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📚Redox Reactions & Oxidation States: Instructions: Choose the best answer for each question. 1. Which of the following is a defining characteristic of ALL redox reactions? a) Formation of a precipitate b) Transfer of protons (H⁺ ions) c) Transfer of electrons d) Release of heat (exothermic reaction) Answer: c) Transfer of electrons 2. In the following reaction, which species is being oxidized?

     2 Ag⁺(aq) + Cu(s)  →  2 Ag(s) + Cu²⁺(aq) 
     

a) Ag⁺ b) Cu c) Ag d) Cu²⁺ Answer: b) Cu (Loses electrons, oxidation number increases) 3. What is the oxidation state of sulfur (S) in H₂SO₄? a) +2 b) +4 c) +6 d) -2 Answer: c) +6 4. Which of the following is NOT a possible oxidation state of chlorine (Cl)? a) -1 b) +1 c) +3 d) +6 Answer: d) +6 (Chlorine can have oxidation states from -1 to +7, but not +6) 5. In a balanced half-reaction, what is used to balance the charges? a) H₂O b) H⁺ ions c) Electrons (e⁻) d) All of the above Answer: c) Electrons (e⁻) 6. A reducing agent is a species that: a) Loses electrons and is reduced. b) Gains electrons and is reduced. c) Loses electrons and is oxidized. d) Gains electrons and is oxidized. Answer: c) Loses electrons and is oxidized. 7. In the compound Na₂O₂, what is the oxidation state of oxygen (O)? a) -2 b) -1 c) 0 d) +1 Answer: b) -1 (This is a peroxide) 8. Disproportionation is a type of redox reaction in which: a) The same element is both oxidized and reduced. b) Two different elements are oxidized. c) No electrons are transferred. d) The reaction is always endothermic. Answer: a) The same element is both oxidized and reduced. 9. What is the oxidation state of manganese (Mn) in the permanganate ion (MnO₄⁻)? a) +2 b) +4 c) +7 d) -1 Answer: c) +7 10. Which of the following statements is TRUE about oxidation states? a) They always represent the actual charges on atoms in a compound. b) They are used to keep track of electron transfer in chemical reactions. c) They are always positive whole numbers. d) They are not applicable to covalent compounds. Answer: b) They are used to keep track of electron transfer in chemical reactions.

Don't always use "Very" Share ➕ 💻 Oxford English ✅️

Other ways to say - It's cold 🥶 ✔️ It's freezing! ✔️ It's so chilly out here. ✔️ I can see my breath, it's that cold. ✔️ I'm shivering, it's freezing. ✔️ It's bone-chillingly cold. ✔️ I can't feel my fingers, it's so cold. ✔️ The cold is biting today. ✔️ It's frosty. ✔️ It's teeth-chattering cold. ✔️ It's numbingly cold. Share ➕ ❤️English Academy✅

Other ways to say🔺I miss you ✔️ I long for you. ✔️ I wish you were here. ✔️ I yearn for your presence. ✔️ My heart aches for you. ✔️ My heart longs for you. ✔️ Your absence leaves a hole in my heart. ✔️I'm pining for you. ✔️I crave your presence. Share ➕ 💻 Oxford English ✅️

Linking Words Share ➕ 💻 Oxford English ✅️

🤔 Different ways to say - BIG      🦕 Large 🐳 Huge 🐪 Giant 🦒 Hefty 🦧 Gigantic 🦍 Sizeable 🐋 Colossal 🦏 Massive 🦛 Immense 🐳 Enormous 🐙 Monstrous 🐘 Humongous 🦕 Tremendous 🦖 Considerable Share ➕ 💻 Oxford English ✅️

Other ways to say ➡️ I'm sick ✔️ I'm under the weather. ✔️ I'm not feeling well. ✔️ I'm feeling off. ✔️ I'm not at my best. ✔️ I'm aching all over. ✔️ I'm feelig poorly. ✔️ I'm not feeling myself today. ✔️ I'm not in good shape. Share ➕ 💻 Oxford English ✅️

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