1. Review of Lessons 1 & 2 IQWST Chemistry Unit

2. Background Information…. We reviewed some basic chemistry concepts at the beginning of this unit (states of matter, parts of the atom, etc.) which led us to some ideas about matter! What can you remember about the different states of matter? (remember the “all about matter” worksheet)

3. Is air matter? Please explain!

4. Are atoms matter? Yes! Atoms are matter. Although they are very tiny, they have mass and take up space. All matter is made of atoms. What are the parts of the atom? Protons, Neutrons, Electrons What are molecules made of? Atoms!

5. Back to the question of air being matter… Air is matter because it has volume and mass. All matter has volume and mass. What are some ways you could measure the volume of an object? What about the mass? Give an example of a unit of measure you would use for volume.

6. Is air a mixture?? YES! Air is a mixture of many different types of molecules. Only about 20% of the air we breathe is oxygen. When we compare the air we exhale to the air in the room, is there more or less oxygen in the air we exhale? Where did the oxygen in the air go?

7. In the first activity, we exercised and took some measurements about the changes in our bodies. One of the things we measured was carbon dioxide output. How did we measure the carbon dioxide output? What were the results of our measurements? So, would the air that you exhale have more or less carbon dioxide than air in the room? Why?

8. In addition to the increased carbon dioxide output, what were some of the other changes we experienced in our bodies as we exercised? How does increased breathing rate and increased heart rate support the claim that your body needs more energy to do more vigorous exercise?

9. Does your body always need energy? YES! Even when you are asleep your body needs energy. (breathing, heartbeat, etc…) Where does your body get the energy it needs to do things? We get the energy to do things from food.

10. What two things does a substance have to do in order to meet the scientific definition of food? Provide ENERGY and BUILDING MATERIALS What are the three food molecules? PROTEINS, CARBOHYDRATES, and FATS.

11. We modeled the “burning” of food molecules in our cells when we really burned a tortilla chip outside.

12. Let’s discuss what happened in the “open system” and the “closed system”. FIRST: What were the two reactants? Why did the fire go out in the open system? *The chip burned up! The chip was the “limiting reactant.” Why did the chip go out in the closed system? *The oxygen ran out! The oxygen was the “limiting reactant.”

13. What are the two products do you get from burning? WATER and CARBON DIOXIDE! Water and carbon dioxide are also produced during cellular respiration. How did we test for carbon dioxide coming from our body? How did we test for water after burning the tortilla chip?

14. EXPERIMENTAL DESIGN! Please refer back to activity 2.1…. We evaluated several scenarios for flaws in experimental design. The students in those scenarios forgot….. SAMPLE SIZE! CONTROL GROUP! CHANGE ONLY ONE VARIABLE AT A TIME! CREATE A GOOD SCIENTIFIC QUESTION! (feasible, ethical, not opinion) KEEP GOOD RECORDS! RECORD LOGICAL DATA!

15. Some terms that you have learned along the way…. CONTROL GROUP: group exposed to the usual, normal, or typical environment. For comparison! EXPERIMENTAL GROUP: group exposed to the condition that is going to be different! INDEPENDENT VARIABLE: anything you change in an experiment DEPENDENT VARIABLE: OUTCOMES you measure in an experiment