Q: Infectious diseases are caused by

OPTIONS:
- allergies
- vitamin deficiencies
- chemical spills
- microorganisms
A: microorganisms
Q: Air is made up of many gases. Which gas is found in the greatest amount?

OPTIONS:
- Nitrogen
- Oxygen
- Carbon dioxide
- Hydrogen
A: Nitrogen
Q: What is the process called when an acid and a base combine to produce water and salt?

OPTIONS:
- neutralization
- dilution
- titration
- physical reaction
A: neutralization
Q: Which energy conversion process occurs whenever coal is burned?

OPTIONS:
- mechanical to electrical
- mechanical to thermal
- chemical to electrical
- chemical to thermal
A:
chemical to thermal