Physics > QUESTIONS & ANSWERS > M2L4A2_Half_Life_Gizmo (questions with 100% verified correct answers) (All)

M2L4A2_Half_Life_Gizmo (questions with 100% verified correct answers)

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M2L4A2_Half_Life_Gizmo (questions with 100% verified correct answers)Name: Andrea Gwin Date: 06/29/18 Student Exploration: Half-life NCVPS Chemistry Fall 2014 1. Have you ever made microwave popco... rn? If so, what do you hear while the popcorn is in the microwave? Popping 2. If you turn the microwave on for two minutes, is the rate of popping always the same, or does it change? Explain: It changes. Sometimes there is no popping and 3. at other time there is a lot of popping Gizmo Warm-up Like an un-popped kernel in the microwave, a radioactive atom can change at any time. Radioactive atoms change by emitting radiation in the form of tiny particles and/or energy. This process, called decay, causes the radioactive atom to change into a stable daughter atom. 1. What do you see and hear? Note: The clicking sound you hear comes from a Geiger counter, an instrument that detects the particles and energy emitted by decaying radioactive atoms: I see all the atoms decaying to daughter atoms. I hear a clicking sound kind of like the one you hear when popcorn pops 2. What remains at the end of the decay process? Only daughter atoms remain 3. Is the rate of decay fastest at the beginning, middle, or end of the process? It’s faster at the beginning Activity A: Decay curves Get the Gizmo ready:  Click Reset ( ). Be sure that User chooses half-life and Random decay are selected.  Check that the Half-life is 20 seconds and the Number of atoms is 128. Question: How do we measure the rate of radioactive decay? 1. Observe: Select the BAR CHART on the right side of the Gizmo and click Play. A. What happens to the numbers of radioactive and daughter atoms as the simulation proceeds? The number of radioactive atoms is going down and the number of daughter atoms is going up B. Do the numbers of radioactive and daughter atoms change at the same rate throughout the simulation? Explain: At the beginning of the simulation it seems as if the radioactive atoms are going down a lot faster than then daughter atoms, but at the same time I believe they are going at the same rate because as one radioactive atom goes away it becomes a daughter atom, so it must be moving at the same rate. As one radioactive atom goes down, one daughter atom goes up 2. Interpret: How does the Half-life setting affect how quickly the simulated substance decays? The higher the half-life is more seconds it takes for all the [Show More]

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