QUESTION: Which of the following is not an element?
A Graphite
B Germanium
C Silica
D Silicon
ANSWER: Silica
|
Element |
Compound | ||
| Name of element | Uses | Name of compound | Uses |
| Hydrogen
(H)
|
· Hydrogen fuel cells
· Chemical synthesis |
Silica
(SiO2) |
· Glass manufacturing
· Abrasives · Electronics |
| Oxygen
(O)
|
· Respiration
· Combustion · Metal production |
Water (H2O) |
· Drinking
· Hydration · Industrial processes |
| Carbon
(C)
|
· Organic compounds
· Fuel · Building materials |
Carbon Dioxide
(CO2) |
· Photosynthesis carbonation
· Fire extinguishing |
| Silicon
(Si)
|
· Electronics
· Semiconductors · Glass · Ceramics |
Sodium Chloride
(Nacl) |
· Seasoning
· Food preservation · Industrial processes |
| Iron
(Fe)
|
· Construction
· Machinery · Steel production |
Ethanol
(C2H5OH) |
· Alcohol for beverages
· Fuel · Solvent |
| Copper
(Cu)
|
· Electrical wiring
· Plumbing · Electronics |
Methane
(CH4) |
· Natural gas
· Fuel · Carbon source |
| Germanium
(Ge) |
· Semiconductors
· Optics · Infrared devices |
Hydrogen Peroxide
(H2O2) |
· Bleaching
· Disinfection · Rocket propellant |
| Graphite
(C) |
· Lubricants
· Pencils · Electrodes |
Ammonia
(NH3) |
· Fertilizers
· Cleaning products · Refrigeration |