated in the steady state or, with a flip of the switch, produce up to 120 flashes per minute. More than a foot of bright flashing light that can be seen up to 1/2 mile away. Provides a reliable minimum of 300 hours of continuous flashing operation (with new batteries). Powered by two (2) D-cell batteries (not included). Easy grip handle. Emits a bright red flash with 10 LED bulbs. Rugged polycarbonate refractor lens and ABS handle. Weighs only one pound with batteries. Over all length: 19-1/2" x 1-3/4" diameter. Handy long life wrist strap and convenient designed-in clip for belt attachment.
For thousands of years, humans dreamed of flying -- but it isn't as easy as birds make it look. Students will learn about lift, gravity, thrust and drag -- the forces that are used to get tons of steel off the ground and carry people thousands of miles before landing safely. They will also discover the role atoms and air pressure play in this amazing task as well as in other forms of flight. An interesting hands-on activity is included along with fun, real-life demonstrations to further illustrate these concepts. One of 16 volumes in the Physical Science in Action 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 Physical Science -- properties and changes in properties of matter, motions and forces and transfer of energy. A Teacher's Guide is included and available online. 23 minutes. Grades 5 to 8.
• Injection molded traffic cones don’t stick together
• Patented interlocking design secures fluorescent portion of hazard cone to recycled black base
• Brilliant fluorescent lime cones with UV inhibitors to resist fading
• Superior flexibility in heat and cold
• Bounce back from an impact
• Recycled black base traffic cones look clean despite heavy use
• Available in 3 sizes
18" high with 11" square base
28" high with 14" square base
36" high with 14" square base
These Injection molded traffic cones won't stick together! Patented interlocking design secures fluorescent portion of hazard cone to recycled black base. Brilliant fluorescent lime cones with UV inhibitors to resist fading. Superior flexibility in heat and cold - PVC is better than rubber traffic cones and pylons, since it can instantly bounce back from an impact. The recycled black base keeps your cone looking clean despite heavy use, being run over, and tar stains!