CSCA CHEM PREP
CSCA Chemistry Practice Exam (48 Questions with Answers & Explanations) CSCA Chemistry Hard Mode Practice Each question includes the correct answer and explanation to help you revise effectively. Questions with Answers & Explanations 1. What is the molar mass of H₂SO₄? A) 96 B) 98 C) 100 D) 102 Answer: B (98) H=1×2, S=32, O=16×4 → 2+32+64 = 98 g/mol. 2. Which particle has no charge? A) Proton B) Electron C) Neutron D) Ion Answer: C Neutrons are neutral; protons are +, electrons are -. 3. The pH of a strong acid is: A) 7 B) >7 C) Answer: C Strong acids have very low pH values below 7. 4. Which gas relights a glowing splint? A) H₂ B) O₂ C) CO₂ D) N₂ Answer: B Oxygen supports combustion, so it relights a glowing splint. 5. Avogadro’s number is: A) 6.02×10²³ B) 3.01×10²³ C) 9.81 D) 1.66×10⁻²⁷ Answer: A It represents number of particles in 1 mole. 6. Which bond involves sharing electrons? A) Ionic B) Covalent C) Metallic D) Hydrogen Answer: B ...