Question

UNIT 2: Course Activity: Building a Device that Uses Energy from Chemical Reactions

Part A: Identify the problem that the cold pack must address.
A. Keeping drinks cold
B. Generating electricity
C. Cooling a fever
D. Providing heat

Part B: Criteria are the specific goals of the design. List at least two criteria for the design based on the question, What do you want it to do?
A. React quickly and efficiently
B. Be cost-effective and easy to use
C. Be lightweight and compact
D. Create a colorful display

Part C: Constraints are the limits that we place on a design. Time, materials, or money may be in short supply. Some designs may also be limited by how the product gets used. List at least one constraint on the cold pack design.
A. Limited budget
B. Abundant resources
C. No time restrictions
D. No need for user-friendly design

Part D: Brainstorm ideas about how to separate the three reactants in the cold pack. Draw your ideas and use text boxes to explain them.
A. Drawing and explanation provided in the task.
B. Drawing and explanation provided in the task.
C. Drawing and explanation provided in the task.
D. Drawing and explanation provided in the task.

Part E: Create drawings of two fully worked-out ideas for mixing the reactants in the cold pack. Use text boxes to explain your ideas.
A. Drawing and explanation provided in the task.
B. Drawing and explanation provided in the task.
C. Drawing and explanation provided in the task.
D. Drawing and explanation provided in the task.

Part F: What are the pros and cons of each idea that you explored in part E? How do the ideas compare?
A. Pros and cons provided in the task.
B. Pros and cons provided in the task.
C. Pros and cons provided in the task.
D. Pros and cons provided in the task.

Part G: Select one of your cold pack mixing mechanisms, and use items from the materials list to build a prototype. The prototype doesn’t have to be true to size, but the mechanism for combining the reactants must work. You’ll test the prototype later, so make sure to line the compartment that holds the water with a plastic bag. Describe what you did.
A. Description provided in the task.
B. Description provided in the task.
C. Description provided in the task.
D. Description provided in the task.

Part H: Test your prototype. Pour ½ cup of water into the compartment that holds the water. Add 2 teaspoons of baking soda to each of the compartments that hold the solid reactants. Test your mechanism for combining the reactants. Did the prototype work? Record the results of your test here.
A. Test results provided in the task.
B. Test results provided in the task.
C. Test results provided in the task.
D. Test results provided in the task.

Part I: Based on the test of your prototype, refine your design and make a final drawing. Use text boxes to label the final design and to note changes that you made.
A. Final design and changes provided in the task.
B. Final design and changes provided in the task.
C. Final design and changes provided in the task.
D. Final design and changes provided in the task.

Answer 1

The subject is cooling a fever with a cold pack that works quickly and is affordable. One must design a prototype within budget constraints, test the prototype, and refine the design to meet criteria effectively.

Step-by-step explanation:

The problem that the cold pack must address is C. Cooling a fever as it's designed to provide a cooling effect in medical or first aid scenarios. Based on the given task, two primary criteria for the design of the cold pack could be A. React quickly and efficiently and B. Be cost-effective and easy to use, ensuring that it activates promptly during emergency use and is affordable for consumers and healthcare providers. One constraint on the design might be A. Limited budget, which impacts the materials and technology that can be incorporated into the cold pack.

Part D requires a creative approach to separate three reactants in the cold pack. Design ideas must be presented with drawings and explanations, considering how to keep these reactants separate until activation. In part E, the task is to create drawings of two distinct mechanisms for mixing the reactants, again using text and visual aids to explain how each idea works. Each design's pros and cons are discussed in part F, with an evaluation of factors like effectiveness, cost, simplicity, and portability.

For part G, a prototype based on one of the proposed mixing mechanisms is built using materials from a list provided in the task. The design is tested in part H, where the mechanism's functionality is verified by combining water with baking soda, simulating the actual reactants in a chemical cold pack.