1. States of Matter Day 4

2. Curriculum Big Idea: Changes in matter are accompanied by changes in energy. Big Idea: Changes in matter are accompanied by changes in energy. Competency: Demonstrate how changes in matter are accompanied by changes in energy. Competency: Demonstrate how changes in matter are accompanied by changes in energy. PA Standard 3.2.C.A3: Describe the three normal states of matter in terms of energy, particle motion, and phase transitions.

3. Today’s Agenda Opener: How does the size of a substance affect if it is a solid, liquid, or gas at room temperature? Opener: How does the size of a substance affect if it is a solid, liquid, or gas at room temperature? Review the last investigation Review the last investigation Investigate Today: Discover the affect of molecular POLARITY on states of matter (see unit 1.5: Solid, Liquid, or Gas? Packet). Investigate Today: Discover the affect of molecular POLARITY on states of matter (see unit 1.5: Solid, Liquid, or Gas? Packet). 1. Build models of molecules assigned by your teacher. 3. Discover how a molecule’s SHAPE (POLARITY) affects its state of matter at room temperature. Use models, diagrams, and tables to see multiple representations of how polarity affects physical state. Read the Chem Talk Handout, and answer the “Chemistry to Go” Questions in small groups. Read the Chem Talk Handout, and answer the “Chemistry to Go” Questions in small groups. Closure: Discuss answers as a class. Closure: Discuss answers as a class. Take Home Assignment: Quiz tomorrow on states of matter. Answer the review questions on the following slides.

4. Which state’s particles are the smallest?

5. Which state’s particles have the lowest average kinetic energy?

6. Which state’s particles have the greatest average velocity?

7. Contrast kinetic energy and potential energy

8. Define Sublimation

9. Give an example of a substance that sublimes.

10. What is the normal boiling point of water?

11. How is the normal boiling point of water different than the temperature at which water boils?

12. How does pressure affect boiling point?

13. What is the normal melting point of water?

14. Draw the heating curve of water, labeling the following: Melting point Melting point Boiling point Boiling point Solid Solid Liquid Liquid Gas Gas

15. Label the places on the heating curve where the kinetic energy changes

16. Label the places on the heating curve where the potential energy changes.

17. Does temperature change during a change in state?

18. What is the change of state when a gas changes into a solid without going through the liquid phase.

19. When the outside of your glass of ice water becomes wet when you take the glass of water outside, where is the water on the outside of the glass coming from?

20. What change in state is taking place in the previous question?

21. Contrast a polar molecule with a nonpolar molecule

22. How does polarity affect state?

23. How does the size of particles affect state?

24. Is the state of a substance a physical property or a chemical property? Why?

25. Give an example of a polar molecule.

26. Give an example of a nonpolar molecule.

27. How does the temperature of a gas affect its volume?