Can You Take The Challenge On This Chemistry Quiz

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Can You Take The Challenge On This Chemistry Quiz - Quiz

In chemistry, equations help us to know about what is happening in a chemical reaction. The starting materials are known as the reactants (sometimes called reagents), and the new materials are called the products. Scientists use balanced symbol equations to describe chemical reactions. Can you rightly balance these equations? Take this quiz to find out.


Questions and Answers
  • 1. 

    Choose the correctly balanced chemical equation from the list.

    • A.

      CH4 + 2O2 → CO2 + H2O

    • B.

      CH4 + 3O2 → CO2 + 2 H2O

    • C.

      CH4 + 2O2 → CO2 + 2 H2O

    • D.

      CH4 + 2O2 → CO2 + 3 H2O

    Correct Answer
    C. CH4 + 2O2 → CO2 + 2 H2O
    Explanation
    The balanced chemical equation shows that one molecule of methane (CH4) reacts with two molecules of oxygen (O2) to produce one molecule of carbon dioxide (CO2) and two molecules of water (H2O). This is the correct equation because it follows the law of conservation of mass, where the number of atoms on both sides of the equation is the same.

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  • 2. 

    Choose the correctly balanced chemical equation from the list.

    • A.

      Al + 6HCl → 2AlCl3 + 3H2

    • B.

      2Al + 6HCl → 2AlCl3 + 3H2

    • C.

      Al + HCl → AlCl3 + H2

    • D.

      2Al + HCl → AlCl3 + 3H2

    Correct Answer
    B. 2Al + 6HCl → 2AlCl3 + 3H2
    Explanation
    The balanced chemical equation must have the same number of atoms of each element on both sides of the equation. In this case, the equation 2Al + 6HCl -> 2AlCl3 + 3H2 satisfies this requirement. It shows that 2 atoms of Aluminum (Al) react with 6 molecules of Hydrochloric acid (HCl) to produce 2 molecules of Aluminum chloride (AlCl3) and 3 molecules of Hydrogen gas (H2). This equation is balanced because it has an equal number of Al, H, and Cl atoms on both sides.

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  • 3. 

    Choose the correctly balanced chemical equation from the list.

    • A.

      C2H6 + 31/2O2 → 2CO2 + 3H2O

    • B.

      C2H6 + 7O2 → 4CO2 + 5H2O

    • C.

      C2H6 + 3O2 → 2CO2 + 3H2O

    • D.

      C2H6 + 31/2O2 → CO2 + 3H2O

    Correct Answer
    A. C2H6 + 31/2O2 → 2CO2 + 3H2O
    Explanation
    The correct answer is C2H6 + 31/2O2 → 2CO2 + 3H2O. This equation is balanced because the number of atoms of each element is the same on both sides of the equation. There are 2 carbon atoms, 6 hydrogen atoms, and 7 oxygen atoms on both sides of the equation. The coefficients in front of each molecule indicate the number of molecules involved in the reaction, and they are chosen to ensure that the equation is balanced.

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  • 4. 

    Choose the correctly balanced chemical equation from the list.

    • A.

      2NaBr + Cl2 → 2NaCl + Br2

    • B.

      NaBr + Cl2 → NaCl + Br2

    • C.

      2NaBr + Cl2 → NaCl + Br2

    • D.

      3NaBr + Cl2 → 3NaCl + Br2

    Correct Answer
    A. 2NaBr + Cl2 → 2NaCl + Br2
    Explanation
    The given chemical equation is balanced because the number of atoms of each element is the same on both sides of the equation. There are 2 sodium (Na) atoms, 2 bromine (Br) atoms, 1 chlorine (Cl) atom, and 1 bromine (Br) atom on both sides of the equation. This means that the equation follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.

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  • 5. 

    Choose the correctly balanced chemical equation from the list.

    • A.

      2H2 SO4 + Pb(OH)4 → Pb(SO4)2 + 4H2O

    • B.

      H2 SO4 + Pb(OH)4 → Pb(SO4)2 + 4H2O

    • C.

      2H2 SO4 + Pb(OH)4 → PbSO4 + 4H2O

    • D.

      2H2 SO4 + Pb(OH)4 → Pb(SO4)2 + H2O

    Correct Answer
    A. 2H2 SO4 + Pb(OH)4 → Pb(SO4)2 + 4H2O
    Explanation
    The given correct answer is the balanced chemical equation for the reaction between 2 moles of sulfuric acid (H2SO4) and 1 mole of lead(IV) hydroxide (Pb(OH)4). It produces 1 mole of lead(II) sulfate (Pb(SO4)2) and 4 moles of water (H2O). The coefficients in the equation represent the stoichiometric ratios between the reactants and products, ensuring that the number of atoms of each element is the same on both sides of the equation.

