Steps Of Balancing Equations Quiz

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| By Ana Selby
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Ana Selby
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  • 1/9 Questions

    a ssa     A substance that undergoes a change in a chemical reaction is

    • A product
    • A chemical
    • A reactant
    • An enzyme
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About This Quiz

A simple way to learn: practicing!  By applying the Law of conservation of mass it is easy to have any chemical equation balanced!  A few rules and everything is possible!

Steps Of Balancing Equations Quiz - Quiz

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  • 2. 

    What happens in a chemical reaction?

    • Atoms are destroyed

    • Atoms are created

    • Atoms are rearranged

    • Atoms are heated or cooled

    Correct Answer
    A. Atoms are rearranged
    Explanation
    Remember the Law of Conservation of matter: Matter cannot be created nor destroyed, although it may be rearranged.

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  • 3. 

                   A chemical equation is balanced by changing or adding

    • Chemical symbols

    • Subscripts

    • Coefficients

    • Reactants

    Correct Answer
    A. Coefficients
    Explanation
    The coefficients (number in front of atoms or molecules)are the only item that can be changed when balancing chemical equations.

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  • 4. 

    What coefficients will satisfy the following equation Hg  +  O2  ---->  HgO                                      

    • 1,1,1

    • 2,2,1

    • 2,1,2

    • 1,2,2

    Correct Answer
    A. 2,1,2
    Explanation
    In the reactants side, I have 1 mercury atom and 2 Oxygen atoms, so I need to have the same in the products side, a number 2 in front of HgO will give 2 Oxygen, but also gives me 2 Hg, so now I need to add a 2 in front of my Hg in the reactant side to have 2,1,2

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  • 5. 

    What coefficients will satisfy the following equation AgNO3  +  NaCl  ---->  AgCl   +   NaNO3                       

    • 2,2,2,1

    • 1,1,1,1

    • 1,2,1,2

    • 2,1,2,1

    Correct Answer
    A. 1,1,1,1
    Explanation
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  • 6. 

                   A balanced chemical equation shows the proportions of reactants and products necessary for

    • The reaction to occur

    • Mass to be conserved.

    • Energy use to be minimized.

    • Electrolysis to occur.

    Correct Answer
    A. The reaction to occur
    Explanation
    When we balance an equation we know how much reactants we need for the reaction to occur. It the same as writing a recipe (one cup of rice needs two cups of water, try it!).

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  • 7. 

    What coefficients will satisfy the following equation Al  + O2  --> Al2O3

    • 1,3,2

    • 4,3,2

    • 2,2,2

    • 2,1,3

    Correct Answer
    A. 4,3,2
    Explanation
    To balance the equation Al + O2 -> Al2O3, we need to ensure that the number of atoms of each element is the same on both sides of the equation. In this case, we have 1 Al atom on the left side and 2 Al atoms on the right side, so we need to multiply the coefficient of Al by 2. Similarly, we have 2 O atoms on the left side and 3 O atoms on the right side, so we need to multiply the coefficient of O2 by 3. Therefore, the coefficients that satisfy the equation are 4, 3, 2.

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  • 8. 

    What coefficients will satisfy the following equation H2 + O2 --->  H2O

    • 2,2,1

    • 2,1,2

    • 4,1,2

    • 2,2,2

    Correct Answer
    A. 2,1,2
    Explanation
    The equation represents the reaction between hydrogen gas (H2) and oxygen gas (O2) to form water (H2O). The coefficients in front of each compound indicate the number of molecules involved in the reaction. In this case, the equation is balanced when there are 2 molecules of hydrogen gas, 1 molecule of oxygen gas, and 2 molecules of water. This ensures that the number of atoms on both sides of the equation is equal, satisfying the law of conservation of mass.

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  • 9. 

    If you start with 5 mol of O2 in the reaction 2Mg + O2 ----> 2MgO, how many moles of Mg will you need?

    • 4

    • 5

    • 8

    • 10

    Correct Answer
    A. 10
    Explanation
    Based on the balanced equation, one mol of Oxygen reacts with 2 mol of Magnesium, therefore if I multiply one mol five times I need to multiply the two moles of Mg five times too (2 X 5 = 10)

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 01, 2008
    Quiz Created by
    Ana Selby
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