2. Physical & Chemical Changes at the particulate level

3. E. Mylar Balloon Physical or Chemical Change?

4. A.Fog in a Bottle dust particle water molecule Physical or Chemical Change? H 2 O (g) H 2 O (l)

5. B. Dropper Bottles KI Pb(NO 3 ) 2 2 KI (aq) + Pb(NO 3 ) 2 (aq)   2 KNO 3 (aq) + PbI 2 (s) Physical or Chemical Change?

6. C. Iodine I 2 (s) I 2 (g) I 2 (s) Physical or Chemical Change? deposit

7. D. Alka-Seltzer Physical or Chemical Change? water molecule NaHCO 3 CO 2 fizzing = effervescence

8. F. Talking with SF 6 N 2 = 2 x ~14 amu = 28 amu O 2 = 2 x ~16 amu = 32 amu SF 6 = 32 amu+[6 x ~19 amu] = ~146 amu He= ~4 amu He N2N2 O2O2 SF 6 air Particles with less mass vibrate faster across the vocal cords. Particles with more mass vibrate more slowly across the vocal cords. Physical or Chemical Change?