JUST DO IT 3.19.12 Daily Riddle In Question Solid to liquid:   In Question Solid to liquid: Liquid to solid: Gas to liquid:

Cytoplasm Nucleus Membrane Splitting Oval Energy Blood Muscle plant 10. Membrane 11. chlorophyll

Today in your notebooks PT groups/famillies, PT brainpop PT notes Atomic trends Atomic trends notes Compounds and molecules, BP Bonding notes Atomic arrangements Arrangements notes Valence electrons ws Valence electrons notes Phys/chem change ws Physical and chemical change notes

Physical and chem. Changes 3.19.13 1) 2) 3) 1) PHYSICAL CHANGE: Concerned with energy and states of matter. The substance does not change but may change phase. Ex) melting, freezing, evaporating, crushing/cutting. 2) CHEMICAL CHANGE: The substance changes at the molecular level. A new substance is produced. Ex) Burning, rotting, chemical reactions. 3) A phase change is a physical change b/c -the substance doesn’t change at the atomic level -you can turn it back into what it was

a. a hot glass cracking when placed in cold water - physical b a. a hot glass cracking when placed in cold water - physical  b. melting copper metal - physical c. burning sugar - chemical  d. mixing sugar in water - physical  e. digesting food - chemical

a. perfume evaporating on your skin - b. butter melting - c a. perfume evaporating on your skin -   b. butter melting -   c. wood rotting -   d. crushing a can- e. autumn leaves changing color-

1. Which of the following would NOT be a physical change? freezing water to make ice cubes  b. melting gold to make jewelry  c. burning gasoline in a lawnmower d. boiling water for soup  e. tearing a piece of aluminum foil 2. Which of the following is NOT a physical change? a. grating cheese b. melting cheese c. fermenting of cheese d. mixing two cheeses in a bowl