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GLE #1. Both elements and compounds are pure substances Compounds are made by chemically combining 2 or more elements (the only way to break down a compound is by another chemical change-they break into smaller compounds and elements) Smallest piece of an element is an atom
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GLE #1 • Both elements and compounds are pure substances • Compounds are made by chemically combining 2 or more elements (the only way to break down a compound is by another chemical change-they break into smaller compounds and elements) • Smallest piece of an element is an atom • Smallest piece of a compound is a molecule
Hydrogen + Oxygen H(2): Hydrogen (gas) burns, reacts explosively with oxygen, chlorine and fluorine O: Oxygen (gas) very reactive, needed for fire
Water H2O- water liquid (typically) puts out fire
Sodium + Chlorine Na: Sodium (solid, metal) Reacts violently w/water Cl: Chlorine (gas) Poisonous
Table Salt NaCl – table salt safe to eat dissolves in water solid
Carbon + oxygen C: Carbon (solid) charcoal/diamonds O: Oxygen (gas) very reactive, needed for fire
Carbon Dioxide CO2- carbon dioxide what animals exhale what plants take in
Carbon+Hydrogen+Oxygen C (6): Carbon (solid) charcoal/diamonds H (12): Hydrogen (gas) burns, reacts explosively with oxygen, chlorine and fluorine O (6): Oxygen (gas) very reactive, needed for fire
Glucose (Sugar) C6H12O6- glucose (sugar) dissolves in water solid edible
Nitrogen + Hydrogen N: Nitrogen (gas) not reactive as an element H (3): Hydrogen (gas) burns, reacts explosively with oxygen, chlorine and fluorine
Ammonia NH3- ammonia gas pungent odor dissolves in water (household cleaner) used in fertilizers, plastics and explosives
Sodium+Hydrogen+Carbon+Oxygen Na: Sodium (solid, metal) Reacts violently w/water H: Hydrogen (gas) burns, reacts explosively with oxygen, chlorine and fluorine C: Carbon (solid) charcoal/diamonds O (3): Oxygen (gas) very reactive, needed for fire
Baking Soda NaHCO3- Baking Soda (sodium bicarbonate) cleaning (clothes, teeth, etc.) cooking deodorizing puts out grease and electric fires