Belleville: Micro STEM 6/19-23
Students began a two day project today, investigating bacteria that surrounds us. Each student will test their own fingers, and each group of 4 students could pick up to 8 different surfaces to see what kinds of bacteria live there. Alternatively, the students could choose to see what happened to the bacteria from the same surface with some sort of treatment (applying hand sanitizer, soap, etc.). Students were given the chance to make a hypothesis about what they expect to see on their plates. Later on this week, the students will use a microscope to look at the results of their samples, and test their hypotheses.
Ask your student: If bacteria surrounds us, why don’t we get sick more often? (Not all bacteria are pathogenic (disease causing)) What are some examples of places where good bacteria are found? (Almost anywhere has some amount of good bacteria, some examples would be in our intestines and mouth)
Students continued their exploration in thermodynamics today with another heating experiment. Yesterday, students started with a beaker of ice, which they heated until the water boiled. They created a time versus temperature graph of their collected data in order to observe how phase changes affect temperature. Today, students performed the same experiment with a twist: they added salt to the water. They created another graph, and compared how the salt affected the time vs. temperature curve.
Ask your student: How did adding salt change the way your graph looked? (boiling point increased, reduced the time it took to melt) What do the plateaus on the graph represent? (phase changes)
Today, in MicroSTEM, the students built upon their knowledge of atoms and ions as they used their own bodies to represent atoms and ions that bond to form ionic compounds. The students played a game where they were challenged to find a partner “match” to create an ionic compound with a net charge of zero. Also, today in MicroSTEM, the students built simple ionic compounds and then created crystalline structures with the whole class.
Ask your student: To create a neutral ionic compound with a Sodium ion (+1 charge), what charge would the other ion have to be? (-1 charge)
Today, the investigation of different kinds of magnifying devices continued. Students got the chance to go outside and collect various samples of their choice. After collection, the samples were brought inside to be analyzed with a compound light microscope. Students also reviewed the various parts of a compound microscope, and the importance of each part in the function of the microscope as a whole.
Ask your student: What similarities and differences did you notice when you were using the different tools for magnification (MicroPhone lens, hand lens, compound light microscope, and stereoscope)?
Today, in MircoSTEM, the students examined real circuits in a calculator to see how a calculator functions and explore how numbers are displayed. Students focused on the display of the calculator, in particular how numbers are displayed using a 7-segment display.
Ask your student: What type of numerical display do most four function calculators have? (7-segment) What type of numerical display do most graphing calculators have? (Dot matrix)