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Questions and Answers
What is produced when lead nitrate is heated?
What is produced when lead nitrate is heated?
- Silver chloride and oxygen
- Calcium carbonate and water
- Barium iodide and potassium nitrate
- Lead oxide and nitrogen dioxide (correct)
What causes silver chloride to turn grey upon sunlight exposure?
What causes silver chloride to turn grey upon sunlight exposure?
- Reaction with potassium bromide
- Decomposition of calcium hydroxide
- Photodecomposition of silver chloride (correct)
- Formation of lead iodide
What type of reaction is represented by the formation of barium sulfate as a white precipitate?
What type of reaction is represented by the formation of barium sulfate as a white precipitate?
- Decomposition reaction
- Redox reaction
- Combination reaction
- Precipitation reaction (correct)
Which compound is formed when potassium iodide reacts with lead nitrate?
Which compound is formed when potassium iodide reacts with lead nitrate?
What is the result of the electrolysis of water?
What is the result of the electrolysis of water?
What happens when an aqueous solution of sodium sulphate and barium chloride are mixed?
What happens when an aqueous solution of sodium sulphate and barium chloride are mixed?
What is the color of ferrous sulphate crystals?
What is the color of ferrous sulphate crystals?
What sound is produced when water is added to solid quick lime?
What sound is produced when water is added to solid quick lime?
What observation is made when an iron nail is placed in a copper sulphate solution?
What observation is made when an iron nail is placed in a copper sulphate solution?
What is the result of adding potassium iodide solution to lead nitrate?
What is the result of adding potassium iodide solution to lead nitrate?
Which type of energy is required for decomposition reactions?
Which type of energy is required for decomposition reactions?
What happens to silver chloride when exposed to sunlight?
What happens to silver chloride when exposed to sunlight?
What is produced when zinc reacts with silver nitrate?
What is produced when zinc reacts with silver nitrate?
What is the mole ratio of hydrogen and oxygen gases liberated during the electrolysis of water?
What is the mole ratio of hydrogen and oxygen gases liberated during the electrolysis of water?
Which statements are correct regarding the reaction 3Fe(s) + 4H2O (g) → Fe2O3(s) + 4H2(g)?
Which statements are correct regarding the reaction 3Fe(s) + 4H2O (g) → Fe2O3(s) + 4H2(g)?
What gas is used to pack potato chips to prevent spoilage?
What gas is used to pack potato chips to prevent spoilage?
Which statement correctly describes the process of respiration?
Which statement correctly describes the process of respiration?
What is an example of a double displacement reaction?
What is an example of a double displacement reaction?
Identify the reducing agent in the reaction 3 MnO2 + 4Al → 3 Mn + 2 Al2O3.
Identify the reducing agent in the reaction 3 MnO2 + 4Al → 3 Mn + 2 Al2O3.
What type of gas is evolved when lead nitrate crystals are heated?
What type of gas is evolved when lead nitrate crystals are heated?
Identify the type of reaction for ZnCO3(s) → ZnO(s) + CO2(g).
Identify the type of reaction for ZnCO3(s) → ZnO(s) + CO2(g).
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Study Notes
Chemical Reactions
- Decomposition: A chemical reaction where one reactant breaks down to form multiple products.
- Example: 2Pb(NO3)2 → 2PbO + 4NO2(g) + O2 (lead nitrate decomposes to lead oxide, nitrogen dioxide, and oxygen)
- Double Displacement: A chemical reaction where two reactants exchange ions to form two new products.
- Example: 2KI + Pb(NO3)2 → PbI2 + 2KNO3
- Example: 2KBr + BaI2 → 2KI + BaBr2
- Combination Reaction: A reaction where two or more reactants combine to form a single product.
- Example: H2(g) + Cl2(g) → 2HCl (hydrogen gas and chlorine gas combine to form hydrochloric acid)
- Displacement Reaction: A reaction where one element replaces another in a compound.
- Example: Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s) (iron replaces copper in copper sulfate)
- Redox Reaction: A reaction involving the transfer of electrons.
- Oxidation: Loss of electrons and increase in oxidation number.
- Reduction: Gain of electrons and decrease in oxidation number.
- Example: 3MnO2 + 4Al → 3Mn + 2Al2O3
- Aluminum (Al) is the reducing agent, it reduces manganese oxide (MnO2) and gets oxidized.
- Manganese oxide (MnO2) is the oxidizing agent, it oxidizes aluminum (Al) and gets reduced.
Chemical Properties & Reactions
- Silver Chloride: Turns gray when exposed to sunlight due to decomposition into silver and chlorine.
- Chemical Equation: 2AgCl → 2Ag + Cl2
- Lead Nitrate: When heated, it decomposes into lead oxide, nitrogen dioxide (brown gas), and oxygen gas.
- Chemical Equation: 2Pb(NO3)2 → 2PbO + 4NO2 (g) + O2
- Quicklime (Calcium Oxide): Reacts vigorously with water, releasing heat and forming calcium hydroxide.
- Chemical Equation: CaO + H2O → Ca(OH)2
- Iron Nail in Copper Sulfate Solution: Iron displaces copper in the solution, forming iron sulfate and depositing copper on the nail.
- Chemical Equation: Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
- Calcium Carbonate: Decomposes when heated into calcium oxide and carbon dioxide gas.
- Chemical Equation: CaCO3(s) → CaO(s) + CO2(g)
Silver Chloride Properties
- Silver chloride (AgCl) is a white, insoluble compound (precipitate) that turns grey when exposed to light.
- Stored in dark-colored bottles to prevent decomposition.
Iron Properties
- Iron displaces copper from copper sulfate solution (Fe is more reactive than Cu).
- Chemical Equation: Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s)
Respiration
- A chemical reaction that releases energy by breaking down glucose with oxygen.
- Exothermic Reaction: Releases heat and light energy
Miscellaneous
- Potato chips: Packed in nitrogen gas (N2) to prevent spoilage and oxidation.
- Barium sulfate: A white precipitate formed in a precipitation reaction.
- Ferrous sulfate (FeSO4) A bluish-green colored crystal.
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