test3 March 10, 2025March 8, 2025 by u930973931_answers Score: 0 Attempted: 0/5 1. . ___________ The smallest particle of an element that retains its chemical properties is called: (A) Molecule (B) Atom (C) Ion (D) Proton 2. . ___________ Which of the following is an example of a chemical change? (A) Melting of ice (B) Rusting of iron (C) Breaking of glass (D) Boiling of water 3. . ___________ The pH scale measures the: (A) Amount of solute in a solution (B) Concentration of hydrogen ions (C) Density of a substance (D) Temperature of a solution 4. . ___________ Which gas is most abundant in Earth’s atmosphere? (A) Oxygen (B) Carbon dioxide (C) Nitrogen (D) Hydrogen 5. . ___________ The chemical formula of sodium chloride is: (A) NaCl (B) KCl (C) NaOH (D) HCl