Chemistry class at the 10th-grade level

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multiple-choice questions for a Chemistry class at the 10th-grade level:

  1. Which of the following is NOT a physical change? a. Melting of ice b. Dissolving sugar in water c. Burning of wood d. Boiling of water
  2. Which of the following is an example of a chemical change? a. Freezing of water b. Cutting a piece of paper c. Rusting of iron d. Mixing salt and water
  3. Which of the following elements is a metal? a. Carbon b. Nitrogen c. Sodium d. Fluorine
  4. What is the chemical symbol for gold? a. Au b. Ag c. Fe d. Cu
  5. Which of the following is a greenhouse gas? a. Oxygen (O2) b. Nitrogen (N2) c. Carbon dioxide (CO2) d. Helium (He)
  6. What is the pH value of a neutral solution? a. 0 b. 7 c. 14 d. None of the above
  7. Which of the following is an example of an exothermic reaction? a. Burning of a candle b. Photosynthesis in plants c. Melting of ice d. Boiling of water
  8. Which subatomic particle has a negative charge? a. Proton b. Neutron c. Electron d. None of the above
  9. Which of the following is the formula for methane? a. CH3OH b. H2SO4 c. CH4 d. CO2
  10. Which type of bond involves the transfer of electrons between atoms? a. Ionic bond b. Covalent bond c. Metallic bond d. Hydrogen bond

Answers:

  1. c. Burning of wood
  2. c. Rusting of iron
  3. c. Sodium
  4. a. Au
  5. c. Carbon dioxide (CO2)
  6. b. 7
  7. a. Burning of a candle
  8. c. Electron
  9. c. CH4
  10. a. Ionic bond