Exam 4, Intro to Chemistry
lithium acetate
Soluble
Which ions are not spectator ions in the precipitation equation Pb(NO3)2+ 2KI PbI2 + 2KNO3? A) Pb2+ and NO3- B) K+ and NO3- C) Pb2+ and I- D) K+ and I
C) Pb2+ and I-
What is the oxidation state of manganese in the compound KMnO4? A) +7 B) -4 C) +2 D) +4
A) +7
Identify the reduced species in the following chemical process: Cu + 2AgCl CuC12 + 2Ag A) Ag+ B) Ag C) Cu D) Cl-
A) Ag+
If the following ions Ba2+, Cl-, K+ and SO42- are placed in a test tube, the precipitate formed is ________. A) BaSO4 B) K2SO4 C) KCl D) BaCl2
A) BaSO4
Which of the following reactions is an oxidation-reduction reaction? A) CH4 + 2 O2 CO2 + 2 H2O B) NaOH + HCl NaCl + H2O C) CaO + CO2 CaCO3 D) AgNO3 + NaCl AgCl + NaNO3
A) CH4 + 2 O2 ---> CO2 + 2 H2O
Which is the oxidizing agent in the reaction I2 + 6 H2O + 5 Cl2 2HIO3 + 10 HCl ? A) Cl2 B) H2O C) I2 D) the oxygen in water
A) Cl2
Which of the following is not isoelectronic with the rest? A) F B) Ne C) Mg 2+ D) O2-
A) F
Consult the EMF activity series and predict which of the following changes will occur if an iron nail is placed in an aqueous solution containing the (Sn2+) ion. A) Iron will be oxidized. B) Tin will be further oxidized. C) Nothing at all will happen (no reaction). D) Iron will be reduced.
A) Iron will be oxidized.
The spectator ions in the precipitation equation Pb(NO3)2+ 2KI PbI2 + 2KNO3 are ________. A) K+ and NO3- B) Pb2+ and I- C) Pb2+ and NO3- D) K+ and I
A) K+ and NO3-
Which hydroxide is water soluble? A) calcium hydroxide B) lithium hydroxide C) magnesium hydroxide D) lead (II) hydroxide
A) calcium hydroxide
Which of the following elements may have +4 charge when it becomes an ion? A) carbon B) magnesium C) aluminum D) chlorine
A) carbon
Which of the following elements may have more than one oxidation number ? A) hydrogen B) lithium C) sodium D) calcium
A) hydrogen
The precipitate formed when sodium chloride and lead (II) nitrate are placed in a test tube is ________. A) lead (II) chloride B) lead (II) hydroxide C) sodium nitrate D) No precipitate will be formed
A) lead (II) chloride
Mg + HBr MgBr2 + H2
SINGLE REPLACEMENT
The reducing agent is ________. A) oxidized in a redox equation B) reduced in an oxidation reaction C) oxidized in a reduction reaction D) reduced in a redox equation
A) oxidized in a redox equation
Which process releases energy? A. Bond Formation B. Bond Breaking C. Both A and B D. none of the above
A. Bond Formation
The equation K2SO4 + BaCl2 BaSO4 + KCl is an example of a ________ reaction. A) double replacement B) decomposition C) single replacement D) combination
A. Double Replacement
The equation Zn + CuCl2 Cu + ZnCl2 is an example of a ________ reaction. A) single replacement B) double replacement C) decomposition D) combination
A. Single Replacement
What is the oxidation state of the nitrogen atom in the compound NCl3? A) -3 B) +3 C) 0 D) +5
B) +3
What is the oxidation state of chromium in the compound K2Cr2O7? A) -1 B) +6 C) +7 D) +4
B) +6
The charge of nitrogen in the ammonium ion is ________. A) +1 B) -3 C) +3 D) -1
B) -3
The oxidation state of phosphorus in P4 is ________. A) +4 B) 0 C) -3 D) +3
B) 0
What is the sum of all coefficients after the following equation is balanced K2CrO4 + Al(NO3)3 Al2(Cr O4)3 + KNO3? A) 8 B) 12 C) 4 D) 15
B) 12
What is the coefficient for iron after the following reaction is balanced Fe + O2 Fe2O3? A) 6 B) 4 C) 1 D) 3
B) 4
Which of the following reactions is a combustion reaction? A) AgNO3 + NaCl AgCl + NaNO3 B) CH4 + 2 O2 CO2 + 2 H2O C) NaOH + HCl NaCl + H2O D) CaO + CO2 CaCO3
B) CH4 + 2 O2 ---> CO2 + 2 H2O
If the following ions Ca2+, NO3- , Na+ and SO42- are placed in a test tube, the precipitate formed is ________. A) NaNO3 B) CaSO4 C) Na2SO4 D) Ca(NO3)2
B) CaSO4
Which of the following equations has 1:1:1:1 as the relative ratio of coefficients when balanced? A) CH4 + O2 CO2 + H2O B) NaOH + HCl NaCl + H2O C) H2SO4 + KOH K2SO4 + H2O D) Zn + HCl H2 + ZnCl2
B) NaOH + HCl ---> NaCl + H2O
