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Describing Chemical Reactions

Describing Chemical Reactions. Chapter 6.2 Page 224. Section 2: Describing Chemical Reactions. What information does a chemical equation contain? How is matter conserved during a chemical reaction? What must a balanced chemical equation show? What are three types of chemical reactions?.

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Describing Chemical Reactions

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  1. Describing Chemical Reactions Chapter 6.2 Page 224

  2. Section 2:Describing Chemical Reactions • What information does a chemical equation contain? • How is matter conserved during a chemical reaction? • What must a balanced chemical equation show? • What are three types of chemical reactions?

  3. Chemical Formulas The chemical formula of a compound identifies the elements in the compound and the ratios in which their atoms are present. What do the following chemical formulas tell you?

  4. What Are Chemical Equations? • Chemical equations use chemical formulas and other symbols instead of words to summarize a reaction.

  5. Conservation of Matter • The principle of conservation of matter states that in a chemical reaction, the total mass of the reactants must equal the total mass of the products.

  6. Conservation of Matter • In chemical reactions, the number of atoms stays the same. They are just rearranged to form different substances. 6H2O + 6CO2 C6H12O6 + 6O2 water + carbon dioxide glucose + oxygen PHOTOSYNTHESIS

  7. Balancing Chemical Equations • To describe a reaction accurately, a chemical equation must show the same number of each type of atom on both sides of the equation.

  8. Balancing Equations Activity • Click the Active Art button to open a browser window and access Active Art about balancing equations.

  9. Balancing Chemical Equations • Magnesium (Mg) reacts with oxygen gas (O2), forming magnesium oxide (MgO). To write a balanced equation for this reaction, first write the equation using the formulas of the reactants and products, then count the number of atoms of each element.

  10. Balancing Chemical Equations: Balance the equation for the reaction of sodium metal (Na) with oxygen gas (O2), forming sodium oxide (Na2O). Balancing Chemical Equations

  11. Balancing Chemical Equations: Balance the equation for the reaction of tin (Sn) with chlorine gas (Cl2), forming tin chloride (SnCl2). Balancing Chemical Equations

  12. Classifying Chemical Reactions • Many chemical reactions can be classified in one of three categories: synthesis, decomposition, or replacement. Synthesis – combining two or more substances to make a more complex substance Decomposition – breaking compounds down into simpler substances Replacement – when one element replaces another in a compound

  13. End of Section:Describing Chemical ReactionsWork on Cornell Notes for 6.2

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