Using the sliders, add a single C-12 atom and a single C-13 atom to the chamber. Select Percent for the y -axis and turn on Weighted average. C. What can you conclude about the role of neutrons in forming new isotopes? When an element's quantityof neutrons changes, a newisotope is created. ConsiderC-13 as an example it is anentirely new isotope andonly has one additionalneutron than C-12. B. How does the neutron number in each compare? Additionally, there are 6neutrons in C-12 and 7 inC-13. A. How does the proton number in each isotope compare? There are 6 protons in C-12and 6 protons in C-13. Question: How do the amounts of each isotope affect the average mass of a mixture of atoms of thesame element? 1. Compare: The mass number of C-12 is 12, a value representing the total number of protons and neutrons in the nucleus. Since both protons and neutrons have masses that are just over 1 u, the mass number willtypically be very close to the atom’s mass. Add a few atoms each of C-12 and C-13 to the chamber, press Release atoms , and then click on the bars of the graph to reveal a close-up image of each isotope. Introduction: Atomic masses are expressed in unified atomic mass units (u), where 1 u is equal to the 1 12 mass of a C-12 atom. Check that Carbon is selected from the drop-down menu and Custom Isotope mix is chosen.Activity A: Weightedaverages Get the Gizmo ready: B. Which atoms are deflected the most by the magnetic field? The atoms that are Reproduction for educational use only. Public sharing or posting prohibited. © 2020 ExploreLearning™ All rights reservedĢ. What is the relationship between the amount of deflection and the mass of the isotope? The most deflection will be felt by the atoms with the smallest masses, not the ones withbigger masses. A. Do the ions travel in a straight path or a curved path? The path of the ions iscurvy. 1. In the mass spectrometer, atoms are vaporized (turned into a gas) and ionized (stripped of electrons). The charged particles are then shot through a tube surrounded by electromagnets. Click Release atoms and observe the particles as they hit the detector. Use the sliders to add about 20 atoms each of Carbon-12 and Carbon-13 to the chamber. To begin, check that Carbon is selected and the Isotope mix is Custom. In the Average Atomic Mass Gizmo, you will learn how to find the average mass of an element using an instrument called a mass spectrometer. Gizmo Warm-up Just like cans of soup, atoms of the same element often have differentmasses. These different varieties are called isotopes. B. How close was your prediction? Without doing any calculations, Iestimated it to be 300g, therefore I was100g off from the actual average mass.However, I did anticipate that it wouldbe smaller and more universal in size. A. What is the average mass of a can of soup? 200g is the typical mass of a soup can. Estimate: 300g 2. Now calculate the average mass by adding up the masses of all the cans and dividing by the total number of cans. Vocabulary : average atomic mass, isotope, mass defect, mass number, mass spectrometer, nuclear binding energy, unified atomic mass unit, weighted average Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. In the image to the right, the cans of soup have different masses. Without doing the math, estimate the average massof a can of soup. Name: Cohen Beasley Date: 04-13-2022 Student Exploration: Average Atomic Mass Directions: Follow the instructions to go through the simulation. Respond to the questions andprompts in the orange boxes.
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