Chapter 7 Test: Chemical Equations

6 Questions | Total Attempts: 2072

SettingsSettingsSettings
Please wait...
Chapter 7 Test: Chemical Equations

You are going to take a quiz on chemical equations. Answer the following questions by selecting the correct choice.


Questions and Answers
  • 1. 
    The products and the reactants in the reaction have the same ___.
    • A. 

      Atoms

    • B. 

      Molecules

    • C. 

      Subscripts

    • D. 

      Bond energies

  • 2. 
    A balanced equation represents the law of mass conservation, and as a result all of the following are true except ___.
    • A. 

      The number of moles of products equals the number of moles of reactants

    • B. 

      The total mass of the product equals the total mass of the reactants

    • C. 

      The number of atoms in the products equals the number of atoms in the reactants

    • D. 

      The states of matter of the products are independent of the states of reactants

  • 3. 
    • A. 

      The same mass as the reactants

    • B. 

      Less total bond energy than the reactants

    • C. 

      More total bond energy than the reactants

    • D. 

      The same chemical properties as the reactants

  • 4. 
    The chemical reaction is exothermic if ___.
    • A. 

      ∆H is a negative value

    • B. 

      ∆H is a positive value

    • C. 

      Energy is absorbed during the reaction

    • D. 

      Energy is conserved during reaction

  • 5. 
    The only single-displacement reaction among the following chemical equations is ___.
    • A. 

      2H2O2(l) → 2H2O(l) + O2(g)

    • B. 

      Pb(s) + Hg2SO4(s) → PbSO4(s) + 2Hg(l)

    • C. 

      2NH3(g) → N2(g) + 3H2(g)

    • D. 

      NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO→3(aq)

  • 6. 
    C(s) + O2(g) → CO2(g)+ energy is a chemical reaction because ____.
    • A. 

      It releases energy

    • B. 

      The chemical properties of CO2 are different from the individual properties of carbon and oxygen

    • C. 

      It absorbs energy

    • D. 

      CO2 is a gas and carbon is a crystal