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Unit 2: Chemical Interactions Chapter 6: Chemical Reactions

Unit 2: Chemical Interactions Chapter 6: Chemical Reactions. Big Idea: Chemical reactions are processes in which atoms are rearranged into different combinations of molecules. 4 Sections. Observing Chemical Change Describing Chemical Reactions Controlling Chemical Reactions

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Unit 2: Chemical Interactions Chapter 6: Chemical Reactions

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  1. Unit 2: Chemical InteractionsChapter 6: Chemical Reactions Big Idea: Chemical reactions are processes in which atoms are rearranged into different combinations of molecules

  2. 4 Sections • Observing Chemical Change • Describing Chemical Reactions • Controlling Chemical Reactions • Fire & Fire Safety Mrs. Lee - Ch 6

  3. Sec 1: Observing Chemical Change KEY CONCEPTS • Changes in matter can be described in terms of physical changes & chemical changes • Chemical changes occur when bonds break & new bonds form • Chemical reactions involve changes in properties & changes in energy that you can observe Mrs. Lee - Ch 6

  4. Matter Chemistry Physical property Chemical property Physical change Chemical change Reactant Product Precipitate Endothermic reaction Exothermic reaction Sec 1: Key Terms Mrs. Lee - Ch 6

  5. Sec 2: Describing Chemical Reactions KEY CONCEPTS • Chemical equations use chemical formulas & other symbols instead of words to summarize a reaction • In chemical reactions, the number of atoms stays the same no matter how they are arranged, so their total mass stays the same Mrs. Lee - Ch 6

  6. Sec 2: Describing Chemical Reactions (cont’d) • To describe a reaction accurately, a chemical equation must show the same number of each type of atom on both sides of the equation • 3 general types of chemical reactions are synthesis, decomposition & replacement Mrs. Lee - Ch 6

  7. Chemical equation Conservation of matter Open system Closed system Coefficient Synthesis Decomposition Replacement Sec 2: Key Terms Mrs. Lee - Ch 6

  8. Sec 3: Controlling Chemical Reactions KEY CONCEPTS • All chemical reactions require a certain amount of activation energy to get started • Factors that affect rates of reaction include surface area, temperature, concentration & the presence of catalysts or inhibitors Mrs. Lee - Ch 6

  9. Activation energy Concentration Catalyst Enzyme Inhibitor Sec 3: Key Terms Mrs. Lee - Ch 6

  10. Sec 4: Fire & Fire Safety KEY CONCEPTS • The following 3 things are necessary to start & maintain a fire: 1) fuel 2) oxygen 3) heat • If you know how to prevent fires in your home & what to do if a fire starts, you are better prepared to take action Mrs. Lee - Ch 6

  11. Combustion Fuel Sec 4: Key Terms Mrs. Lee - Ch 6

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