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23 Cards in this Set
- Front
- Back
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What has to ocurr for an reaction? |
The hit has to be hard enough and just aligned right. A minimum of energy is required to get a reaction started. |
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Activation energy |
The energy threshold that must be overcome to produce a chemical reaction. |
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Reaction rate |
1) The rate at which the concentration of the reactants decrease. 2)Measurement of the change in quantity of a reactant or product against time. |
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Equilibrium state |
When a reactions forward progress (reactants forming products) is perfectly balanced with the reverse progress (products changing back into reactants) |
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What does the Maxwell-Boltzman distribution look like? |
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What influences the reaction rate? |
Temperature. Surface area. Concentration. Pressure. Catalyst. |
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What does temperature do to the reaction rate? |
Raising the temperature will: make particles collide more often. This makes it more likely that collisions result in a reaction. The number of particles with greater activation energy has roughly doubles for 10 degrees. |
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How does surface area affects the reaction rate? |
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What is a catalyst? What does it do with the reaction rate? |
A substance which speeds up a chemical reaction. At the end of the reaction the catalyst remains chemically unchanged. |
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What does pressure do when we have a gaseous reaction? |
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What happens when the concentration is increased? |
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What is le chateliers principle? |
If stress is placed on a system at equilibrium the system will proceed in a direction that minimizes the stress. |
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What is needed for an equilibrium to stay at equilibrium? |
Closed system. Certain temperature. |
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Dynamic equilibrium |
The forward and backward reactions will be going at the same rate. |
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Can you explain the graphs of a dynamic equilibrium? |
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What happens to a system in equilibrium when you increase T? |
The system will favour the endothermic reaction. |
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What happens to a system at equilibrium when you decrease T. |
It will favour the exothermic reaction. |
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What happens to equilibrium when pressure is changed? |
It will lower the concentration of products or educts depending on their miles in a gaseous equilibrium |
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What is the equilibrium constant Kc? |
A molar ratio of products over reactants at equilibrium. |
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Difine RICE |
Reaction. Initial. Change. Equilibrium. |
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What is molarity? |
Number of molecules of solute per liters of solution mol/liter |
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Formulas for reaction rates. |
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Kc is over 1 and Kc is under 1. Explain the position of equilibrium in both cases. |
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