Elements make up elements Elements are the simplest substances (ex. Hydrogen, Helium, Oxygen); can’t be broken down by chemical means.

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Presentation transcript:

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)