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Questions and Answers
The shiny finish of a wall after whitewash is because of?
The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is?
Which of the following statements about the given reaction are correct? 3Fe(s) + 4H2O(g) → Fe2O3(s) + 4H2(g)
In order to prevent the spoilage of potato chips, they are packed in plastic bags containing the gas?
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The process of respiration is?
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Give an example of a double displacement reaction.
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Name the reducing agent in the chemical reaction 3 MnO2 + 4Al → 3 Mn + 2Al2O3.
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Name the brown-colored gas evolved when lead nitrate crystals are heated in a dry test tube.
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Give reasons why silver chloride is stored in dark-colored bottles.
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Why does a copper vessel lose shine when exposed to air?
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Why does iron replace copper from copper sulfate solution?
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Identify the following reactions as combination, decomposition, displacement, or double displacement reactions:
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Study Notes
Chemical Reactions
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Decomposition Reaction
- Example: Heating lead nitrate (2Pb(NO3)2) produces lead oxide (2PbO), nitrogen dioxide (4NO2), and oxygen (O2).
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Precipitation Reaction
- Formation of barium sulfate (BaSO4) from barium chloride and sodium sulfate results in a white precipitate.
Light and Chemical Changes
- Silver chloride (AgCl) undergoes a photochemical change, turning grey upon exposure to sunlight.
Double Displacement Reactions
- Reaction of potassium iodide (2KI) with lead nitrate (Pb(NO3)2) yields lead iodide (PbI2), a yellow precipitate, and potassium nitrate (2KNO3).
- Reaction of potassium bromide (2KBr) with barium iodide (BaI2) results in the formation of potassium iodide (2KI) and barium bromide (BaBr2).
Quiz Questions and Answers
- Wall finish shiny due to calcium carbonate (c).
- Electrolysis of water produces hydrogen and oxygen in a 2:1 mole ratio (b).
- In the reaction involving iron and water, iron is oxidized, water is reduced, and acts as an oxidizing agent (c).
- Potato chips are packed in nitrogen gas (c) to prevent spoilage.
- Respiration is an exothermic oxidation reaction (d).
Examples of Chemical Reactions
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Double Displacement Examples
- Aqueous sodium sulfate reacts with barium chloride, forming a white precipitate (b).
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Color of Ferrous Sulfate
- Ferrous sulfate crystals are light green (b).
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Reactions Involving Quick Lime
- Mixing quick lime with water produces a hissing sound (c).
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Iron and Copper Sulfate Reaction
- Placing an iron nail in copper sulfate results in a light green solution and a brown deposit on the nail (c).
Classifications of Reactions
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Reactions Identified
- ZnCO3(s) decomposes into ZnO(s) + CO2(g) - Decomposition
- Pb(s) + CuCl2 → PbCl2(aq) + Cu(s) - Displacement
- H2(g) + Cl2(g) → 2HCl - Combination
- CaCO3(s) decomposes to CaO(s) + CO2(g) - Decomposition
- NaCl(g) + AgNO3(aq) → AgCl + NaNO3 - Double Displacement
- 3H2(g) + N2(g) → 2NH3(g) - Combination
- Fe2O3 + Al → Al2O3 + 2Fe - Displacement
Additional Notes
- Chemical reactions can be classified based on their characteristics and interactions, such as combination, decomposition, displacement, and double displacement.
- Understanding the behavior of substances under different conditions is crucial in predicting the outcomes of chemical reactions.
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Description
Test your knowledge on chemical reactions, focusing on the decomposition and formation of compounds like magnesium oxide and lead nitrate. This quiz will challenge your understanding of basic chemistry concepts and reaction equations.
