• Walking Through Paper

• Ivory Soap

• “The Soap That Floats”

• Bromothymol Blue

• pH indicator

• CO2 + H2O make carbonic acid

• Carbon Snake

• exothermic reaction

• Physical Change - a change in a substance that does not change its identity

• change in size, shape, or phase (solid, liquid, gas)

• does not change what the substance is

• is often reversible

• examples: dissolving, crushing, cutting, melting, freezing, evaporating

• Chemical Change - a change in which one or more substances combine or break apart to form new substances

• changes the chemical makeup of the substance

• often accompanied by release of a gas, color change, odor, release of heat

• usually not reversible

• examples: burning, rusting, baking, digestion, photosynthesis

• Conservation of Mass - matter cannot be created or destroyed through chemical or physical changes

• In a chemical reaction, all atoms present at the start of a reaction are present at the end

• ex. Photosynthesis: 6CO2 + 6H2O → C6H12O6 + 6O2

• Solid

• has a definite shape and a definite volume

• particles are packed tightly together in a fixed position; can vibrate slightly

• crystalline solids have particles arranged in a regular, repeating pattern

• melt at a specific temperature

• examples: sugar, salt, snow, quartz

• amorphous solids have particles which are not arranged in a regular pattern

• when heated, become softer and softer

• examples: wax, rubber, glass, plastic, butter