1. What is a chemical reaction?

• When one chemical changes by itself
• When two or more chemicals come together to make a change
• When things go faster then they normally do.
• When change leads to something new

2. A classmate states that all living things, such as plants and humans, CREATE the atoms they need in order to make or obtain these molecules. Is this statement completely accurate? Be sure to refer to either your model or the models from the phenomenon at least twice when justifying your response.

3. How is energy stored in these molecules?

• Energy is stored in the bonds between atoms.
• Energy is stored in each of the atoms, such as C, H, or O.
• Energy is stored when we break atoms apart in digestion.
• Energy is stored when we chemically combine these molecules and oxygen.

4. What is the most important purpose for breaking food down into these smaller molecules?

• We’re able to release energy from the larger molecules to form these molecules.
• We’re able to use these smaller molecules to build all the things we need to stay alive.
• The food we eat gives us energy, but we use oxygen that we breathe to create most of the molecules we need to survive.
• From these smaller molecules, we can build bigger molecules, which gives us energy we can use.

5. What patterns do you see in the letters in all these molecules?

6. How do different living things, such as plants and humans, get the atoms they need in order to make or obtain these molecules?

7. In the space below, draw a model to show how a hamburger might become these four types of molecules and also be used for energy.

8. Explain in words how your model shows how a hamburger might become these four types of molecules and also be used for energy.