Reaction Set one combined for quiz on Fri Feb 26 Flashcards

Terms Definitions
a strip of zinc is placed in a solution of nickel(II) nitrate
Zn+Ni^2+--->Zn^2+ +Ni
Solid alumninum hydroxide is added to a concentrated soltion of potassium hydroxide
Al(OH)3 + OH- ---> Al(OH)4-
Ethyne(acetylene) is burned in air
C2H2 + O2 --> CO2+H2O
sodium carbonate with hydrochloric acid
Na2CO3 + 2 HCl => CO2 + H2O + 2NaCl
sulfuric acid is added to solid sodium sulfide
Na2S + 2H+ => H2S(g) + 2Na+
calcium hydrogen carbonate is added to an aqueous solution of acetic acid
Ca(HCO3)2(s) + 2H2C3O2(aq) => 2CO2(g) + 2H2O(l) + Ca2+(aq) + 2C2H3)2-(aq)
A strip of magnesium metal is added to a solution of silver(I) nitrate
Mg + 2Ag^+ ---> Mg^2+ + 2Ag
A solution of sodium hydroxide is added to a solution of lead(II) nitrate.
(i) Balanced equation: 2OH- + Pb2+ ---> Pb(OH)2 (s)
Excess nitric acid is added to solid calcium carbonate.
2H+ + CaCO3 ---> Ca2+ + H2CO3 (or CO2 + H2O)
A solution containing silver(I) ion (an oxidixing agent) is mixed with a; solution containing iron(II) ion (a reducing
agent).
Balanced equation: Ag+ + Fe2+ ---> Ag + Fe3+
Solid potassium chlorate is strongly heated.
KClO3 ---> KCl + O2
Calcium metal is added to a dilute solution of hydrochloric acid. (Give at least one visual observation for this reaction)
Ca + 2 H^+ --> Ca^2+ + H2 (vigorous bubbling as hydrogen gas is produced)
Liquid Bromine is added to a solution of potassium iodide. (Which substance is the oxidizing agent?)
Br2 + 2 I^- --> I2 + 2 Br^- (Bromine [Br2] is the oxidizing agent,accepting electrions from the iodide ions.)
Magnesium turnings are added to a solution of iron (III) chloride. (Describe a color change that corresponds to the reaction you write.)
3 Mg + 2 Fe^3+ --> 3 Mg^2+ + 2 Fe (or Fe^2+ : Mg + 2 Fe^3+ --> Mg^2+ + 2 Fe^2+ (The yellow/orange color of the mixture turns dirty looking, eventually light green (Fe^2+) and perhaps to colorless (Fe + Mg^2+))
A solution of potassium phosphate is mixed with a solution of calcium acetate.
PO4 3- + Ca 2+ ----> Ca3 (PO4)2
Solid zinc carbonated is added to 1.0 M sulfuric acid.
ZnCO3 + H+ -----> Zn2+ + CO2 + H2O
A solution of hydrogen peroxide is exposed to strong sunlight.
H2O2 ----> O2 + H2O
A 0.02 M hydrochloric acid solution is mixed with an equal volume of a .01 M calcium hydroxise solution.
OH- + H+ ----> H2O
Excess concentrated aqueous ammonia is added to solid silver chloride.
AgCl + NH3 -----> Ag(NH3)2 + Cl-
Magnesium ribbon is burned in oxygen.
Mg + O2 ----> MgO
A bar of strontium metal is immersed in a 1.0 M copper (II) nitrate solution.
Sr + Cu2+ ----> Sr2+ + Cu
Solid dinitrogen pentoxide is added to water.
N2O5 + H2O ----> H+ + NO3-
Solid potassium chlorate is strongly heated
KClO3 ->KCl + O2
Solid silver chloride is added to a solution of AgCl Solid silver chloride is added to a solution of concentrated hydrochloric acid
Ag + Cl- -> [AgCl2]-
A solution of ethanoic (acetic) acid is added to a solution of barium hydroxide
HC2H3O2 + OH- -> H2O + C2H3O2-
Ammonia gas is bubbled into a solution of hydrofluoric acid
NH3 + HF -> NH4+ + F-
Zinc metal is placed in a solution of copper(II) sulfate
Zn + Cu2+ ->Zn2+ +Cu
Hydrogen phosphide (phosphine) gas is added to boron trichloride gas
PH3 + BCl -> H3PBCl3 or PH3BCl3
A solution of nickel(II) bromide is added to a solution of potassuim hydroxide
Ni2+ + OH- -> Ni(OH)2
Hexane is combusted in air
C6H14 + O2 -> CO2 + H2O
Solid calcium carbonate is strongly heated
CaCO3 -> CaO + CO2
A strip of magnesium metal is placed in a solution of iron(II) chloride
Mg + Fe2+ ->Mg 2+ + Fe
Solid calcium carbonate is added to a solution of ethanoic (acetic) acid.
