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

2. Hydrogen + Oxygen
H(2): Hydrogen (gas) burns, reacts explosively with oxygen, chlorine and fluorine
O: Oxygen (gas) very reactive, needed for fire

3. Water
H2O- water liquid (typically) puts out fire

4. Sodium + Chlorine Na: Sodium (solid, metal) Reacts violently w/water
Na: Sodium (solid, metal) Reacts violently w/water
Cl: Chlorine (gas) Poisonous

5. Table Salt
NaCl – table salt safe to eat dissolves in water solid

6. Carbon + oxygen
C: Carbon (solid) charcoal/diamonds O: Oxygen (gas) very reactive, needed for fire

7. Carbon Dioxide CO2- carbon dioxide what animals exhale
what plants take in

8. 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

9. Glucose (Sugar)
C6H12O6- glucose (sugar) dissolves in water solid edible

10. Nitrogen + Hydrogen
N: Nitrogen (gas) not reactive as an element H (3): Hydrogen (gas) burns, reacts explosively with oxygen, chlorine and fluorine

11. Ammonia NH3- ammonia gas pungent odor
dissolves in water (household cleaner)
used in fertilizers, plastics and explosives

12. 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

13. Baking Soda NaHCO3- Baking Soda (sodium bicarbonate)
cleaning (clothes, teeth, etc.)
cooking
deodorizing
puts out grease and electric fires