Based on your observations, develop a model to describe how the following changes impact a chemical system at equilibrium Increasing the concentration of a reactant in a system Decreasing the concentration of a reactant in a system Increasing the concentration of a product in a system Decreasing the concentration of a product in a system Adding heat to a system Removing heat from a system Model Format Reactants Products Change applied Expected direction of shift Explanation Increasing the concentration of a reactant in a system Shift right toward product Because an increase in reactant then the system needs to adjust for equilibrium by shifting to the opposing side Decreasing the concentration of a reactant in a system Increasing the concentration of a product in a system Decreasing the concentration of a product in a system
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Use the table below to complete the following:
Based on your observations, develop a model to describe how the following changes impact a chemical system at equilibrium
Increasing the concentration of a reactant in a system
Decreasing the concentration of a reactant in a system
Increasing the concentration of a product in a system
Decreasing the concentration of a product in a system
Adding heat to a system
Removing heat from a system
Model Format
Reactants Products
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Change applied |
Expected direction of shift |
Explanation |
|
Increasing the concentration of a reactant in a system |
Shift right toward product |
Because an increase in reactant then the system needs to adjust for equilibrium by shifting to the opposing side |
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Decreasing the concentration of a reactant in a system |
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Increasing the concentration of a product in a system |
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Decreasing the concentration of a product in a system |
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Adding heat to a system Reactants + heat ⇋ Products |
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Adding heat to a system Reactants ⇋ Products + heat |
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Removing heat from a system Reactants + heat ⇋ Products |
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Removing heat from a system Reactants ⇋ Products + heat |
Part II
Next, you will perform some tests on the iron thiocyanate system described in the equation below and record your observations.
System
Fe3+(aq) + SCN–(aq) ⇆ FeSCN2+(aq) + heat
Yellow Colorless Orange-Red
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Test Tube |
Procedure |
Predictions (what color will you see) |
Observations |
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1 |
No tests (control) |
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2 |
Add 0.1M KSCN drop wise until change is observed *increases concentration of SCN- in the system |
Right Orange redder |
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3 |
Add 4.0M NaCl drop wise until change is observed *decreases concentration of Fe3+ in the system |
1.Right 2. yellow
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Left and yellow |
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4 |
Add 0.1M Fe(NO3)3 drop wise until change is observed *increases concentration of Fe3+ in the system |
Right orange |
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5 |
Add 0.05M AgNO3 drop wise until change is observed *decreases concentration of SCN- in the system |
Left yellow |
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6 |
Place in hot water bath for 1-2 minutes *adds heat to the reaction system |
left |
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7 |
Place in ice water bath for 1-2 minutes *removes heat from the reaction system |
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Refined Model - only make additions if the model changed.
Reactants Products
|
Change applied |
Expected direction of shift |
Explanation |
|
Increasing the concentration of a reactant in a system |
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Decreasing the concentration of a reactant in a system |
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Increasing the concentration of a product in a system |
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Decreasing the concentration of a product in a system |
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Adding heat to a system Reactants + heat ⇋ Products |
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Adding heat to a system Reactants ⇋ Products + heat |
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Removing heat from a system Reactants + heat ⇋ Products |
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Removing heat from a system Reactants ⇋ Products + heat |
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