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Bellringer 11-7-2013 What are the 2 most basic categories of matter? 2. If you shine a flashlight through a glass of KoolAid and then a glass of water with a little milk mixed in, which one(s) would you see the light beam going through the glass? a. Kool-Aid b. Milky water c. Both 1. What is Matter? It has mass and takes up space Everything around us is matter ON A PIECE OF NOTEBOOK PAPER, MAKE THE FOLLOWING GRAPHIC ORGANIZER Physical Properties Chemical Properties Physical Changes Chemical Changes Physical Properties Definition: can be observed without altering the chemical composition of a substance Examples: color, texture, malleability, solubility, mass, volume, density Malleable: capable of being extended or shaped by beating Play Dough: Physical Properties Color? Texture? Malleability? Mass? Solubility? Physical Properties Physical properties can be described as being intensive or extensive. Extensive Properties: • Dependent on size. • volume, mass, and length Intensive Properties: • do not change with the sample size • can be useful in identifying a substance color, density, viscosity, temperature, solubility, and states of matter. Chemical Properties Definition: the ability of a substance to combine with or change with other substances. Toxicity, reactivity, flammability, radioactivity Play Dough: Chemical Properties Toxicity Reactivity Flammability Radioactivity #1 The boiling point of a certain alcohol is 75 degrees Celsius Physical #2 Copper forms green copper carbonate when in contact with moist air Chemical #3 Table salt dissolves in water Physical #4 Copper is a good conductor of heat and electricity Physical #5 Magnesium burns brightly when ignited Chemical #6 Iron is more dense than aluminum Physical What’s the Difference? Matter can change Examples: Freeze, cut, burn, etc. 2 types of changes 1. 2. Physical changes Chemical changes Physical Changes Definition: when the state or form of matter is changed physically or mechanically Clue: still the same stuff Examples: breaking, cutting, freezing, melting, etc. Ask yourself…”Can it be turned back into how it started?” Yes Chemical Change Definition: takes place on a molecular level (reaction) and produces a new chemical substance. Clue: new stuff, color etc. A chemical change always involves a chemical reaction Where is the Evidence??? Evidence of chemical change: color change, gas production, and release of heat, light, odor, or sound. Examples: Burning (combustion), rusting, tarnishing and fermenting ice melting burning a chemistry book melting iron frying an egg fireworks exploding in the sky turning wood into a baseball bat baking a cake sharpening a pencil sulfuric acid added to sugar http://www.youtube.com/watch?v=nqDHwd9 rG0s carving a watermelon into a creepy looking face pouring liquid nitrogen into a bowl and watching it vaporize Exit Ticket: A chemist is looking to describe a chemical with a intensive property. Which of the following is an intensive property? Mass is 6.7g b. Boiling point is 500 C c. Volume is 4 cm3 Label as physical or chemical: Ice melting Baking a cake Iron rusting a.