Q: What is the world's most serious resource problem? Choices: - gas shortage - citrus blight - deforestation - water scarcity A:
water scarcity

Q: What describes how much matter is in a certain amount of space? Choices: - volume - mass - viscosity - density A:
density

Q: Q: Light is produced when charged particles do what, frequently in the form of oscillating? Choices: - decelerate - increase - offset - accelerate A:
A: accelerate

Question: Q: Why do electronegativities decrease from top to bottom? Choices: - smaller atomic size - larger atomic variation - larger electric pull - larger atomic size A:
Answer: larger atomic size

*Question*
Q: Photochemical smog consists mainly of what? Choices: - acid - oxygen - carbon - ozone A:
**Answer**
ozone

Q: Q: Chemical reactions either require or release what? Choices: - light - electricity - enzymes - energy A:
A: energy