_Half-life Gizmos

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1101

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Chemistry

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Jan 9, 2024

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Name: Amani Date: Student Exploration: Half-life Directions: Follow the instructions to go through the simulation. Respond to the questions and prompts in the orange boxes. Vocabulary: daughter atom, decay, Geiger counter, half-life, isotope, neutron, radiation, radioactive, radiometric dating Prior Knowledge Questions (Do these BEFORE using the Gizmo .) 1. Have you ever made microwave popcorn? 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, the most popcorn pops at the beginning and not the end Gizmo Warm-up Like an unpopped 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 . The Half-life Gizmo allows you to observe and measure the decay of a radioactive substance. Be sure the sound is turned on and click Play ( ). 1. What do you see and hear? i see electricity, i hear popping Note: The clicking sound you hear comes from a Geiger counter , an instrument that detects the particles and energy emitted by decaying radioactive atoms. 2. What remains at the end of the decay process? blue dots 3. Is the rate of decay fastest at the beginning, middle, or end of the process? fast at the beginning and gradually getting slower Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved
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 . 1. What happens to the numbers of radioactive and daughter atoms as the simulation proceeds? the radioactive gets less at the daughter gets more 2. Do the numbers of radioactive and daughter atoms change at the same rate throughout the simulation? Explain. no, the radioactive decreases faster at the beginning and the daughter increases faster at the beginning 2. Experiment : Click Reset , and select the GRAPH tab. Run a simulation with the Half-life set to 5 seconds and another simulation with the Half-life set to 35 seconds. Sketch each resulting decay ✏ curve graph in the spaces below. 3. Interpret : How does the Half-life setting affect how quickly the simulated substance decays? the more to the left the line goes the faster the dots pop 4. Collect data : Click Reset . Change the Half-life to 10 seconds and click Play . Select the TABLE tab and record the number of radioactive atoms at each given time below. 0 0 10 s: 54 20 s: 157 30 s: 224 40 s: 258 50 s: 312 5. Analyze : What pattern, if any, do you see in your data? Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reserved ✏ Half-life = 5 seconds ✏ Half-life = 35 seconds
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