General Instructions

In this activity, you will read expository essays and explain the function of a catalyst in terms of reaction mechanisms and potential energy diagrams, list examples of catalysis in natural and industrial processes, and compare the functions of homogeneous and heterogeneous catalysts. You will also write a balanced chemical equation for a process given its reaction mechanism. To successfully achieve this, you will need to review all the study materials for module five on bonding and chemical interactions.

Step 1: Select and Reflect

Read the topic below and demonstrate your understanding of intermolecular forces in theoretical and practical settings.

• Intermolecular forces

Step 2: Respond

Using supporting data for your arguments, prepare a 300-350 word written piece that answers any of the following questions based on the scenario you selected. 

Case Scenario 1:

A catalyst is used to increase the rate of a chemical reaction. It does this by providing an alternative pathway for the reaction to take place with lower activation energy. In this experiment, two different catalysts are tested in the reaction of 2 molecules of A to form 1 molecule of B and 1 molecule of C. Catalyst 1 is a homogeneous catalyst, while catalyst 2 is a heterogeneous catalyst.

Experimental Numbers:

Catalyst 1:

Activation Energy: 10 kcal/mol

Reaction Rate: 0.2 mol/min

Catalyst 2:

Activation Energy: 7 kcal/mol

Reaction Rate: 0.3 mol/min

Questions:

1. How does the use of a catalyst affect the rate of a chemical reaction?
2. What is the difference between a homogeneous and heterogeneous catalyst?
3. How does the activation energy of a reaction influence the rate of the reaction?
4. How does the reaction rate of catalyst 1 compare to that of catalyst 2?
5. What factors might explain the difference in reaction rates between the two catalysts?

Case Scenario 2: 

Catalysis is an essential process in both natural and industrial processes. In nature, catalysts are used to speed up chemical reactions, allowing them to occur more quickly and efficiently. For example, enzymes such as cytochrome c are used in biological processes, such as the breakdown of glucose molecules into energy. In industry, catalysts are used to increase the efficiency and control of chemical reactions, resulting in products with fewer environmental impacts and lower costs. Catalysts are used to produce a wide variety of products, including fuels, drugs, detergents, plastics, and fertilizers.

Questions:

1. What are some natural processes that use catalysis?
2. How does using catalysts in industrial processes increase efficiency and reduce environmental impacts?
3. What types of products are produced by using catalysts in industrial processes?
4. How does the use of catalysts in industrial processes reduce costs?
5. What role does cytochrome c play in biological processes?

Case Scenario 3:

A chemist is conducting an experiment to compare the functions of homogeneous and heterogeneous catalysts. The chemist sets up two identical experiments, one with a homogeneous catalyst and one with a heterogeneous catalyst. In each reaction, the chemist adds the same amount of reactants and the same amount of catalyst. The chemist then measures the rate of reaction in both experiments and observes the differences between the two catalysts.

Questions:

1. What are the differences between homogeneous and heterogeneous catalysts?
2. How does the rate of reaction differ between the two catalysts?
3. What factors might affect the effectiveness of each catalyst?
4. What are the possible implications of using one type of catalyst over the other?
5. How could the experiment be improved to provide more accurate data?

Case Scenario 4:

A student is studying the reaction mechanism of a chemical reaction between two compounds, A and B. Compound A is a molecule with three carbon atoms and four oxygen atoms, while compound B is a molecule with four carbon atoms and three oxygen atoms. The student wants to determine the reaction rate between the two compounds and the products of the reaction.

To do this, the student first draws the Lewis structure of each compound. The Lewis structure of compound A shows two double bonds and two single bonds between the carbon and oxygen atoms. The Lewis structure of compound B shows three double bonds and one single bond between the carbon and oxygen atoms.

Next, the student draws a reaction mechanism diagram to illustrate the steps that occur in the reaction. According to this diagram, when compound A reacts with compound B, an intermediate compound C is formed. This intermediate compound C has two double bonds and two single bonds between the carbon and oxygen atoms.

The student then uses the reaction mechanism diagram to write a balanced chemical equation for the reaction. The equation shows that two molecules of compound A react with one molecule of compound B to form one molecule of intermediate compound C, and two molecules of product D.

Questions:

1. What is the Lewis structure of compound A?
2. What is the Lewis structure of compound B?
3. What is the intermediate compound formed when compound A reacts with compound B?
4. How many molecules of compound A and compound B are needed to form one molecule of intermediate compound C?
5. What are the products of the reaction between compound A and compound B?
6. Write a balanced chemical equation for the reaction between compound A and compound B.

Step 3: Share 

To share your work, click on the “Add a new discussion topic” button under this post and paste your work into the “Message” box. Make sure to reference others’ intellectual property when necessary. All references should follow 7th Edition APA formatting. For further instructions, see the resource on the Himmelfarb Health Sciences Library: APA citation resource (N.B.: references are excluded from word counts).

Step 4: Interact 

To complete the activity, you will need to reply to at least two posts made by your peers respectfully and professionally. Be sure your post engages your peers' ideas by including a reflection on their comments, sharing ideas on other potential difficulties and parties involved, or asking thought-provoking questions. If a peer comments on your posting, please reply. To post a reply, click “Reply” on a particular discussion, write your feedback, and click “Post to the forum.”

OPTIONAL Step 5: Interact (10 minutes)

If you would like to, you can reply to your peers' posts in a respectful and professional manner. Ensure that your post engages your peers' ideas by including a reflection on their comments, sharing ideas of other potential difficulties and parties involved, or asking thought-provoking questions. If a peer comments on your posting, please reply. To post a reply, click “Reply” on a particular discussion, write your feedback and then click on “Post to forum.”