CaCO3 + HC2H3O2 --> Ca2+ +C2H3O2- +CO2 +H2O
Lithium metal is strongly heated in nitrogen gas
Li+ N2-->Li3N
Boron trifluoride gas is added to ammonia gas.
BF3 +NH3-->BF3NH3
Sulfur trioxide gas is bubbled into a solution of sodium hydroxide
SO3 + OH- --> SO4^2- +H2O
Equal volumes of .1 M solutions of lead(III) nitrate and magnesium iodide are combined
Pb^2+ +I- -->PbI2
Aqueous sodium hydroxide is added to a saturated solution of aluminum hydroxide, forming a complex ion.
Al(OH)3 + OH ---> [Al(OH)4]- or Al(OH)3 + 3OH- ---> [Al(OH)6]3- or Al3+ + 4OH- ---> [Al(OH)4]- or Al3+ + 6OH- ---> [Al(OH)6]3-
If the resulting mixture is acidified, would the concentration of the complex ion increase, decrease, or remain the same? Explain.
The [Al(OH4)]- will decrease because... (If equilibrium exists), the H+ added would react with the OH- in solution, reducing the [OH-] and shifting the equilibrium toward the reactants, thus reducing the concentration of the complex ion. OR (If the reaction has gone to completion), the H+ added would react with the [Al(OH)4]-, thus reducing the concentration. [Al(OH)4]- + H+ ---> Al(OH)3 + H2)
Hydrogen chloride gas is oxidized by oxygen gas.4HCl + O2 ---> 2H2O + 2Cl2 Other acceptable equations include
4HCl + 3O2 ---> 2H2O + 4ClO; 4HCl + 5O2 ---> 2H2O + 4ClO2; 4HCl + 7O2 ---> 2H2O + 4ClO3; 2HCl + O2 ---> 2HClO; HCl + O2 ---> HClO2; 2HCl + 3O2 ---> 2HClO3; HCl + 2O2 ---> HClO4
If three moles of hydrogen chloride gas and three moles of oxygen gas react as completely as possible, which, if any, is present in excess? Justify your answer.
O2 would be in excess because of the stoichiometry of the reaction; 4 moles of HCl are consumed for 1 mole o O2. (It takes only 0.75 mole O2 to react with 3 moles of HCl, leaving an excess of 2.25 moles of O2.) For other acceptable equations and products, the excess reactant must be based on the stoichiometry of the reaction given by the student.
Solid potassium oxide is added to water.
K2O + H2O ---> 2K+ + 2OH-
If a few drops of phenolphthalein are added to the resulting solution, what would be observed? Explain.
The solution would turn pink because the production of OH- makes the solution basic. In basic solutions, phenolphthalein turns pink.
Chlorine gas, an oxidizing agent, is bubbled into a solution of potassium bromide at 25 degrees C.
Cl2 + 2Br- ---> 2Cl- + Br2
Predict the sign of delta S for the reaction at 25 degrees C. Justify your prediction.
The sign of delta S is negative. One of the reactants, Cl2, is a gas at 25 degrees C, but there are no gaseous products. Gases have high entropies, so the entropy of the reactants is greater than the entropy of the products, making delta S negative.
Solid strontium hydroxide is added to a solution of nitric acid.
Sr(OH)2 + 2H+ ---> Sr2+ + 2H2O
How many moles of strontium hydroxide would react completely with 500 mL of 0.40 M nitric acid?
There is 0.20 mol of H+ in 500 mL of 0.40 M nitric acid. Because there are two moles of OH- in each mole of Sr(OH)2, 0.10 mol of Sr(OH)2 is needed to react completely.
A solution of barium chloride is added drop by drop to a solution of sodium carbonate, causing a precipitate to form.
Ba2+ + CO3 2- ---> BaCO3
What happens to the pH of the sodium carbonate solution as the barium chloride is added to it?
A solution of sodium carbonate is basic. When carbonate precipitates out, this decreases the pH.
