Chemical Clash: Displacements, Redox & Rancidity 🎯🔬
Think you know how elements swap, rust, or make your chips taste bad? Are you ready to test your chemistry instincts?
Quiz Questions:
Question 1: Which of the following best describes a single displacement reaction? 🔁⚗️
- A more reactive element replaces a less reactive element in a compound
- Two compounds exchange ions to make two new compounds
- Formation of an insoluble solid when two solutions are mixed
- Simultaneous gain and loss of electrons
Question 2: Which equation shows a double displacement reaction? 🔀🧪
- Na2SO4 + BaCl2 → BaSO4 + 2NaCl
- Zn + CuSO4 → ZnSO4 + Cu
- 2H2 + O2 → 2H2O
- CuO + H2 → Cu + H2O
Question 3: Which of these statements correctly defines a precipitation reaction? 💧➕🧊
- A double displacement reaction that produces an insoluble solid
- A reaction where a metal displaces another metal
- Any reaction where gases form
- A reaction where oxidation numbers change significantly
Question 4: In the reaction CuO + H2 → Cu + H2O, which species is oxidised and which is reduced? 🔴🔵
- H2 is oxidised; CuO is reduced
- CuO is oxidised; H2 is reduced
- Both are oxidised
- Both are reduced
Question 5: Which of these is NOT a preventive measure against corrosion? 🛡️🔧
- Painting the metal
- Oiling or greasing
- Storing food in airtight containers
- Galvanisation (coating with zinc)
Question 6: Why does galvanisation protect iron from rusting? 🛡️⚙️
- Zinc is less reactive and blocks oxygen physically
- Zinc is more reactive so it preferentially corrodes, protecting iron (sacrificial anode)
- It forms a rubbery layer that seals the iron
- Galvanisation adds oxygen to iron making it inert
Question 7: Which equation represents a precipitation reaction that yields a white solid? ⚪🧫
- AgNO3 + NaCl → AgCl(s) + NaNO3
- Zn + CuSO4 → ZnSO4 + Cu
- Fe + O2 + H2O → FeO(OH) (rust)
- NaOH + HCl → NaCl + H2O
Question 8: Rancidity of fats and oils can be slowed by all EXCEPT: 🥫❄️
- Refrigeration
- Adding antioxidants
- Painting the food container
- Flushing with nitrogen gas
Question 9: Which of the following is a redox reaction? 🔥⚡
- 2Fe + O2 → 2FeO
- NaCl + AgNO3 → NaNO3 + AgCl
- NH4Cl → NH3 + HCl
- BaCl2 + Na2SO4 → BaSO4 + 2NaCl
Question 10: Which mnemonic helps remember oxidation and reduction in terms of oxygen and hydrogen? 🔍🧠
- Oxidation = gain of oxygen; Reduction = loss of oxygen (and opposite for hydrogen)
- Oxidation = gain of hydrogen; Reduction = gain of oxygen
- Oxidation and reduction are the same process
- Oxidation = gain of electrons; Reduction = loss of electrons only
Chemical Clash: Displacements, Redox & Rancidity 🎯🔬
Think you know how elements swap, rust, or make your chips taste bad? Are you ready to test your chemistry instincts?
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Question 1
Which of the following best describes a single displacement reaction? 🔁⚗️
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