Photochemical Smog (2025)

What is photochemical smog?

• A type of fog that forms over oceans

• A brown haze formed when sunlight reacts with air pollutants

• A type of cloud that forms in cold weather

• A clear sky phenomenon during sunrise

Tags

NGSS.HS-ESS3-4

NGSS.HS-ESS3-1

What are the major primary pollutants from automobiles that contribute to smog?

• CO2 and SO2

• NO and VOCs

• O2 and N2

• H2O and CO

Tags

NGSS.HS-LS2-7

Why are Volatile Organic Compounds (VOCs) named 'volatile'?

• Because they are solid at room temperature

• Because they can vaporize at room temperature

• Because they are liquid at high temperatures

• Because they are stable at room temperature

What are the primary pollutants emitted by cars, factories, and power plants that contribute to photochemical smog?

• Nitrogen oxides (NOx) and VOCs

• Carbon dioxide and water vapor

• Sulfur dioxide and methane

• Ammonia and ozone

What triggers the chemical reactions that form secondary pollutants in photochemical smog?

• Sunlight and heat

• Rain and wind

• Snow and ice

• Darkness and cold

Tags

NGSS.HS-PS1-5

Which secondary pollutants are formed as a result of photochemical smog?

• Ozone (O3) and PANs

• Carbon monoxide and sulfuric acid

• Methane and ammonia

• Nitrogen and oxygen

Which pollutants are classified as secondary pollutants in the diagram?

• NO and NO₂

• VOCs and CO

• O₃ and PANs

• SO₂ and H₂S

What are the reactants in the chemical reaction shown in the image?

• NO, VOC, and sunlight

• Ozone and PANs

• Water and carbon dioxide

• Hydrogen and oxygen

What are the products formed in the chemical reaction shown in the image?

• Ozone and PANs

• NO and VOC

• Water and carbon dioxide

• Hydrogen and oxygen

What does PANs stand for in the chemical reaction?

• Peroxyacyl nitrates

• Polyatomic nitrates

• Peroxide nitrates

• Phosphoric acids