A solution of copper(II) sulfate is spilled onto a sheet of freshly polished aluminum metal.
Cu^2+ + Al > Cu + Al^3+
Dimethyl ether is burned in air.
C2H6O + O2 > CO2 + H2O or C2H6O + O2 > CO2 + H2O + CO
A 0.1M nitrous acid solution is added to the same volume of a 0.1M sodium hydroxide solution.
HNO2 + OH^- > H2O + NO2^-
Hydrogen iodide gas is bubbled into a solution of lithium carbonate.
HI + CO3^2- > H2O + I^- + CO2 or HI + CO3^2- > I^- + HCO^3-
An acidic solution of potassium dichromate is added to a solution of iron(II) nitrate.
Cr2O7^2- + Fe^2+ + H^+ > Fe^3+ + Cr^3+ + H2O
Excess concentrated aqueous ammonia is added to a solution of nickel(II) bromide.
Ni2+ + NH3 --> [Ni(NH3)6]2+
A solution of sodium phosphate is added to a solution of aluminum nitrate.
PO4^3- + Al^3+ > AlPO4
Concentrated hydrochloric acid is added to a solution of sodium sulfide.
H^+ + OH^- + HS^- > H2O + H2S or H^+ + HS^- > H2S
Cadmium metal is placed in a solution of tin(II) chloride.
Cd + Sn^2+ > Sn + Cd^2+
Magnesium pellets are placed in 1.0M hydrochloric acid.
Mg + H^+ > Mg^2+ + H2
Ethanol is burned in oxygen.
C2H5OH + O2 --> CO2 + H2O
Solid barium oxide is added to distilled water.
BaO + H2O --> Ba2+ + OH-
Chlorine gas is bubbled into a cold, dilute solution of potassium hydroxide.
Cl2 + OH- --> Cl- + ClO- + (H2O)
A solution of iron(II) nitrate is exposed to air for an extended period of time.
Fe2+ + O2 (+ H2O) --> Fe2O3 or FeO(OH) or Fe(OH)3
Excess concentrated sulfuric acid is added to solid calcium phosphate
H2SO4 + Ca3(PO4)2 --> H3PO4 + CaSO4
Hydrogen gas is passed over hot iron (III) oxide. (Which substance is reduced?)
3 H2 + Fe2O3 --> 2 Fe + 3 H2O (The iron in the Fe2O3 is reduced to Fe.)
Small chunks of solid sodium are added to water. (Describe a test to confirm the gaseous product in your reaction.)
2 Na + 2 H2O --> 2 Na^+ + 2OH^- + H2 (If some of the gas is collected in a test tube of air and a lighted match is brought to the mouth of the tube, a popping noise will be heard.)
Hydrobromic acid is added to a solution of potassium hydrogen carbonate. (When a gas produced by the reaction is bubbled through limewater, what visible change is expected?)
HCO3^- + H^+ --> CO2 + H2O (Limewater becomes cloudy when carbon dioxide contacts it due to the formation of CaCO3.)
Aqueous potassium hydroxide is added to crystals of ammonium bromide. (When moistened litmus paper is held over the reaction container, what change will be observed?)
NH4Br + OH^- --> NH3 + Br^- + H2O (The litmus paper will turn blue because ammonia gas is produced.)
Hydrogen chloride gas is bubbled through a solution of potassium cyanide. (Which species behaves as a Bronsted base?)
HCl + CN^- --> HCN + Cl^-
Propanol is burned completely in air. (What kind of organic compound is propanol?)
2 C3H7OH + 9 O2 --> 6 CO2 + 8 H2O (It is an alcohol.)
Acetic acid is burned in an excess of oxygen. (How many molecules of products are formed from the burning of 1 molecule of acetic acid?)
CH3COOH + 2 O2 --> 2 CO2 + 2 H2O (4 molecules are produced.)
Solid aluminum oxide is added to a solution of sodium hydroxide.
Al2O3 + OH- --> Al(OH)4-
Solid calcium oxide is heated in the presence of sulfur trioxide gas.
CaO + SO3 --> CaSO4
An antacid (calcium hydroxide) neutralizes stomach acid (hydrochloric acid).
Ca(OH)2 + 2 HCl ------>CaCl2 + 2 H2O
An iron bar rusts. The iron reacts with oxygen in the air to make rust
4 Fe + 3 O2 ------> 2 Fe2O3
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