A single proton or neutron has a mass of approximately one atomic mass unit. The unit āuā refers to unified atomic mass units. What is the average mass of a copper atom? The average mass of a copper atom is 63.546 U. On the AVOGADRO CONSTANT tab, place the copper (Cu) atom on the nano-balance on the left, which will show the average atomic mass of copper rather than the mass of a single copper atom. In the Moles Gizmo, you will learn about a unit used to count atoms. If you are counting atoms, however, a dozen is not much help. Gizmo Warm-up When counting roses, eggs, or donuts, a dozen is a good unit to use. I would not expect them to all have the same mass, each individually weigh differently. Even though you have the same number of each, would you expect them all to have the same mass? Explain. Suppose you have a dozen carbon atoms, a dozen gold atoms, and a dozen iron atoms. Would a dozen of each object have the same mass? A dozen eggs would have a different mass than a dozen doughnuts. How many of each item do you have? You have a dozen of each item, 12. In the image to the right, note a dozen eggs, a dozen donuts and a dozen roses. Vocabulary: atomic mass, Avogadro constant, conversion factor, dimensional analysis, mole, molar mass, molecular mass, scientific notation, significant figures, unified atomic mass unit Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Respond to the questions and prompts in the orange boxes. Student Exploration: Moles Directions: Follow the instructions to go through the simulation.
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