Which element has the atomic number 1? a) Hydrogen b) Helium c) Oxygen d) Carbon Answer: a) Hydrogen
What is the chemical symbol for gold? a) Go b) Ag c) Au d) Gd Answer: c) Au
What is the pH of a neutral solution? a) 7 b) 10 c) 0 d) 14 Answer: a) 7
Which gas makes up the majority of Earth’s atmosphere? a) Oxygen b) Nitrogen c) Carbon dioxide d) Hydrogen Answer: b) Nitrogen
What is the chemical formula for water? a) H2O b) CO2 c) O2 d) HCl Answer: a) H2O
Which of the following is a noble gas? a) Neon b) Sodium c) Chlorine d) Potassium Answer: a) Neon
Which subatomic particle carries a positive charge? a) Neutron b) Proton c) Electron d) Nucleon Answer: b) Proton
What is the chemical name for baking soda? a) Sodium carbonate b) Sodium chloride c) Sodium bicarbonate d) Sodium hydroxide Answer: c) Sodium bicarbonate
Which gas is responsible for the “greenhouse effect” in the Earth’s atmosphere? a) Oxygen b) Nitrogen c) Carbon dioxide d) Hydrogen Answer: c) Carbon dioxide
What is the chemical formula for methane? a) CH4 b) CO2 c) H2O d) NH3 Answer: a) CH4
Which of the following is a halogen? a) Sodium b) Chlorine c) Potassium d) Calcium Answer: b) Chlorine
The process of converting a solid directly to a gas is called what? a) Sublimation b) Condensation c) Evaporation d) Melting Answer: a) Sublimation
Which element is essential for all organic compounds? a) Hydrogen b) Oxygen c) Carbon d) Nitrogen Answer: c) Carbon
What is the chemical symbol for iron? a) Ir b) Fe c) Au d) Ag Answer: b) Fe
What is the chemical formula for table salt? a) NaCl b) KCl c) HCl d) MgCl2 Answer: a) NaCl
Which gas is commonly used in balloons to make them float? a) Oxygen b) Nitrogen c) Helium d) Hydrogen Answer: c) Helium
What is the process of a substance changing from a gas to a liquid called? a) Sublimation b) Evaporation c) Condensation d) Freezing Answer: c) Condensation
Which element is found in the highest abundance in the Earth’s crust? a) Silicon b) Aluminum c) Iron d) Oxygen Answer: d) Oxygen
What is the chemical formula for hydrogen peroxide? a) H2O2 b) CO2 c) NaCl d) CH4 Answer: a) H2O2
Which gas gives lemons their sour taste? a) Carbon dioxide b) Oxygen c) Sulfur dioxide d) Hydrogen Answer: c) Sulfur dioxide
What is the chemical formula for ammonia? a) NH4 b) NO3 c) NH3 d) N2H4 Answer: c) NH3
Which of the following is a noble gas? a) Argon b) Sodium c) Calcium d) Potassium Answer: a) Argon
The process of a liquid changing to a gas at the surface is called what? a) Evaporation b) Sublimation c) Condensation d) Freezing Answer: a) Evaporation
What is the chemical formula for methane? a) CH4 b) CO2 c) H2O d) NH3 Answer: a) CH4
Which of the following is a halogen? a) Fluorine b) Magnesium c) Sodium d) Potassium Answer: a) Fluorine
What is the chemical formula for sulfuric acid? a) HCl b) H2SO4 c) HNO3 d) H3PO4 Answer: b) H2SO4
Which gas is known as “laughing gas”? a) Carbon dioxide b) Nitrous oxide c) Oxygen d) Helium Answer: b) Nitrous oxide
What is the chemical formula for carbon dioxide? a) CO2 b) CO c) CH4 d) O2 Answer: a) CO2
What is the most abundant gas in the Earth’s atmosphere? a) Oxygen b) Nitrogen c) Carbon dioxide d) Hydrogen Answer: b) Nitrogen
Which gas is used in photosynthesis by plants? a) Carbon dioxide b) Oxygen c) Nitrogen d) Hydrogen Answer: a) Carbon dioxide
What is the chemical formula for nitric acid? a) HCl b) H2SO4 c) HNO3 d) H3PO4 Answer: c) HNO3
Which gas is responsible for the characteristic smell of rotten eggs? a) Hydrogen b) Oxygen c) Sulfur dioxide d) Carbon dioxide Answer: c) Sulfur dioxide
What is the chemical formula for acetic acid, which is found in vinegar? a) CH4 b) H2O2 c) H2SO4 d) CH3COOH Answer: d) CH3COOH
Which element is a main component of organic molecules such as DNA and proteins? a) Phosphorus b) Calcium c) Nitrogen d) Sodium Answer: c) Nitrogen
What is the chemical symbol for lead? a) Ld b) Li c) Pl d) Pb Answer: d) Pb
Which gas is used for the inflation of automobile airbags? a) Oxygen b) Nitrogen c) Helium d) Argon Answer: b) Nitrogen
What is the chemical formula for hydrochloric acid? a) HCl b) H2SO4 c) HNO3 d) H3PO4 Answer: a) HCl
Which gas is known as “sweet air” due to its pleasant odor? a) Oxygen b) Nitrogen c) Carbon dioxide d) Hydrogen Answer: d) Hydrogen
What is the chemical formula for sodium hydroxide? a) NaOH b) H2SO4 c) HCl d) NaCl Answer: a) NaOH
Which element is the primary component of natural gas? a) Hydrogen b) Helium c) Methane d) Carbon Answer: c) Methane
What is the chemical formula for potassium nitrate, a common component of fertilizers? a) K2NO3 b) HNO3 c) KNO2 d) KOH Answer: a) K2NO3
Which gas is used in fire extinguishers to displace oxygen and suppress fires? a) Carbon dioxide b) Oxygen c) Nitrogen d) Hydrogen Answer: a) Carbon dioxide
What is the chemical symbol for silver? a) Si b) Sr c) Ag d) Sn Answer: c) Ag
Which gas is released by plants during photosynthesis? a) Oxygen b) Carbon dioxide c) Nitrogen d) Methane Answer: a) Oxygen
What is the chemical formula for table sugar (sucrose)? a) C6H12O6 b) H2O c) NaCl d) C12H22O11 Answer: d) C12H22O11
Which element is added to drinking water to prevent tooth decay? a) Fluorine b) Iron c) Magnesium d) Sodium Answer: a) Fluorine
What is the chemical formula for hydrogen sulfide, a gas with a “rotten egg” smell? a) H2S b) CO2 c) CH4 d) SO2 Answer: a) H2S
Which gas is responsible for the acidity of rain in the form of acid rain? a) Oxygen b) Nitrogen c) Carbon dioxide d) Sulfur dioxide Answer: d) Sulfur dioxide
What is the chemical formula for hydrofluoric acid, a highly corrosive compound? a) HF b) HCl c) HNO3 d) H2SO4 Answer: a) HF
Which gas is used in scuba diving tanks to allow divers to breathe at depth? a) Nitrous oxide b) Oxygen c) Helium d) Carbon monoxide Answer: b) Oxygen