Chapter 13 Section 4 Rates of Reaction You will have only one question today for bell work. You MUST JUSTIFY your answer!

Bell Work 2/8/17

Bell Work 2/8/17

Review SYNTHESIS: A + B  AB DECOMPOSITION: AB  A + B SINGLE- DISPLACEMENT: A + BX  AB + X DOUBLE DISPLACEMENT: AX + BY  AB + XY

Success Criteria: I can describe an endothermic reaction. I can describe an exothermic reaction. I can describe the difference between a catalyst and an inhibitor. TOC: #22. Rates of Reactions Notes #23. Ch 13, section 4: Activation Energy

Chemical reactions All Chemical reactions require chemical energy. Video All Chemical reactions require chemical energy. Energy is released or absorbed during the reaction.

Exothermic reaction Video If the reactant energy is greater than the product energy, energy is released. A chemical reaction where the energy is released is called an exothermic reaction. “EXO” – go out “thermic” -- heat

Endothermic Reaction If the reactant energy is less than the product energy, energy is absorbed. A chemical reaction where energy is absorbed is called an endothermic reaction. “ENDO” – go in “thermic” -- heat

Activation Energy Activation energy – minimum amount of energy needed to start a reaction. There must be something to get the reaction started. Sources of activation energy –friction, electric spark, light The rate of reaction is the measure of how rapidly a reaction takes place.

Five factors that can affect the rate of reaction: 1. Temperature increases rate of reaction because particles are moving faster. 2. Concentration increases rate of reaction because the amount of particles increases. 3. Surface area increases rate of reaction because of the exposed surface increases. 4. A catalyst is something that speeds up a reaction without being changed. 5. An inhibitor is something that slows down a reaction without being changed.

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