Elements

•__________make up elements•Elements are the simplest

__________ substances (ex. Hydrogen, Helium, Oxygen); can’t be broken down by chemical means–92 naturally occurring; Earth’s crust is mostly Oxygen and Silicon

Compounds

•Compounds are pure substances that are formed when _____________ ________________________

•Ex. Water – made up of 2 atoms of Hydrogen and 1 atom of Oxygen; all water molecules have the same properties

• Combo of two or more substances; are _________ but not ___________ combined

• May be separated by physical means- evaporation, filtration, magnets, picking out pieces, etc.

• Exist in any phase- liquids (ethanol & gas); liquid/gas (Coke®); solids (taco salad); gas/solid (smoke)

What’s a Mixture??

Heterogeneous mixture

-________________ throughout; “least mixed”

-_____________ particles

-easier to separate

-examples: salad dressing, your sock drawer, cereal, sand, rocks, soil

Homogeneous Mixture

• “__________________”• Examples include: glass, iced

tea, stainless steel, smoke, toothpaste

A Type of Homogeneous Mixture…

•Solutions- “best mixed;” made of a substance that is dissolved (________) and a substance that does the dissolving (_________)– In other words: the solvent dissolves the solute

Examples: lemonade, coffee, soda, ocean water, dental filling

Did You Know….

….that not all solutions are liquids?

•___________- metal solutions that are solids dissolved in solids (ex. Gold jewelry is gold and copper dissolved together)