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3rd Nine Weeks Exam
Standard 8
| Question | Answer |
|---|---|
| The study of chemical reaction rates | kinetics |
| The reaction rate is how ___ or ___ the reaction is occurring | fast; slow |
| The reaction rate is how fast or slow the _____ are becoming _______ | reactants; products |
| Rate = change in quantity (______) divided by the change in ____ | concentration; time |
| Concentration is usually expressed a | molarity (mol of solute per Liter of solution) |
| Time is usually expressed in | seconds |
| The unit for the reaction rate is _____ or _____ | M/s or mol/L s |
| Concentration is represented by placing _____ around the reactant or product. | brackets |
| [H2O2 ] represents the _______ of hydrogen peroxide. | concentration |
| As the reaction proceeds the concentration of the reactant, hydrogen peroxide will | decrease |
| As the reaction proceeds the concentration of the products, water and oxygen will | increase |
| The equation is average reaction rate = ∆ [reactant] / ∆ time = OR average reaction rate = ∆ [product] / ∆ time = | 1. - [reactant] t2 - [reactant]t 1 / t 2 - t 1 2. [product] t2 - [product]t 1 / t 2 - t 1 |
| You have 6.0 M H2 2 initially (time 0s). After 5.0 seconds, you have 5.0 M H2O2. What is the reaction rate? | Average reaction rate = ∆ [reactant] / ∆ time = - (5.0M – 6.0 M) / 5.0 s – 0 s = 1.0 M / 1.0 s = 1.0 M/s |
| In nature, this decomposition of hydrogen peroxide reaction takes place very | slow |
| Name another reaction, in nature, that takes place slowly: | iron rusting |
| What could speed up the reaction rate? | a. Light energy b. Heat energy c. Different concentrations of the reactant d. Catalysts |
| Catalysts that make it harder for the reaction to occur are called | inhibitors |
| Catalysts change the activation energy. Catalysts usually ____ the activation energy making the reaction occur faster. | lower |
| The minimum amount of energy needed to start a reaction is the ______ energy | activation |
| Breaking bonds releases energy | exothermic reaction |
| Forming bonds stores energy | endothermic |
| Reaction rates occur and vary according to the kinetic molecular theory which states that the particles of matter are in _____. They are constantly _____. These collisions result in the forming and breaking of _____. | motion; colliding, bonds |
Created by:
mckay05
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