Chemical Reactions and Equations Quiz
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Questions and Answers

What type of reaction is represented by the equation BaCl2 (aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl(aq)?

  • Displacement
  • Combination
  • Redox
  • Precipitation (correct)

Which of the following represents an endothermic reaction?

  • 2CH3OH(l) + 3O2(g) → 2CO2(g)+4H2O(l)
  • C(s) + O2(g) → CO2(g)
  • N2(g) + O2(g) → 2NO(g) (correct)
  • 2H2(g) + O2(g) → 2H2O(l)

What are the correct coefficients a, b, and c in the equation aP4 + bCl2 → cPCl5?

  • 1, 10, 4 (correct)
  • 1, 10, 8
  • 1, 10, 2
  • 1, 5, 4

Why is silver chloride stored in dark bottles?

<p>To prevent it from decomposing in sunlight. (B)</p> Signup and view all the answers

In the reaction Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s), what role does zinc play?

<p>Zinc is getting oxidized. (B)</p> Signup and view all the answers

Which statement correctly describes a neutralization reaction?

<p>It produces salts and water. (C)</p> Signup and view all the answers

In the reaction 2PbO(s) + C(s) → 2Pb(s) + CO2(g), which of the following statements is correct?

<p>Lead oxide is getting reduced. (A)</p> Signup and view all the answers

What happens in a redox reaction?

<p>The reductant loses electrons. (D)</p> Signup and view all the answers

Which substance is oxidized in the equation MnO2 + 4HCl → MnCl2 + 2H2O + Cl2?

<p>MnO2 (D)</p> Signup and view all the answers

What type of reaction is represented by the equation 3BaCl2 + Al2(SO4)3 → 3BaSO4 + 2AlCl3?

<p>Double displacement reaction (C)</p> Signup and view all the answers

What causes silver jewellery to turn black when exposed to air?

<p>Formation of Ag2S (C)</p> Signup and view all the answers

What happens when quick lime is added to water?

<p>Hydration reaction takes place (A)</p> Signup and view all the answers

What is the balanced chemical equation for the reaction NaOH + _______ → Na2SO4 + H2O?

<p>H2SO4 (A)</p> Signup and view all the answers

What is the expected observation when a piece of silver is added to copper sulfate solution?

<p>No reaction occurs (C)</p> Signup and view all the answers

Which type of reaction would be characterized by a gas evolution and potential color change?

<p>Double displacement reaction (D)</p> Signup and view all the answers

In the reaction where a shining metal M burns and produces a white powder N, which characteristic reaction type is it?

<p>Combustion reaction (D)</p> Signup and view all the answers

What is the result of the reaction Zn + CuSO4?

<p>Both B and C are correct. (D)</p> Signup and view all the answers

Which reaction is described as a combination reaction?

<p>2Cu + O2 → 2CuO (D)</p> Signup and view all the answers

Why does no reaction occur when Ag is placed in CuSO4 solution?

<p>Silver is less reactive than copper. (A)</p> Signup and view all the answers

What characterizes a displacement reaction?

<p>A more reactive element displaces a less reactive element. (C)</p> Signup and view all the answers

In the reaction 2Al + 6HCl → 2AlCl3 + 3H2, what is produced?

<p>Aluminium chloride and hydrogen gas. (B)</p> Signup and view all the answers

Which of the following reactions represents a double displacement reaction?

<p>HCl + NaOH → NaCl + H2O (D)</p> Signup and view all the answers

What is formed when Ca(OH)2 reacts with CO2?

<p>Calcium carbonate and water. (D)</p> Signup and view all the answers

What is the product formed when zinc metal reacts with copper sulfate solution?

<p>Zinc sulfate (A)</p> Signup and view all the answers

What happens to element 'X' when heated in the air if it becomes black?

<p>It reacts to form a black oxide. (B)</p> Signup and view all the answers

What is indicated by the fading blue color of the CuSO4 solution?

<p>Formation of ZnSO4. (C)</p> Signup and view all the answers

In the reaction 3MnO2 + 4Al → 3Mn + 2Al2O3, what is the reducing agent?

<p>Aluminum (Al) (B)</p> Signup and view all the answers

During the reaction 2Cu + O2 → 2CuO, which statement is correct?

<p>Copper oxide is produced. (A)</p> Signup and view all the answers

In the reaction CaCO3 → CaO + CO2, which observation indicates that a gas is being evolved?

<p>Bubbles forming. (A)</p> Signup and view all the answers

Which statement describes a characteristic of double displacement reactions?

<p>They involve the exchange of ions between two compounds. (A)</p> Signup and view all the answers

What is the main difference between displacement and double displacement reactions?

