Properties of Matter

Make a T chart in your spiral Classify each of the following as physical or chemical Gas productionTarnishing SouringExpanding CoolingHeating DigestingRusting DentingSqueezing SawingLight production BurningDissolving StretchingRotting CuttingChange of temperature MeltingFreezing New substanceMixing DryingContracting

Physical Properties A characteristic of a substance that can be observed or measured without changing the substance Ex: shape, color, length, mass, volume, density, odor, texture, states of matter, melting and boiling point

Physical Changes Physical Changes do not change the composition. The substance may look different but the identity does not change Grinding Cutting Coloring Dissolving Changes in the state ***Can usually be changed back***

Chemical Properties Any characteristic that gives a substance the ability to undergo a change that results in a new substance Ex: Flammability, Ability to react with: oxygen, electricity, light, water, heat etc

Chemical Changes Chemical Changes are changes in the identity of a substance due to the chemical properties Bubbles Color change (why did it change color?) Production of Heat Production of Light Production of Smoke Formation of a new substance Cannot usually be changed back

Law of Conservation of Mass Matter cannot be created or destroyed In other words, the mass you end up with is always the same as what you start with Then where does the mass go sometimes? Ex: Wood for a campfire

Changes in Energy Endothermic – energy is added to the substance to make it change Ex: Ice Melting, Baking bread, Evaporation Exothermic – energy is released when it changes Ice freezing, candle burning, photosynthesis

Energy determines the state!