Bellringer 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-Aidb. Milky waterc. Both

Matter 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 PropertiesChemical Properties Physical ChangesChemical 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. Physical changes 2. 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 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? a. Mass is 6.7g b. Boiling point is 500 C c. Volume is 4 cm 3 Label as physical or chemical: Ice melting Baking a cake Iron rusting