Chemistry Chemical equations practice quiz

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Chemistry Chemical equations practice quiz
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2013-09-14 17:36:53
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Chemical equations quiz
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  1. A solid produced by a chemical reaction in
    solution that separates from the solution is called
    a) a precipitate

    b) a reactant

    c) a molecule

    d) the mass of the product

    a
  2. In writing an equation that produces hydrogen
    gas, the correct representation of hydrogen gas is
    a) H

    b) 2H

    c) H2

    d) OH

    c
  3. To balance a chemical equation, it may be
    necessary to adjust the
    a) coefficients

    b) subscripts

    c) formulas of the products

    d) number of products

    •  
    • a
  4. A chemical equation is balanced when the
    • a) coefficients of the reactants equal the coefficients of
    • the products

    • b) same number of each kind of atom appears in the reactants
    • and in the products

    c) products and reactants are the same chemicals

    • d) subscripts of the reactants equal the subscripts of the
    • products

    •  
    • b
  5. How would oxygen be represented in the chemical equation
    for the reaction of methane and oxygen gas to yield carbon dioxide and water?
    a) oxygen

    b) O

    c) O2

    d) O3

    e) 2O

    c
  6. Which of the following is the correct chemical equation
    for the formation of carbon dioxide from carbon and oxygen?
    a) 2C + 2O2 --> CO2

    b) C + O2 ---> CO2

    c) CO2 ---> C + O2

    d) 2C + O ---> CO2

    b
  7. In an equation, the symbol for a substance in a
    water solution is followed by
    a) (l).

    b) (g).

    c) (aq).

    d) (s).

    c
  8. When the equation Fe3O4 +
    Al --> Al2O3 + Fe is correctly balanced, what is the
    coefficient of Fe?
    a) 3

    b) 4

    c) 6

    d) 9

    d
  9. Which coefficients correctly balance the formula
    equation NH4NO2 --> N2 (g) + H2O
    ?
    a) 1,2,2

    b) 1,1,2

    c) 2,1,1

    d) 2,2,2

    b
  10. Which coefficients correctly balance the formula equation

    CaO + H2O ---> Ca(OH) 2?
    a) 2,1,2

    b) 1,2,3

    c) 1,2,1

    d) 1,1,1

    d
  11. The complete balanced equation for the reaction between zinc
    II hydroxide and acetic acid is
    a) ZnOH + CH3COOH ---> ZnCH3COO + H2O

    • b) Zn(OH)2 + CH3COOH ---> Zn + 2CO2
    • + 3H2O

    • c) Zn(OH)2 + 2CH3COOH ---> Zn(CH3COO)2
    • + 2H2O

    • d) Zn(OH)2 + 2CH3COOH  ---> Zn(CH3COO)2 + O2
    • + H2


    c
  12. Which equation is NOT balanced?
    a) 2H2 + O2 ---> 2H2O

    b) 4H2 + 2O2 ---> 4H2O

    c) 2Al + 3F2 -->2AlF3

    d) 2H2 + O2 ---> H2O


    d
  13. In what kind of reaction do two elements
    combine to form a new compound?
    a) decomposition reaction

    b) ionic reaction

    c) double-replacement reaction

    d) synthesis reaction

    d
  14. The equation AX ---> A + X is the general
    equation for a
    a) synthesis reaction

    b) decomposition reaction

    c) combustion reaction

    d) single-replacement reaction

    b
  15. In what kind of reaction does a pure element
    replace a similar element in a compound?
    a) single-replacement reaction

    b) double-replacement

    c) decomposition reaction

    d) ionic reaction

    a
  16. The equation AX + BY ---> AY + BX is the
    general equation for a(n)
    a) synthesis reaction

    b) decomposition reaction

    c) single-replacement reaction

    d) double-replacement reaction


    d
  17. (s) + 3H2 (g) --> 2AlH3
    (s) is what type of reaction?
    a) combustion reaction

    b) ionic reaction

    c) synthesis reaction

    d) double-replacement reaction


    c
  18. In what kind of reaction does a single compound
    produce two or more simpler substances?
    a) decomposition reaction

    b) synthesis reaction

    c) single-replacement reaction

    d) ionic reaction

    a
  19. F2 + 2NaI --> 2NaF + I2 is what
    type of reaction?
    a) double-replacement reaction

    b) decomposition reaction

    c) single-replacement reaction

    d) ionic reaction

    c
  20. In what kind of reaction do the ions of two compounds
    exchange places in aqueous solution to form two new compounds?
    a) synthesis reaction

    b) double-replacement reaction

    c) decomposition reaction

    d) combustion reaction

    b
  21. The reaction 2Mg(s) + O2 (g) ---->
    2MgO(s) is a
    a) synthesis reaction

    b) decomposition reaction

    c) single-replacement reaction

    d) double-replacement reaction

    a
  22. The reaction Mg (s) + 2HCl (aq) --> H2
    (g) + MgCl2 (aq) is a
    a) composition reaction

    b) decomposition reaction

    c) single-replacement reaction

    d) double-replacement reaction

    c
  23. The reaction 2HgO(s)---> 2Hg(l) + O2
    (g) is a(n)
    a) single-replacement reaction.

    b) synthesis reaction.

    c) ionic reaction.

    d) decomposition reaction.

    d
  24. The reaction Pb(NO3) 2 (aq) +
    2KI(aq)----> PbI2 (s) + 2KNO3 (aq) is a
    a) double-replacement reaction.