<p>Displacement reactions have one element that displaces another, while double displacement involves an ion exchange. (B)</p> Signup and view all the answers

Which of the following elements is likely to be more reactive based on the given reactions?

<p>Aluminum (Al) (C)</p> Signup and view all the answers

Flashcards

Barium chloride and Sodium Sulphate Reaction Type

A double displacement reaction where barium sulphate precipitates out of the solution.

Endothermic Reaction

A chemical reaction that absorbs heat from its surroundings.

Balancing Chemical Equation - P4 + Cl2 → PCl5

The balanced equation for the reaction between phosphorus and chlorine to produce phosphorus pentachloride is P4 + 10Cl2 → 4PCl5.

Silver Chloride Storage

Silver chloride is stored in dark bottles to prevent its decomposition by light.

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Neutralization Reaction

A reaction between an acid and a base that produces a salt and water.

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Redox Reaction - 2PbO + C → 2Pb + CO2

Lead oxide (PbO) is reduced, and carbon (C) is oxidized in the reaction.

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Redox Reaction - Zn and CuSO4

Zinc loses electrons (is oxidized) and copper ions gain electrons (are reduced) in the reaction.

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Oxidizing Agent Examples

An oxidizing agent gains electrons, getting reduced in the process. A reducing agent loses electrons, getting oxidized.

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Displacement Reaction

A chemical reaction where a more reactive element takes the place of a less reactive element in a compound.

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Double Displacement Reaction

A reaction where two compounds swap their ions to form two new compounds.

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Zinc and Copper Sulphate Reaction

Zinc metal reacts with copper sulphate solution to form zinc sulphate and copper metal.

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Aluminium and Hydrochloric Acid Reaction

Aluminium metal reacts with dilute hydrochloric acid to produce aluminium chloride and hydrogen gas.

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Black Compound Formation

When a shiny brown element 'X' is heated in air, it turns black because it forms an oxide.

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Reducing Agent

A substance that causes another substance to gain electrons (be reduced).

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More Reactive Element

An element that loses electrons more easily and is more likely to displace another element from a compound.

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Observations of a Reaction

What you can see or measure during a chemical reaction, such as color changes, gas production, or temperature changes.

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Oxidation in a Reaction

The process of losing electrons in a chemical reaction. The substance that loses electrons is said to be oxidized.

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Identify the Oxidized Substance

In a chemical reaction, identify the substance that loses electrons (undergoes oxidation). Look for changes in oxidation states.

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Silver Tarnishing

Silver jewellery turns black due to a reaction with sulfur in the air, forming silver sulfide (Ag2S).

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What is a Precipitate?

A solid that forms from a solution during a chemical reaction. Precipitates usually settle at the bottom of the container.

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Gas Evolution Reaction

A type of chemical reaction where gas bubbles are released. This usually occurs when a gas is formed as a product.

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Complete & Balance Chemical Reaction

Represent a reaction using chemical formulas. The number of atoms of each element must be the same on both sides of the equation (balanced).

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Oxidation or Reduction?

Determine if a substance gains or loses electrons during a reaction. Gaining electrons is reduction, losing electrons is oxidation.

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Aluminium and Hydrochloric Acid

Aluminium reacts with hydrochloric acid to release hydrogen gas and form aluminium chloride.

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Combination Reaction

A reaction where two or more reactants combine to form a single product.

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Oxidation

The process of losing electrons and gaining oxygen.

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Color Change Observation

The change in color of a substance during a reaction indicates a chemical change has occurred.

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Gas Evolution Observation

The release of gas bubbles during a reaction indicates a chemical change has occurred.

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Study Notes

Chemical Reactions and Equations

  • 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.

  • Endothermic Reactions:

    • Absorb energy from the surroundings, often appearing cold.
    • Example: N₂(g) + O₂(g) → 2NO(g)

  • Stoichiometry:

    • Finding the numerical relationship between elements in a reaction, using balanced equations.

  • 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.

  • Neutralization Reactions:

    • Reaction between an acid and a base that produces salt and water.
    • Example: NaOH + HCl → NaCl + H₂O

  • Storing Silver Chloride (AgCl):

    • Stored in dark bottles to prevent its decomposition in sunlight.

  • Silver Jewellery Blackening:

    • Prolonged exposure to air causes formation of silver sulfide (Ag₂S), darkening the jewelry.

  • 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

  • Reaction Color Changes:

    • Precipitate color (e.g. CuS, black) forms during a reaction.

  • 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.

  • 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.

  • Element Burning in Air:

    • Copper (brown) becomes copper oxide (black) when heated in air.

  • 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.

  • Balancing Chemical Equations:

    • Example: NaOH + H₂SO₄ → Na₂SO₄ + H₂O. Balance reactants and products.

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Chemical Reactions And Equations Practice Sheet Warrior 2025 PDF

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.

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