These chemistry laboratory experiments were created for Holy Cross Regional School (HCRS) in Lynchburg VA. The objective was for chemistry students to use an inexpensive, digital, laboratory scale to measure the weights of small fruits; dried beans; and packaged candies, chocolates, and chips, all of which were safe for students, inexpensive, and easily available at a supermarket.
The selected digital laboratory pocket scale that we used is now available at Amazon.com for $14.07 (as of June 12, 2016). Since I was an Amazon Prime member, I paid no shipping costs.
Because of its low cost, an entire, high-school laboratory can be equipped such scales. The maximum scale capacity is only 100 grams, with a sensitivity of 0.01 grams. Such characteristics are amazing. The small capacity of this scale encourages the use of small quantities of reagents and supplies. Parents of home school students can purchase this inexpensive scale. In fact, all parents can purchase it.
The Grobet scale facilitates the creation of electronic data files. To create one such file, it is necessary to write the values of measurements, then type the sequence of measurements into an Excel spreadsheet. Once the data set is available within the spreadsheet, it is easy to compute an average, standard deviation and histogram.
My grandson, Chase Rony, and I weighed a variety of different chocolates, chips, dried beans, and small fruits. Why no candies? Because I prefer chocolates over candies. Anyway, such a preference was to no avail, because Chase’s dog, Bullit, climbed on the unprotected table and ate most of the chocolates. You can imagine what happened around our house for the next several hours.
The foods that we weighed included the following: bagel crisps, 3-Cheerio groups, blackberries, Cheerios, cherry tomatoes, chocolate sandwich cookies, dark chocolate morsels, dried garbanzo beans, dried lima beans, dried red beans, dried white beans, Easter eggs, Gardettos crackers (various types), Goldfish® graham crackers, green seedless grapes, Hershey’s® with almonds, Kellogg’s® mini wheats, Lays® potato chips, M&M® peanuts (various colors), M&M® chocolates (various colors), petite carrots, Pringles®, Reese® peanut butter cup minis, sour-cream-and onion potato chips, split lentils, strawberries, and Triscuits®. Please observe the inclusion of several, high-nutrition foods: cherry tomatoes, green seedless grapes, blackberries, petite carrots, and strawberries.