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  • 6. 

    Choose the correctly balanced chemical equation from the list.

    • A.

      Mg(OH)2 + 2HCl → MgCl2 + H2O

    • B.

      Mg(OH)2 + 2HCl → MgCl2 + 2H2O

    • C.

      Mg(OH)2 + HCl → MgCl2 + H2O

    • D.

      MgOH + 2HCl → MgCl2 + 2H2O

    Correct Answer
    B. Mg(OH)2 + 2HCl → MgCl2 + 2H2O
    Explanation
    The correct answer is Mg(OH)2 + 2HCl → MgCl2 + 2H2O. This equation is balanced because there are an equal number of atoms on both sides of the equation. The equation follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. In this equation, there are 2 magnesium atoms, 4 hydrogen atoms, 2 chlorine atoms, and 2 oxygen atoms on both sides of the equation. Therefore, this equation is correctly balanced.

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  • 7. 

    Choose the correctly balanced chemical equation from the list.

    • A.

      TiCl4 + H2O → TiO + 4HCl

    • B.

      TiCl4 + 3H2 → TiO2 + 5HCl

    • C.

      TiCl4 + H2 → TiO2 + HCl

    • D.

      TiCl4 +2H2O → TiO2 + 4HCl

    Correct Answer
    D. TiCl4 +2H2O → TiO2 + 4HCl
    Explanation
    The correct answer is TiCl4 + 2H2O → TiO2 + 4HCl. This is the balanced chemical equation because the number of atoms of each element is the same on both sides of the equation. There are 1 titanium (Ti) atom, 4 chlorine (Cl) atoms, 4 hydrogen (H) atoms, and 2 oxygen (O) atoms on both sides. The coefficients in front of each compound indicate the number of molecules or moles of that compound involved in the reaction, and they are balanced to ensure that the number of atoms is conserved.

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  • 8. 

    Choose the correctly balanced chemical equation from the list.

    • A.

      3Na3PO4 + 3HCl → 3NaCl + H3PO4

    • B.

      Na3PO4 + 2HCl → 3NaCl + H3PO4

    • C.

      Na3PO4 + HCl → NaCl + H3PO4

    • D.

      Na3PO4 + 3HCl → 3NaCl + H3PO4

    Correct Answer
    D. Na3PO4 + 3HCl → 3NaCl + H3PO4
    Explanation
    The given equation is balanced because the number of atoms of each element is the same on both sides of the equation. There are 3 sodium (Na) atoms, 1 phosphorus (P) atom, 12 oxygen (O) atoms, and 3 chlorine (Cl) atoms on both sides of the equation. The coefficients in front of each compound indicate the number of molecules or moles of that compound, and they are balanced as well. Therefore, this equation is correctly balanced.

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  • 9. 

    Choose the correctly balanced chemical equation from the list.

    • A.

      PCl5 + H2O → H3PO4 + HCl

    • B.

      PCl5 + 4H2O → H3PO4 + HCl

    • C.

      PCl5 + 4H2O → H3PO4 + 5HCl

    • D.

      PCl5 + 4H2O → H3PO4 + 5HC

    Correct Answer
    C. PCl5 + 4H2O → H3PO4 + 5HCl
    Explanation
    The balanced chemical equation is PCl5 + 4H2O → H3PO4 + 5HCl. This equation is balanced because the number of atoms of each element is the same on both sides of the equation. There are 1 phosphorus atom, 5 chlorine atoms, 8 hydrogen atoms, and 4 oxygen atoms on both sides of the equation, which indicates that the equation is balanced.

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  • 10. 

    Choose the correctly balanced chemical equation from the list.

    • A.

      FeO3 + 3CO → Fe + 3CO2

    • B.

      2FeO3 + 2CO → Fe + 3CO2

    • C.

      FeO3 + 3CO → Fe + 2CO2

    • D.

      FeO3+ 3CO → Fe + CO2

    Correct Answer
    A. FeO3 + 3CO → Fe + 3CO2
    Explanation
    The correct answer is FeO3 + 3CO → Fe + 3CO2. This equation is balanced because there are equal numbers of each type of atom on both sides of the equation. There is one Fe atom on both sides, three O atoms on both sides, and three C atoms on both sides. Additionally, there are two CO2 molecules on the right side to balance the equation.

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  • Current Version
  • Mar 18, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 27, 2019
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    Max
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