Which one is not like the others? 1/24/2014 Which one is not like the others? Your self starter is the paper in the basket.

Today’s Goal I CAN use physical and chemical changes to decide if a chemical reaction has taken place.

Today’s Schedule Review Warm-up Physical and Chemical Changes Notes Physical and Chemical Changes Practice Physical and Chemical Changes Pictures

PHYSICAL AND CHEMICAL CHANGES (one more time)

Characteristic that you can observe directly Physical PROPERTY Characteristic that you can observe directly Examples: Boiling Point Melting Point Brittleness Elasticity Density Transparency Ductility

Change when the identity of the substance is still the same Physical CHANGE Change when the identity of the substance is still the same

Chemical PROPERTY Characteristic that can only be observed when one substance changes into another substance Examples: Ability to rust Reactivity with vinegar Flammability

Chemical CHANGE Transforms one type of matter into another kind of matter, usually resulting in new properties

Chemical Properties Flammability - The ability to burn Ability to rust - Reacts with oxygen to produce rust Reactivity with vinegar - Reacts with acids to make something new (gases)

Physical Properties Transparency - The property of letting light pass through something Boiling point - The temperature when a substance changes from liquid to gas Melting point - The temperature when a substance changes from solid to liquid Brittleness - The property of breaking easily

Physical Properties Elasticity - The property of being stretched Density - How close together the particles are in something Ductility - The property of being reshaped

1 Glass Breaking 2 Hammering Wood 3 Rusting Bike 6 Bleaching Hair CHEMICAL PHYSICAL PHYSICAL 6 Bleaching Hair 4 Melting Butter 5 Separate Sand & Gravel PHYSICAL CHEMICAL PHYSICAL

7 Frying an egg 8 Squeeze oranges 9 Melting Ice 10 Mix salt and water CHEMICAL PHYSICAL PHYSICAL 10 Mix salt and water 12 Water evaporating 11 Mix oil and water PHYSICAL PHYSICAL PHYSICAL

13 Cutting grass 14 Burning Leaves 15 Fireworks exploding CHEMICAL PHYSICAL CHEMICAL 17 Crushing a can 16 Cutting hair 18 Boiling water PHYSICAL PHYSICAL PHYSICAL

Hydrogen Physical Properties: Chemical Properties: Colorless Flammable Gas at room temp Chemical Properties: Flammable Very reactive

Oxygen Physical Properties: Chemical Properties: Colorless gas Blue when liquid Gas at room temp Chemical Properties: Flammable Very reactive

Water (H2O) Physical Properties: Chemical Properties: Colorless when gas Clear liquid & solid Can be solid, liquid, or gas at normal temps Chemical Properties: Nonflammable Nonreactive

Sodium (Na) Physical Properties: Chemical Properties: Soft Silver Metal Chemical Properties: Reactive with water Tarnishes easily

Chlorine (Cl) Physical Properties: Chemical Properties: Green Occurs as gas Chemical Properties: Toxic Gas Very reactive

NaCl Physical Properties: Chemical Properties: Solid White Crystal lattice structure Dissolves in water Does not conduct electricity Chemical Properties: Nonflammable Mostly nonreactive