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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

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Gle 1

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

Hydrogen + Oxygen

H(2): Hydrogen (gas) burns, reacts explosively with oxygen, chlorine and fluorine

O: Oxygen (gas) very reactive, needed for fire


Water

Water

H2O-water

liquid (typically)

puts out fire


Sodium chlorine

Sodium + Chlorine

Na: Sodium (solid, metal) Reacts violently w/water

Cl: Chlorine (gas) Poisonous


Table salt

Table Salt

NaCl – table salt

safe to eat

dissolves in water

solid


Carbon oxygen

Carbon + oxygen

C: Carbon (solid) charcoal/diamonds

O: Oxygen (gas) very reactive, needed for fire


Carbon dioxide

Carbon Dioxide

CO2-carbon dioxide

what animals exhale

what plants take in


Carbon hydrogen oxygen

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

Glucose (Sugar)

C6H12O6-glucose (sugar)

dissolves in water

solid

edible


Nitrogen hydrogen

Nitrogen + Hydrogen

N: Nitrogen (gas) not reactive as an element

H (3): Hydrogen (gas) burns, reacts explosively with oxygen, chlorine and fluorine


Ammonia

Ammonia

NH3-ammonia

gas

pungent odor

dissolves in water (household cleaner)

used in fertilizers, plastics and explosives


Sodium hydrogen carbon oxygen

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

Baking Soda

NaHCO3-Baking Soda (sodium bicarbonate)

cleaning (clothes, teeth, etc.)

cooking

deodorizing

puts out grease and electric fires


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