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Gateways to Science Grade 8 for Teachers resources

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Lesson 8: Analyzing Chemical Formulas Copy the following formulas into your science notebook. Determine the number Unit 2: of atoms per element represented in each of the following substances. Justify your answers mathematically or with a drawing. 4. 3CO2 2 x 1 sulfur = 2 atoms Matter and Energy 3 x 1 carbon = 3 atoms 3 x 2 oxygen = 6 atoms 5. 2CaSO3 2 x 1 calcium = 2 atoms 2 x 3 oxygen = 6 atoms 6. 2Ca(OH)2 2 x 1 calcium = 2 atoms 2 x (1 x 2) oxygen = 4 atoms 2 x (1 x 2) hydrogen = 4 atom Facilitation Questions • What is a coefficient and what does it tell you? A coefficient is a number written in front of a chemical formula indicating how many of those molecules are involved in a chemical reaction. • What is a subscript and what does it tell you? A subscript is a number within a chemical formula indicating the number of atoms of an element in that molecule. 125 © REGION 4 EDUCATION SERVICE CENTER. ALL RIGHTS RESERVED.

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