Chemistry

2. Compromises only about 0.05% of the earth's crust by mass but easily obtained
6. The use of pesticides and insecticides are types of ____ control to protect food crops from unwanted pests or insects
7. Two or more forms of the same element that differ in properties but exist in the same physical state
11. nitrogen ____ is the process of organisms to convert atmospheric nitrogen to a form that can be used by plants
12. The result of heating white phosphorous to about 300C in the absence of air
13. The antibacterial action of hydrogen peroxide is due to highly reactive molecules called
14. Makes up 78% of the volume of air
15. the most important commercial method of preparing hydrogen in the US
17. The most abundant element in the universe
18. The movement of nitrogen and nitrogen compounds from the air to the soil and back forms this cycle
19. A colorless gas with a characteristic pungent smell

1. Nitrogen is found in all living things in the form of ___ and nucleic acids
3. Ammonium ____ was commonly used as smelling salts to revive someone who has fainted
4. Addition of hydrogen to double (or triple) bonds
5. The ammonia used for fertilizer production is synthesized by the ____ process
6. A substance used to speed up a chemical reaction
8. Is a process in which plants replenish oxygen in Earth's atmosphere
9. Fool's gold
10. Most abundant element in earth's crust
16. The ____process is when superheated water injected into the bed of sulfur containing rock through the outermost of three concentric pipes causing sulfur to melt and form a liquid pool