5 minute read
STEM Investigations
The voltaic cell is an electrochemical cell that produces electrical energy through a chemical reaction, specifically an oxidation-reduction reaction. In this activity, students will set up electrochemical cells, with each group using a different combination of materials for the anode and the cathode of the cell. Students will also compare two different styles of cell, one using a salt bridge and one using a semi-permeable membrane. After determining the voltage output of their cells and comparing their values to the rest of the class, students will be challenged to design an electrochemical cell that can run a small motor. Kit contains enough materials for 15 groups. Teacher’s manual and student study guide copymasters are included.
Kit Includes: 1L Copper Chloride 1.0M 1L Iron Chloride 1.0M 1L Zinc Chloride 1.0M 1L Potassium Chloride 1.0M 125 pieces Tin Foil Strips 125 pieces Aluminum Metal Strips 125 pieces Magnesium Metal Ribbon Strips 15ft Dialysis Tubing 15 Black Connecting Wires with Alligator Clips 60 Pipettes 1L Magnesium Chloride 1.0M 1L Tin (II) Chloride 1.0M 1L Aluminum Chloride 1.0M 125 pieces Copper Metal Foil Strips 125 pieces Iron Metal Strips 125 pieces Zinc Strips 60 Cups, 5oz 15 Red Connecting Wires with Alligator Clips 20 pieces Filter Paper 15 3 volt Motors
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DOT Info: UN3082, RQ, Environmentally hazardous substance, liquid, n.o.s., (Cupric chloride solution), 9, III, Ltd Qty UN1760, Corrosive liquids, n.o.s., (Stannous chloride, Hydrochloric acid), 8, III, Ltd Qty NA1760, Ferrous chloride solution, 8, III, Ltd Qty UN2581, Aluminum chloride solution, 8, III, Ltd Qty WARNING: This product can expose you to chemicals including Phthalates, which is known to the State of California to cause reproductive harm. For more information go to http://www. P65Warnings.ca.gov.
IS3450 $399.00
STEM Investigations: Fingerprint Classification
In this lab activity students will learn about the history of fingerprinting as a tool for identification. They then will analyze fingerprints for common characteristics and create a classification system using those characteristics. Once they have created a system, they will analyze class data using the system that is used worldwide for classification. This kit includes an optional activity where students can practice lifting a fingerprint and comparing it to a “crime scene” print. Kit contains enough materials for 15 groups. Teacher’s Guide and Student Study Guide copymasters are included.
Kit includes: 15 Hand magnifiers 1 Ink pad 1 btl Fingerprinting powder 15 Fingerprinting brushes 30 Acetate sheets Fingerprint Record Sheet
DOT Info: Non-regulated
WARNING: This product can expose you to chemicals including Carbon Black, which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
IS3451 $74.10
How do scientists know if something is alive? There are certain characteristics that the scientific community uses to determine whether something could be considered living. On first observation, yeast does not look like a typical living thing. In this activity, students will hypothesize about yeast and then test to see if their hypothesis is correct. Using this information they will be able to come to a conclusion to the question of whether yeast is alive. Kit contains enough materials for 15 groups. Teacher’s Guide and Student Study Guide copymasters are included.
Kit Includes: 30 Test tubes 40g Yeast 25g Sugar 40 Water Balloons 20 Petri dishes 2btl Sabouraud-Dextrose Agar 15 Pipette
CHOKING HAZARD
Children under 8 years can choke or suffocate on uninflated or broken balloons. Adult supervision required. Keep uninflated balloons from children. Discard broken balloons at once.
DOT Info: Non-regulated
IS3452 $74.15
STEM Investigations: Design a Water Filter
How is the water that comes out of our faucets made safe for consumption? Students will learn about the processes performed at water treatment facilities, and then engineer their own small scale filtration plant. Once they design their filtering system, they will observe and evaluate the quality of the water they produce. Kit contains enough materials for 15 groups of students. Teacher’s Manual and Student Study Guide copymasters are included.
Kit Includes: 1500g Fine Sand 1500g Gravel 300g Activated Charcoal 15 Coffee Filters 1 bag Cotton Balls 5mL Green Food Coloring 25mL White Vinegar 75 Plastic Cups 15 Stirring Sticks
DOT Info: Non-regulated
WARNING: This product can expose you to chemicals including Respirable crystalline silica which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov.
IS3453 $61.75
Students explore materials science and engineering while learning about an interesting state of matter: liquid crystals. Liquid crystals have an ordered structure like a solid, but are also fluid like a liquid. The molecular-level structure of a liquid crystal can be affected by changes in its environment, such as electric field or temperature, which can lead to changes in its macroscopic properties, such as color. In this experiment, students mix three chemicals in different ratios to form four different liquid crystal mixtures that are sensitive to temperature. Working in groups, students will determine the working temperature range for each of the four liquid crystal mixtures. As an engineering challenge, the students will then use the information they have gathered to design and construct a thermometer using their liquid crystals. Through this kit, students will gain an understanding of liquid crystals and how they can be used in a variety of everyday technologies.
Kit Includes: 5g Cholesteryl Oleyl Carbonate 5g Cholesteryl Pelargonate 2g Cholesteryl Benzoate 8 Dram Vials with Caps 90 Clear Labels 8 Plastic Forceps 16 Black Index Card, 4”x 6”
DOT Info: Non-regulated
IS3454 $184.30
Hundreds of millions of tons of plastic are produced each year and used for a variety of products, from packaging to automobiles. The majority of these products are disposable items, leading to excessive amounts of plastic being discarded into landfills and the oceans. Due to the major threat this poses to the environment, scientists and engineers are developing bioplastics that break down more quickly and produce less harmful byproducts than traditional plastics. In this activity, students will make samples of different bioplastics to study how their composition affects their physical properties. They will then use what they have learned to create a bioplastic that could be used to replace the PET plastic in disposable water bottles. Additionally, students will design an experiment to compare the biodegradability of their bioplastic samples to a traditional plastic. Kit contains enough materials for 15 groups. Teacher’s Manual and Student Study Guide copy masters are included.
Kit Includes: 25mL Glycerin 75mL Vinegar 175g Gelatin 125g Starch 45 Petri dishes 30 Pipettes
DOT Info: Non-regulated
IS3455
