2. Oxygen aIs one of the essential elements necessary for life

3. Oxygen aIs one of the essential elements necessary for life bMakes up over half the earth’s crust by mass

4. Oxygen aIs one of the essential elements necessary for life bMakes up over half the earth’s crust by mass cOccurs in the hydrosphere, lithosphere, and atmosphere litho – with Si, Al, and others hydro – in water as H 2 Oto form the earth’s crust atmo – as O 2 we breath and Ozone O 3 to protect

5. Oxygen aIs one of the essential elements necessary for life bMakes up over half the earth’s crust by mass cOccurs in the hydrosphere, lithosphere, and atmosphere litho – with Si, Al, and others hydro – in water as H 2 Oto form the earth’s crust atmo – as O 2 we breath and Ozone O 3 to protect d2/3 of our body weight is Oxygen

6. Oxygen aIs one of the essential elements necessary for life bMakes up over half the earth’s crust by mass cOccurs in the hydrosphere, lithosphere, and atmosphere litho – with Si, Al, and others hydro – in water as H 2 Oto form the earth’s crust atmo – as O 2 we breath and Ozone O 3 to protect d2/3 of our body weight is Oxygen eCombined with the food we eat to produce energy

7. Oxygen aIs one of the essential elements necessary for life bMakes up over half the earth’s crust by mass cOccurs in the hydrosphere, lithosphere, and atmosphere litho – with Si, Al, and others hydro – in water as H 2 Oto form the earth’s crust atmo – as O 2 we breath and Ozone O 3 to protect d2/3 of our body weight is Oxygen eCombined with the food we eat to produce energy f20 billion Kg is produce annually in the United States

8. Oxygen aIs one of the essential elements necessary for life bMakes up over half the earth’s crust by mass cOccurs in the hydrosphere, lithosphere, and atmosphere litho – with Si, Al, and others hydro – in water as H 2 Oto form the earth’s crust atmo – as O 2 we breath and Ozone O 3 to protect d2/3 of our body weight is Oxygen eCombined with the food we eat to produce energy f20 billion Kg is produce annually in the United States gCauses rust an corrosion

9. Oxygen aIs one of the essential elements necessary for life bMakes up over half the earth’s crust by mass cOccurs in the hydrosphere, lithosphere, and atmosphere litho – with Si, Al, and others hydro – in water as H 2 Oto form the earth’s crust atmo – as O 2 we breath and Ozone O 3 to protect d2/3 of our body weight is Oxygen eCombined with the food we eat to produce energy f20 billion Kg is produce annually in the United States gCauses rust an corrosion hPrimary cause for the spoilage of food

10. Oxygen aIs one of the essential elements necessary for life bMakes up over half the earth’s crust by mass cOccurs in the hydrosphere, lithosphere, and atmosphere litho – with Si, Al, and others hydro – in water as H 2 Oto form the earth’s crust atmo – as O 2 we breath and Ozone O 3 to protect d2/3 of our body weight is Oxygen eCombined with the food we eat to produce energy f20 billion Kg is produce annually in the United States gCauses rust an corrosion hPrimary cause for the spoilage of food ICauses wood to decay

11. When Oxygen reacts with a metal, we form the metal oxide Ti + O 2  TiO 2 Ca + O 2  CaO 2 When we burn something, we siply add oxygen (oxidize It) C 3 H 8 + O 2  3CO 2 + 4H 2 O

12. HYDROGEN aBy weight, it is 0.9% of the earth crust

13. HYDROGEN aBy weight, it is 0.9% of the earth crust bBy #, it makes up 15 % of the earth crust

14. HYDROGEN aBy weight, it is 0.9% of the earth crust bBy #, it makes up 15 % of the earth crust cUsually found combined with water or hydrocarbons

15. HYDROGEN aBy weight, it is 0.9% of the earth crust bBy #, it makes up 15 % of the earth crust cUsually found combined with water or hydrocarbons dIt is colorless and odorless

16. HYDROGEN aBy weight, it is 0.9% of the earth crust bBy #, it makes up 15 % of the earth crust cUsually found combined with water or hydrocarbons dIt is colorless and odorless eIt is the lightest of all substances

17. HYDROGEN aBy weight, it is 0.9% of the earth crust bBy #, it makes up 15 % of the earth crust cUsually found combined with water or hydrocarbons dIt is colorless and odorless eIt is the lightest of all substances fThere is 200 million Kg produced in the US yearly

18. HYDROGEN aBy weight, it is 0.9% of the earth crust bBy #, it makes up 15 % of the earth crust cUsually found combined with water or hydrocarbons dIt is colorless and odorless eIt is the lightest of all substances fThere is 200 million Kg produced in the US yearly g2/3 of this amount is used to produce ammonia 2H 2 + O 2  H 2 O

19. HYDROGEN aBy weight, it is 0.9% of the earth crust bBy #, it makes up 15 % of the earth crust cUsually found combined with water or hydrocarbons dIt is colorless and odorless eIt is the lightest of all substances fThere is 200 million Kg produced in the US yearly g2/3 of this amount is used to produce ammonia hnot used in blimps anymore 2H 2 + O 2  H 2 O

20. Oxidation / Reduction Oxidation – The gain of oxygen atoms Reduction – The loss of oxygen atoms 2Mg + O2  2MgO RhO2  RhO + O2

21. Oxidation / Reduction Oxidation – The loss of hydrogen atoms Reduction – the gain of hydrogen atoms C2H6O  C2H4O + H2 FeO2 + H2  FeH2O2

22. Oxidation / Reduction Oxidation – the loss of electrons Reduction – the gain of electrons Ag  Ag2+ Cr2+  Cr Ca + Mg2+  Ca2+ + Mg

23. OIL RIG oxidation involves loss reduction involves gain

24. Any oxidation is accompanied by a reduction FeO + H2  Fe + H2O