Question

1. Define the following terms: a. Activation Energy b. Exothermic Reaction 2. Explain what Le Chatelier's Principle states False True False 3. According to Collision Theory, surface area is directly related to reaction rate True 4. According to Collision Theory, reaction temperature is indirectly related to reaction rate 5. Determine the equilibrium constant K for the following reaction: H+ (aq) + OH(aq) = H20 (1) Keg 6. Determine the value of Key for the reaction CH4 (g) + 2H S(g) = CS, (g) + 4H2(g) + Heat where [CH] = 0.0005M, [HS] = 0.065M, [CS2] =0.0025M, [H2] = 0.126M [This reaction applies to Question #7: 2CH2(g) + 502(g) + heat 4CO, (g) + 2 H20 (g) 1 7. State in which direction (. , or no effect) the above reaction will proceed in response to the following changes: a. Decrease in gas pressure b. Increase in concentration of CO c. Decrease in Temperature d. Addition of a catalyst 8. Write the balanced chemical reaction that produced the following Ke expression and where H20 () is also a reactant: [CH,COO (aq)][H,O* (aq)] [CH,COOH(aq)]

Answer 1

1) Activation energy is the minimum amount of energy that is required to activate atoms or molecules to a condition in which they can undergo a chemical transformation or physical transport.

2) An exothermic reaction is a chemical reaction that releases energy through light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: reactants → products + energy.

3) This is true. Increasing the surface area of a solid reactant exposes more of its particles to attack. This results in an increased chance of collisions between reactant particles, so there are more collisions at any given time and the rate of reaction increases.

4) This is also true. Usually conducting a reaction at a higher temperature delivers more energy into the system and increases the reaction rate by causing more collisions between particles, as explained by collision theory.