Chemical Equilibrium: Data Sheet Name Fill in the following table: Substance Test added Equilibrium shifted towards Color Trial 2 Equilibrium shifted Color Trial 1 tube Temperature change towards Reference Reference Reference color: 1o drops water 1 8 drops Fe CNO3)2 Dark Red DaK Red. 8 drops Dork Red Dark Red 3 KSCN 8 drops Light Light 4. Oronge Oronge HCI

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Chapter1: Chemical Foundations
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**Chemical Equilibrium: Data Sheet**

**Instructions:** Fill in the following table.

| Test Tube | Substance Added / Temperature Change | Reference Color | Color Trial 1 | Color Trial 2 | Equilibrium Shifted Towards |
|-----------|------------------------------------|-----------------|---------------|---------------|-------------------------------|
| 1         | 10 drops water                     | Dark Red        | Reference     |               | Reference                      |
| 2         | 8 drops Fe(CN)3                    | Dark Red        | Dark Red      |               |                               |
| 3         | 8 drops KSCN                       | Dark Red        | Dark Red      |               |                               |
| 4         | 8 drops HCl                        | Light Orange    | Light Orange  |               |                               |

Note: The table includes test tube numbers, substances added, reference colors, observations of color changes during trials, and whether the equilibrium shifted.
Transcribed Image Text:**Chemical Equilibrium: Data Sheet** **Instructions:** Fill in the following table. | Test Tube | Substance Added / Temperature Change | Reference Color | Color Trial 1 | Color Trial 2 | Equilibrium Shifted Towards | |-----------|------------------------------------|-----------------|---------------|---------------|-------------------------------| | 1 | 10 drops water | Dark Red | Reference | | Reference | | 2 | 8 drops Fe(CN)3 | Dark Red | Dark Red | | | | 3 | 8 drops KSCN | Dark Red | Dark Red | | | | 4 | 8 drops HCl | Light Orange | Light Orange | | | Note: The table includes test tube numbers, substances added, reference colors, observations of color changes during trials, and whether the equilibrium shifted.
**Chemical Equilibrium**

**Objective**

To observe and explain equilibrium shifts based on Le Chatelier’s Principle.

**Introduction**

In any chemical reaction, reactants are converted to products. In some cases, some of the products are converted back to reactants. Such reactions are called reversible reactions where reactants are converted to products (forward reaction) and products are converted back to reactants (reverse reaction). When the rate of the forward reaction becomes equal to the rate of the reverse reaction, we say that the reaction is at equilibrium. At this point, there is no change in the concentration of the reactants and the products.

We can disturb a reaction at equilibrium by changing the concentration, pressure/volume, or temperature. Le Chatelier’s Principle states that a reaction (system) at equilibrium will stay at equilibrium until acted upon by some outside force that changes the equilibrium conditions—for example, by adding a greater concentration of one of the products or reactants. The system will then adjust to return to equilibrium by counteracting the change that has just been made.

Some examples of stresses and how the equilibrium system responds to counteract those stresses are as follows:

**Change in Concentration**

- If we add a reactant, the equilibrium will shift towards the products. This is because a portion of the added reactant will be used up to form more products until the equilibrium is re-established.
- If we remove a reactant, then to compensate for the loss of the reactants, the product will decompose to form reactants and therefore the equilibrium will shift towards the reactants.
- If we add a product, the equilibrium will shift to the reactants in order to consume the excess product.
- If we remove a product, then to compensate for the loss of the products, more product will be formed from the reactants and the equilibrium will also shift towards the products.

**Changes in Temperature**

- An endothermic process will be favored (shifting towards the formation of products) by an increase in temperature. The reaction shifts in the direction that absorbs heat to counteract the increase in temperature.
- An exothermic process will be favored (shifting towards the formation of products) by a decrease in temperature. The reaction shifts in the direction that releases heat to counteract the decrease in temperature.

During this lab, you will investigate Le Chatelier’s Principle using iron(III)-thiocyanate equilibrium. You will be combining Fe(NO₃)₃, (iron
Transcribed Image Text:**Chemical Equilibrium** **Objective** To observe and explain equilibrium shifts based on Le Chatelier’s Principle. **Introduction** In any chemical reaction, reactants are converted to products. In some cases, some of the products are converted back to reactants. Such reactions are called reversible reactions where reactants are converted to products (forward reaction) and products are converted back to reactants (reverse reaction). When the rate of the forward reaction becomes equal to the rate of the reverse reaction, we say that the reaction is at equilibrium. At this point, there is no change in the concentration of the reactants and the products. We can disturb a reaction at equilibrium by changing the concentration, pressure/volume, or temperature. Le Chatelier’s Principle states that a reaction (system) at equilibrium will stay at equilibrium until acted upon by some outside force that changes the equilibrium conditions—for example, by adding a greater concentration of one of the products or reactants. The system will then adjust to return to equilibrium by counteracting the change that has just been made. Some examples of stresses and how the equilibrium system responds to counteract those stresses are as follows: **Change in Concentration** - If we add a reactant, the equilibrium will shift towards the products. This is because a portion of the added reactant will be used up to form more products until the equilibrium is re-established. - If we remove a reactant, then to compensate for the loss of the reactants, the product will decompose to form reactants and therefore the equilibrium will shift towards the reactants. - If we add a product, the equilibrium will shift to the reactants in order to consume the excess product. - If we remove a product, then to compensate for the loss of the products, more product will be formed from the reactants and the equilibrium will also shift towards the products. **Changes in Temperature** - An endothermic process will be favored (shifting towards the formation of products) by an increase in temperature. The reaction shifts in the direction that absorbs heat to counteract the increase in temperature. - An exothermic process will be favored (shifting towards the formation of products) by a decrease in temperature. The reaction shifts in the direction that releases heat to counteract the decrease in temperature. During this lab, you will investigate Le Chatelier’s Principle using iron(III)-thiocyanate equilibrium. You will be combining Fe(NO₃)₃, (iron
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