Chemical Reactions
Basic definition of a chemical reaction
A process in which substances interact, causing the formation of new substances with different properties.
What is energy transfer?
The movement of energy from one place or object to another.
What are the first steps in the engineering design process?
Identify the problem, research, brainstorm, and choose the best idea.
How can flameless heaters impact the environment?
Waste products, resource use, and energy efficiency.
Name a real-world application of a chemical reaction
Cooking, cleaning, manufacturing, etc.
Name a common exothermic reaction
Combustion, like burning wood or fossil fuels.
Describe how energy is transferred in a flameless heater
Heat is generated by the chemical reaction, transferring energy to the food and container.
What are criteria and constraints in a design?
Criteria are the desired elements of a design; constraints are the limitations.
What is a carbon footprint?
Total amount of CO2 and other greenhouse gases emitted by a product or service.
How are flameless heaters used in emergency situations?
For heating food in areas without conventional cooking facilities.
How can we tell a chemical reaction has occurred?
Change in color, temperature, formation of a precipitate, or gas production.
Difference between exothermic and endothermic reactions
Exothermic reactions release heat, endothermic absorb heat.
Importance of prototypes in engineering
They allow for practical testing and iteration of the design.
Effects of chemical waste on ecosystems
Can lead to pollution, harm wildlife, and disrupt natural processes.
Example of a chemical reaction in cooking
Baking, where heat causes chemical reactions in the dough.
Role of reactants in a chemical reaction
Substances that undergo chemical change.
How does changing the amount of reactants affect energy transfer?
More reactants typically mean more energy is released or absorbed, affecting the temperature change.
How can testing and feedback improve a design?
Iterative testing leads to improvements based on real-world performance.
Discuss the concept of sustainability in design
Creating products and processes that are environmentally friendly and sustainable.
How does the choice of materials affect the efficiency of a product?
The choice of eco-friendly, recyclable, or durable materials can reduce environmental impact and improve user experience.
Explain how a flameless heater works based on chemical reactions
By a chemical reaction that produces heat when certain substances are mixed.
What is the principle of conservation of energy?
Energy cannot be created or destroyed, only converted from one form to another.
Steps to optimize a product design
Revising designs based on testing, feedback, and reevaluation of criteria and constraints.
Long-term environmental impacts of widespread use of technology
Potential for long-term harm or benefits, like climate change or conservation efforts.
Innovations in material science that have improved everyday products
Nanotechnology in fabrics, biodegradable materials, and energy-efficient building materials.