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Investigation 9:
How can we
produce
better foods?
What kind of chemical reactions are happening in the pan or oven? You'll identify signs of chemical change and consider which reactions are responsible for rising, browning, or hardening. You’ll plan and conduct an experiment using different versions of your pancake recipe to test how substitutions change the final product.
Task: Plan and carry out your recipe tests. Observe physical changes, record quantitative data (height, spread, etc.), and identify reaction types that might explain the differences.
Driving Question:
🧪 How do the structure and properties of foods change as their components change?
Overview: You'll dive into how chemical reactions are represented, balanced, and classified. This includes writing chemical equations, identifying reaction types (like synthesis and decomposition), and following the Law of Conservation of Mass. You'll also begin thinking about the energy involved in breaking and forming bonds.
Fueling Reactions: How Chemical Changes Power the World
Fueling Reactions: How Chemical Changes Power the World
Chemical reactions are all around us—from baking and rusting to powering rockets. But what’s really happening when substances react? In this investigation, you'll explore how atoms rearrange to form new substances, and how energy is absorbed or released in the process.
Modeling Chemical Reactions
EQ: How can we represent what happens when substances chemically change?
Chemical reactions can be shown with models, word equations, and chemical equations that identify the reactants and products involved. These representations help us visualize what's changing at the particle level.
Modeling shows us how atoms rearrange—and that this rearrangement is where the energy comes from, like in rocket fuels or food combustion.
📖 Textbook: 304-313
✏️ Notes
🔑 Vocabulary:
Reactants Products
Skeleton equation Coefficients
Exothermic Endothermic
Collision theory Reaction rate
Law of conservation of mass
Helpful Links:
Predicting Outcomes of Chemical Reactions
EQ: What patterns help us predict the products of chemical reactions?
Reactions follow predictable types—synthesis, decomposition, single and double replacement, and combustion—which help chemists anticipate what substances will form.
If we know what kind of reaction is occurring, we can predict whether it will release energy (exothermic) or require it (endothermic)—critical for designing anything from rocket engines to hand warmers.
📖 Textbook: 315-327
✏️ Notes
Assignments:
🔑 Vocabulary:
Combination reaction Synthesis reaction
Decomposition reaction Activity series
Single-replacement Double-replacement
Combustion Hydrocarbon
Helpful Links:
Reactions in Aqueous Solutions
EQ: What happens when ionic compounds react in water?
In aqueous solutions, ions can exchange partners and form precipitates, gases, or neutral compounds, depending on their solubility and reactivity.
Some energy-releasing reactions—like batteries and fuel cells—depend on chemical changes in solution, showing how chemistry powers devices and systems.
📖 Textbook: 329-335
✏️ Notes
Assignments:
🔑 Vocabulary:
Solvation Aqueous
Complete ionic equation Spectator ion
Net ionic equation Solvation shell
Precipitate
Helpful Links:
🎉 Investigation 9 Test
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