Predicting Reactions
Practice Problems

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Use appropriate ionic and molecular formulas to show the reactants and the products for the following, each of which occurs in aqueous solution except as indicated. Omit formulas for any ionic or molecular species that do not take part in the reaction. You need not balance. In all cases a reaction occurs.

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Reaction Choices by Year:

1985 1986 1987 1988 1989 1990
1991 1992 1993 1994 1995 1996
1997 1998

1985

(a) Sodium metal is added to water.

(b) Dilute sulfuric acid is added to a solution of lithium hydrogen carbonate.

(c) Ethanol and formic acid (methanoic acid) are mixed and warmed.

(d) Excess concentrated potassium hydroxide solution is added to a precipitate of zinc hydroxide.

(e) The gases boron trifluoride and ammonia are mixed.

(f) A solution of tin(II) chloride is added to a solution of iron(III) sulfate.

(g) Phosphorus(V) oxytrichloride is added to water.

(h) An acidified solution of sodium permanganate is added to a solution of sodium sulfite.


1986

(a) A piece of lithium metal is dropped into a container of nitrogen gas.

(b) Dilute hydrochloric acid is added to a solution of potassium sulfite.

(c) Solid sodium oxide is added to water.

(d) A solution of sodium sulfide is added to a solution of zinc nitrate.

(e) A solution of ammonia is added to a dilute solution of acetic acid.

(f) A piece of iron is added to a solution of iron(III) sulfate.

(g) Ethene (ethylene) gas is bubbled through a solution of bromine.

(h) Chlorine gas is bubbled into a solution of potassium iodide.


1987

(a) Solid calcium is added to warm water.

(b) Powdered magnesium oxide is added to a container of carbon dioxide gas.

(c) Gaseous hydrogen sulfide is bubbled through a solution of nickel(II) nitrate.

(d) Excess concentrated sodium hydroxide solution is added to solid aluminum hydroxide.

(e) Solid silver is added to a dilute nitric acid (6M) solution.

(f) Excess potassium hydroxide solution is added to a solution of potassium dihydrogen phosphate.

g) Hydrogen peroxide solution is added to a solution of iron(II) sulfate.

h) Propanol is burned completely in air.


1988

(a) A solution of potassium iodide is added to an acidified solution of potassium dichromate.

(b) A solution of sodium hydroxide is added to a solution of ammonium chloride.

(c) A strip of magnesium is added to a solution of silver nitrate.

(d) Solid potassium chlorate is heated in the presence of manganese dioxide as a catalyst.

(e) Dilute hydrochloric acid is added to a solution of potassium carbonate.

(f) Sulfur trioxide gas is added to excess water.

(g) Dilute sulfuric acid is added to a solution of barium chloride.

(h) A concentrated solution of ammonia is added to a solution of copper(II) chloride.


1989

(a) Solutions of zinc sulfate and sodium phosphate are mixed.

(b) Solutions of silver nitrate and lithium bromide are mixed.

(c) A stream of chlorine gas is passed through a solution of cold, dilute sodium hydroxide.

(d) Excess hydrochloric acid solution is added to a solution of potassium sulfite.

(e) A solution of tin(II) chloride is added to an acidified solution of potassium permanganate.

(f) A solution of ammonium thiocyanate is added to a solution of iron(III) chloride.

(g) Samples of boron trichloride gas and ammonia gas are mixed.

(h) Carbon disulfide vapor is burned in excess oxygen.


1990

(a) Solutions of sodium iodide and lead nitrate are mixed.

(b) A solution of ammonia is added to a solution of ferric chloride.

(c) A solution of hydrogen peroxide is heated.

(d) Solutions of silver nitrate and sodium chromate are mixed.

(e) Hydrogen sulfide gas is bubbled through a solution of potassium hydroxide.

(f) Solid dinitrogen pentoxide is added to water.

(g) A piece of solid bismuth is heated

(h) A strip of copper metal is added to a concentrated solution of sulfuric acid.


1991

(a) Solid aluminum oxide is added to a solution of sodium hydroxide.

(b) Solid calcium oxide is heated in the presence of sulfur trioxide gas.

(c) Equal volumes of 0.1-molar sulfuric acid and 0.1-molar potassium hydroxide are mixed.

(d) Calcium metal is heated strongly in nitrogen gas.

(e) Solid copper(II) sulfide is heated strongly in oxygen gas.

(f) A concentrated solution of hydrochloric acid is added to powdered manganese dioxide and gently heated.