    b) synthesis reaction.

    c) decomposition reaction.

    d) combustion reaction.

    a
  25. The reaction 2KClO3 (s) --->
    2KCl(s) + 3O2 (g) is a(n)
    a) synthesis reaction.

    b) decomposition reaction.

    c) combustion reaction.

    d) ionic reaction.

    b
  26. The reaction Cl2 (g) + 2KBr(aq)
    ---> 2KCl(aq) + Br2 (l) is a(n)
    a) synthesis reaction.

    b) ionic reaction.

    c) single-replacement reaction.

    d) combustion reaction.

    c
  27. Iron II sulfide reacts with hydrochloric acid to
    form Iron II chloride and hydrogen sulfide. 
    Which  of the following is the
    correct chemical equation that shows this (don’t worry about balancing)?
    a) Fe2S + HCl à FeCl2 + H2S

    b) FeS2 + HCl à FeCl2 + H2S

    • c) FeS + HCl à
    • FeCl + H2S

    • d) FeS + HCl à
    • FeCl2 + H2S

    • e) FeS2 + H2SO4 à
    • FeCl2 + H2S


    d
  28. When a binary compound decomposes, what is produced?
    a) an oxide

    b) an acid

    c) a tertiary compound

    d) two elements


    d
  29. In the equation 2Al(s) + 3Fe(NO3)2
    (aq) ---> 3Fe(s) + 2Al(NO3)3 (aq), iron has been
    replaced by
    a) nitrate.

    b) water.

    c) aluminum.

    d) nitrogen.


    c
  30. When an  insoluble
    solid compound is produced in a double-replacement reaction, a
    a) gas bubbles off.

    b) precipitate is formed.

    c) combustion reaction takes place.

    d) halogen is produced


    b
  31. In a double-replacement reaction, hydrogen
    chloride and sodium hydroxide react to produce sodium chloride.  The other product is
    a) sodium hydride.

    b) potassium chloride.

    c) water.

    d) hydrogen gas.


    c
  32. When potassium reacts with water, one product
    formed is
    a) hydrogen gas.

    b) oxygen gas.

    c) potassium oxide.

    d) salt.


    a
  33. A precipitate forms in a double-replacement
    reaction when
    a) hydrogen gas reacts with a metal.

    b) positive ions combine with negative ions.

    c) water boils out of the solution.

    d) a gas escapes.


    b
  34. What is the balanced equation when aluminum
    reacts with copper(II) sulfate?
    a) Al + Cu2S ---> Al2S + Cu

    • b) 2Al +3CuSO4 ---> Al2 (SO4)3
    • + 3Cu

    c) Al + CuSO4 ---> AlSO4 + Cu

    • d) 2Al + Cu2SO4 ---> Al2SO4
    • + 2Cu


    b
  35. Which compound dissociates to produce the ions SO42-
    (aq) and NH4+ (aq)?
    a) NH4SO4 (s)

    b) (NH4)2SO4 (s)

    c) NH4 (SO4)2 (s)

    • d) (NH4)3 (SO4)2
    • (s)


    b
  36. Which compound dissociates to produce the ions
    Ca2+ (aq) and NO3- (aq)?
    a) CaNO3 (s)

    b) Ca2NO3

    c) Ca(NO3)2 (s)

    d) Ca2(NO3)3



    c
  37. Which of the following compounds is NOT soluble
    in water?
    a) FeCl3

    b) Cu(OH)2

    c) NaI

    d) Pb(NO3)2

    e) KC2H3O2


    b
  38. Which of the following compounds will dissolve in water?
    a) K3PO4

    b) Mg3(PO4)2

    c) CuS

    d) ZnCO3

    e) PbBr2


    d
  39. Which of the following pairs of solutions
    produce a precipitate when combined?
    a) Cu(NO3)2 and NaCl

    b) Fe(NO3)3 and MgCl2

    c) Cu(NO3)2 and K2CO3

    d) CaCl2 and NaNO3

    c
  40. Which of the following pairs of solutions produce a
    precipitate when combined?
    a) KOH and NH4Cl

    b) Fe(NO)3 and KCl

    c) Na2SO4 and KCl

    d) NH4Cl and AgNO3


    d
  41. When solutions of Pb(NO3)2 and Fe2(SO4)3
    are combined, what precipitate(s) forms?
    a) PbSO4

    b) Fe(NO3)3

    c) FeNO3

    d) Pb2(SO4)3

    e) none of the above


    a
  42. When solutions of NH4OH and K2SO4
    are combined, what precipitate(s) forms?
    a) (NH4)2SO4

    b) KOH

    c)  K2OH

    d) K(NH4)2

    e) none of the above


    e
  43. When the hydrocarbon C8H18
    is burned in oxygen gas, what is the coefficient for oxygen in  the balanced equation?
    a) 3

    b) 6

    c) 12

    d) 18

    e) 25

    e
  44. When Aluminum metal is placed in a solution of
    Nickel II Sulfate, pure nickel is produced along with what other compound?
    a) Al2O3

    b) Al2(SO4)3

    c) NiSO4

    d) AlSO4

    e) Al3(SO4)2


    b
  45. Which of the following is sodium phosphate?
    a) NaP

    b) Na3P

    c) NaPO4

    d) Na3PO4

    e) Na(PO4)3


    e

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