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Questions and Answers
What type of reaction is represented by the equation BaCl2 (aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq)?
What type of reaction is represented by the equation BaCl2 (aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq)?
Which of the following represents an endothermic reaction?
Which of the following represents an endothermic reaction?
What are the correct coefficients a, b, and c in the equation aP4 + bCl2 → cPCl5?
What are the correct coefficients a, b, and c in the equation aP4 + bCl2 → cPCl5?
Why is silver chloride stored in dark bottles?
Why is silver chloride stored in dark bottles?
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In the reaction Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s), what role does zinc play?
In the reaction Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s), what role does zinc play?
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Which statement correctly describes a neutralization reaction?
Which statement correctly describes a neutralization reaction?
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In the reaction 2PbO(s) + C(s) → 2Pb(s) + CO2(g), which of the following statements is correct?
In the reaction 2PbO(s) + C(s) → 2Pb(s) + CO2(g), which of the following statements is correct?
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What happens in a redox reaction?
What happens in a redox reaction?
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Which substance is oxidized in the equation MnO2 + 4HCl → MnCl2 + 2H2O + Cl2?
Which substance is oxidized in the equation MnO2 + 4HCl → MnCl2 + 2H2O + Cl2?
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What type of reaction is represented by the equation 3BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3?
What type of reaction is represented by the equation 3BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3?
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What causes silver jewellery to turn black when exposed to air?
What causes silver jewellery to turn black when exposed to air?
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What happens when quick lime is added to water?
What happens when quick lime is added to water?
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What is the balanced chemical equation for the reaction NaOH + _______ → Na2SO4 + H2O?
What is the balanced chemical equation for the reaction NaOH + _______ → Na2SO4 + H2O?
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What is the expected observation when a piece of silver is added to copper sulfate solution?
What is the expected observation when a piece of silver is added to copper sulfate solution?
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Which type of reaction would be characterized by a gas evolution and potential color change?
Which type of reaction would be characterized by a gas evolution and potential color change?
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In the reaction where a shining metal M burns and produces a white powder N, which characteristic reaction type is it?
In the reaction where a shining metal M burns and produces a white powder N, which characteristic reaction type is it?
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What is the result of the reaction Zn + CuSO4?
What is the result of the reaction Zn + CuSO4?
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Which reaction is described as a combination reaction?
Which reaction is described as a combination reaction?
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Why does no reaction occur when Ag is placed in CuSO4 solution?
Why does no reaction occur when Ag is placed in CuSO4 solution?
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What characterizes a displacement reaction?
What characterizes a displacement reaction?
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In the reaction 2Al + 6HCl → 2AlCl3 + 3H2, what is produced?
In the reaction 2Al + 6HCl → 2AlCl3 + 3H2, what is produced?
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Which of the following reactions represents a double displacement reaction?
Which of the following reactions represents a double displacement reaction?
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What is formed when Ca(OH)2 reacts with CO2?
What is formed when Ca(OH)2 reacts with CO2?
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What is the product formed when zinc metal reacts with copper sulfate solution?
What is the product formed when zinc metal reacts with copper sulfate solution?
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What happens to element 'X' when heated in the air if it becomes black?
What happens to element 'X' when heated in the air if it becomes black?
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What is indicated by the fading blue color of the CuSO4 solution?
What is indicated by the fading blue color of the CuSO4 solution?
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In the reaction 3MnO2 + 4Al → 3Mn + 2Al2O3, what is the reducing agent?
In the reaction 3MnO2 + 4Al → 3Mn + 2Al2O3, what is the reducing agent?
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During the reaction 2Cu + O2 → 2CuO, which statement is correct?
During the reaction 2Cu + O2 → 2CuO, which statement is correct?
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In the reaction CaCO3 → CaO + CO2, which observation indicates that a gas is being evolved?
In the reaction CaCO3 → CaO + CO2, which observation indicates that a gas is being evolved?
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Which statement describes a characteristic of double displacement reactions?
Which statement describes a characteristic of double displacement reactions?
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What is the main difference between displacement and double displacement reactions?
What is the main difference between displacement and double displacement reactions?
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Which of the following elements is likely to be more reactive based on the given reactions?
Which of the following elements is likely to be more reactive based on the given reactions?
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Study Notes
Chemical Reactions and Equations
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Reaction Types:
- Displacement: One element replaces another in a compound.
- Precipitation: Formation of a solid from solutions.
- Combination: Two or more elements or compounds combine to form a new compound.
- Double Displacement: Two ionic compounds exchange ions to form two new compounds.
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Endothermic Reactions:
- Absorb energy from the surroundings, often appearing cold.
- Example: N₂(g) + O₂(g) → 2NO(g)
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Stoichiometry:
- Finding the numerical relationship between elements in a reaction, using balanced equations.
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Oxidation-Reduction (Redox) Reactions:
- Oxidation: Loss of electrons.
- Reduction: Gain of electrons.
- Oxidizing agent: Substance that causes oxidation (and itself gets reduced).
- Reducing agent: Substance that causes reduction (and itself gets oxidized).
- Example: Zn(s) + CuSO₄(aq) → ZnSO₄(aq) + Cu(s) where Zn is oxidized and Cu²⁺ is reduced.
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Neutralization Reactions:
- Reaction between an acid and a base that produces salt and water.
- Example: NaOH + HCl → NaCl + H₂O
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Storing Silver Chloride (AgCl):
- Stored in dark bottles to prevent its decomposition in sunlight.
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Silver Jewellery Blackening:
- Prolonged exposure to air causes formation of silver sulfide (Ag₂S), darkening the jewelry.
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Identifying Oxidized/Reduced Substance:
- Identify the substance that lost electrons (oxidized).
- Identify the substance that gained electrons (reduced).
- Example: MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂ ; HCl is oxidized to Cl₂ .
More Questions & Reactions
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Reaction Color Changes:
- Precipitate color (e.g. CuS, black) forms during a reaction.
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Reactions of Metals:
- Zinc with copper sulfate: Zinc displaces copper forming zinc sulfate (and copper metal).
- Aluminum with hydrochloric acid: Aluminum reacts with acid to produce hydrogen gas and aluminum chloride.
- Silver with copper sulfate: Reaction does not happen, as silver is less reactive.
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Quick Lime (CaO) with Water:
- Chemical reaction: CaO(s) + H₂O(l) → Ca(OH)₂(s).
- Observations: Heat is released and solution becomes warm; often characterized as a hissing sound.
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Element Burning in Air:
- Copper (brown) becomes copper oxide (black) when heated in air.
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Oxidising/Reducing Agents:
- Identify the element that is causing another element to lose electrons ('oxidizing') or gain electrons ("reducing").
- If a metal replaces another metal in a compound it's a stronger reducing agent.
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Balancing Chemical Equations:
- Example: NaOH + H₂SO₄ → Na₂SO₄ + H₂O. Balance reactants and products.
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Description
Test your knowledge on various types of chemical reactions including displacement, precipitation, combination, and redox reactions. This quiz will also cover stoichiometry and the concept of endothermic reactions. Challenge yourself to understand the principles that govern these exciting chemical processes.
