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Investigation 11:
How can we
produce
better foods?
Cooking is energy transfer in action! In this final phase, you'll consider thermochemical principlesβhow heat flows during baking, and how energy stored in food molecules can be measured or calculated.
Task: Complete your final report and presentation. Include caloric analysis, an explanation of energy transformations in your cooking process, and a justification for your chosen substitute based on energy, efficiency, and final product quality.
Driving Question:
π§ͺ How do the structure and properties of foods change as their components change?Β
Overview: Here, you'll focus on the energy changes that occur during chemical reactions. You'll learn to interpret enthalpy diagrams, understand the difference between endothermic and exothermic processes, and use bond enthalpies to estimate energy changes. This investigation connects chemistry to heat, calories, and how energy flows in systems.
Feel the Heat:
Where the Energy in Chemistry Comes From
Feel the Heat:
Where the Energy in Chemistry Comes From
Lifting weights, running laps, or even digesting food makes you feel warmerβbut why? This investigation explores how energy is stored in chemical bonds and how it flows during physical and chemical changes.
Energy in Chemical Bonds
EQ: How does breaking or forming chemical bonds affect energy flow?
Breaking bonds absorbs energy; forming bonds releases energy. The balance determines whether a reaction is endothermic or exothermic.
This explains why your body (or a reaction) gets hotβitβs about how bonds change and where energy goes.
π Textbook: 262-269
βοΈ Notes
Assignments:
πΒ
π Vocabulary:
Collision theory Activated complex
System Surroundings
Internal energy Enthalpy
Activation energy Thermochemical equation
Helpful Links:
Enthalpies of Formation and Reaction
EQ: How can we calculate the energy change in a reaction using known values?
Using standard enthalpies of formation, we can determine the overall energy absorbed or released in a reaction.
These values help us compare fuels, foods, or chemical systems based on how much energy they give or require.
π Textbook: 262-269
βοΈ Notes
Assignments:
πΒ
π Vocabulary:
Hess's law of heat summation
Standard enthalpy of reaction (ΞHΒ°)
Helpful Links:
Enthalpy in Changes of State
EQ: What happens to energy when substances melt, freeze, or boil?
Phase changes involve adding or removing energy without changing temperatureβthis is enthalpy of fusion or vaporization.
Your body uses energy to cool down (sweat evaporating) or warm up (burning fuel); chemistry explains why.
π Textbook: 262-269
βοΈ Notes
Assignments:
πΒ
π Vocabulary:
Helpful Links:
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