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Radioactive Dinner Plate

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This video shows two plates being measured for emission of radiation. The orange Fiesta plate was made using a glaze which contains uranium oxide. Fiesta dinnerware was produced by the Homer Laughlin China Company of West Virginia. Prior to World War II the glazes used natural uranium.  This practice stopped during the war when the US government seized the company's stock of uranium for the Manhattan Project.  In the late 1950's the Atomic Energy Commission relaxed restrictions on uranium and production practices switched to using depleted uranium to produce the red-orange glaze. The US Environmental Protection Agency recommends that dinnerware produced with uranium glaze should not be used for food, drink or food storage.
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NGSS HS-PS2-4 :  Use mathematical representations of Newton’s Law of Gravitation and Coulomb’s Law to describe and predict the gravitational and electrostatic forces between objects. Class started by trying to identify Cause and Effect relationships in the video below. Our next activity was an in class demonstration using a balloon, cloth and small pieces of paper.  The goal of the demo was to jump start thinking about how gravity and electrostatic forces can be compared to each other. Students completed a jig-saw activity to compile notes for Newton's Law of Gravitation and Coulomb's Law. I took pictures for each class and will share in their stream on Google Classroom.
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Spectrophotometry Experiment

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An interesting challenge in science is measuring things that can't be measured directly. Direct measurements are pretty straight forward.  If you want to know the mass of a pencil, you simply use a balance to measure the pencil's mass.  Sometime there are things that we want to measure which can't be measured directly.  Luckily we can use indirect measurements.  This is when we measure one thing to determine a different measurement. This video shows an experiment using a spectrophotometer to measure the amount of light which is absorbed by a solution of iron (III) chloride.  The data can be used to create a standard curve which will be used to calculate the concentration of the solution of iron(III) chloride.  The concentration of the iron (III) chloride can't be measured directly by the spectrophotometer, but it can be determined as an indirect measurement by analyzing the absorption data. I hope this was helpful!
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