(g) A concentrated solution of ammonia is added to a solution of zinc iodide.

(h) A solution of copper(II) sulfate is added to a solution of barium hydroxide.


1992

(a) An excess of sodium hydroxide solution is added to a solution of magnesium nitrate.

(b) Solid lithium hydride is added to water.

(c) Solutions of ammonia and hydrofluoric acid are mixed.

(d) A piece of aluminum metal is added to a solution of silver nitrate.

(e) A solution of potassium iodide is electrolyzed.

(f) Solid potassium oxide is added to water.

(g) An excess of nitric acid solution is added to a solution of tetraaminecopper(II) sulfate.

(h) Carbon dioxide gas is bubbled through water containing a suspension of calcium carbonate.


1993

(a) A strip of copper is immersed in dilute nitric acid.

(b) Potassium permanganate solution is added to an acidic solution of hydrogen peroxide.

(c) Concentrated hydrochloric acid is added to an acidic solution of hydrogen peroxide.

(d) Excess chlorine has is passed over hot iron filings.

(e) Water is added to a sample of solid magnesium nitride.

(f) Excess sulfur dioxide gas is bubbled through a dilute solution of potassium hydroxide.

(g) Excess concentrated ammonia solution is added to a suspension of silver chloride.

(h) Solutions of tri-potassium phosphate and zinc nitrate are mixed.


1994

(a) Excess sodium cyanide solution is added to a solution of silver nitrate.

(b) Solutions of manganese(II) sulfate and ammonium sulfide are mixed.

(c) Phosphorous(V) oxide powder is sprinkled over distilled water.

(d) Solid ammonium carbonate is heated.

(e) Carbon dioxide gas is bubbled through a concentrated solution of potassium hydroxide.

(f) A concentrated solution of hydrochloric acid is added to solid potassium permanganate.

(g) A small piece of sodium metal is added to distilled water.

(h) A solution of potassium dichromate is added to an acidified solution of iron(II) chloride.


1995

(a) Ethanol is burned in oxygen.

(b) Solid barium oxide is added to distilled water.

(c) Chlorine gas is bubbled into a cold, dilute solution of potassium hydroxide.

(d) A solution of iron(II) nitrate is exposed to air for an extended period of time.

(e) Excess concentrated sulfuric acid is added to solid calcium phosphate.

(f) Hydrogen sulfide gas is bubbled into a solution of mercury(II) chloride.

(g) Solid calcium hydride is added to distilled water.

(h) A bar of zinc metal is immersed in a solution of copper(II) sulfate.


1996

(a) Solid calcium carbonate is strongly heated.

(b) A piece of nickel metal is immersed in a solution of copper(II) sulfate.

(c) Equal volumes of equimolar solutions of disodium hydrogen phosphate and hydrochloric acid are mixed.

(d) Chlorine gas is bubbled into a solution of sodium bromide.

(e) Ammonia gas is bubbled into a solution of ethanoic (acetic) acid.

(f) Solid ammonium carbonate is added to a saturated solution of barium hydroxide.

(g) Drops of liquid dinitrogen trioxide are added to distilled water.

(h) Solutions of potassium permanganate and sodium oxalate are mixed.


1997

(a) Excess potassium hydroxide solution is added to a solution of aluminum nitrate.

(b) A solution of sodium bromide is added to an acidified solution of potassium bromate.

(c) Sulfur dioxide gas is bubbled into distilled water.

(d) Phosphine (phosphorus trihydride) gas is bubbled into liquid boron trichloride.

(e) Hydrogen gas is passed over hot iron(II) oxide powder.

(f) Solid potassium amide is added to distilled water.

(g) A strip of magnesium metal is heated strongly in pure nitrogen gas.

(h) A solution of nickel chloride is added to a solution of sodium sulfide.


1998

(a) Solutions of tin(II) chloride and iron(III) chloride are mixed.

(b) Solutions of cobalt(II) nitrate and sodium hydroxide are mixed.

(c) Ethene gas is burned in air.

(d) Equal volumes of equimolar solutions of phosphoric acid and potassium hydroxide are mixed.

(e) Solid calcium sulfite is heated in a vacuum.

(f) Excess hydrochloric acid is added to a solution of diamminesilver(I) nitrate.

(g) Solid sodium oxide is added to distilled water.

(h) A strip of zinc is added to a solution of 6.0-molar hydrobromic acid.


Some of these practice problems came from a great site called The Chem Team.
Go visit The Chem Team Site for many more practice problems, tutorials, and resources.