Which hydroxide is water insoluble? A) barium hydroxide B) aluminum hydroxide C) sodium hydroxide D) calcium hydroxide
B) aluminum hydroxide
What is reduction? A) loss of electrons B) gain of electrons C) increase in oxidation number D) two of the above
B) gain of electrons
In which of the following is oxygen not at the -2 oxidation state? A) methanol B) hydrogen peroxide C) water D) carbon dioxide
B) hydrogen peroxide
Which of the following elements may have an oxidation number other than +2? A) magnesium B) iron C) calcium D) barium
B) iron
In which case is chlorine in its highest oxidation state? A) sodium chloride B) sodium perchlorate C) sodium hypochlorite D) sodium chlorate
B) sodium perchlorate
Halogens have often (but not always) ________ as the main oxidation state. A) +7 B) -3 C) -1 D) +1
C) -1
The overall charge of sodium dichromate is ________. A) -2 B) +2 C) 0 D) +1
C) 0
After balancing the equation Fe2O3 + Al Al2O3 + Fe the correct coefficients are respectively ________. A) 2: 3: 3: 4 B) 1: 2: 2: 1 C) 1: 2: 1: 2 D) 2: 3: 2: 3
C) 1: 2: 1: 2
It takes ________ moles of calcium hydroxide to neutralize ________ moles of sulfuric acid. A) 1; 2 B) 2; 1 C) 1; 1 D) 1; 3
C) 1; 1
It takes ________ moles of potassium hydroxide to neutralize ________ moles of sulfuric acid. A) 1; 1 B) 3; 1 C) 2; 1 D) 1; 2
C) 2; 1
The equation for rust formation is ________. A) CuO + Fe Cu + FeO B) MnO2 + 2 Fe Mn + 2 FeO C) 4 Fe + 3 O2 + 2 H2O 2 Fe2O3 + H2O D) 2 Fe + O2 2 FeO
C) 4 Fe + 3 O2 + 2 H2O ---> 2 Fe2O3 + H2O
Which of the following equations is NOT a combination reaction? A) C2H4 + Br2 C2H4Br2 B) H2 + O2 H2O C) CH4 + O2 CO2 + H2O D) Fe + O2 Fe3O4
C) CH4 + O2 -----> CO2 + H2O
Which of the following equations is a combustion reaction? A) MgO + HCl MgCl2 + H2O B) KClO3 KCl + O2 C) CH4 + O2 CO2 + H2O D) Al + Fe2O3 Al2O3 + Fe
C) CH4 + O2 ----> CO2 + H2O
Identify the oxidizing agent in the following chemical process: Fe + Cu(NO3)2 Fe(NO3)2 + Cu A) Fe B) Cu C) Cu+2 D) NO3-
C) Cu+2
Which of the following reactions is a decomposition reaction? A) HCl + NaOH NaCl + H2O B) Mg + HCl H2 + MgCl2 C) KClO3 KCl + O2 D) CaCl2 + H2O CaCl2 · 2H2O
C) KClO3 -----> KCl + O2
Which of the following is most easily oxidized? A) Pb B) Cr C) Li D) N i
C) Li
Which of the following reactions is a single replacement reaction? A) CaCl2 + H2O CaCl2 · 2H2O B) KClO3 KCl + O2 C) Mg + HCl H2 + MgCl2 D) HCl + NaOH NaCl + H2O
C) Mg + HCl ---> H2 + MgCl2
In which case is the greatest number of electrons transferred? A) 2 Mg + O2 2 MgO B) CuCl CuCl2 C) NaClO2 NaClO4 D) NaClO NaClO2
C) NaClO2 ---> NaClO4
A fuel cell is essentially a battery which uses the following reaction to produce electricity: 2H2 + O2 2H2O. What is happening at the cathode of such a fuel cell? A) Oxygen is being oxidized. B) Nothing at all is happening there. C) Oxygen is being reduced. D) Hydrogen is being oxidized.
C) Oxygen is being reduced.
Identify the reducing agent in the following chemical process (a lead storage battery): Pb + PbO2 + 2H+ + 2HSO4- 2PbSO4 + 2H2O . A) H+ B) 2HSO4- C) Pb D) PbO2
C) Pb
The precipitate formed when barium nitrate and potassium chromate are placed in a test tube is ________. A) potassium nitrate B) barium nitrate C) barium chromate D) potassium chromate
C) barium chromate
Which of the following is the least soluble in water? A) potassium chloride B) sodium sulfate C) calcium sulfate D) lead (II) nitrate
C) calcium sulfate
In the following reaction: Fe2O3 + 3CO 2Fe + 3CO2, which atom(s) has a more positive oxidation state on the product side than the reactant side? A) carbon and iron B) iron C) carbon D) oxygen
C) carbon
Which lead (II) compound is water soluble? A) lead (II) carbonate B) lead (II) chloride C) lead (II) nitrate D) lead (II) sulfate
C) lead (II) nitrate
Which of the following elements may not have an oxidation number of -1? A) chlorine B) fluorine C) sodium D) hydrogen
C) sodium
The reaction Zn + Cu+2 Zn+2 + Cu is an example of a ________ battery. A) copper-zinc B) copper-silver C) zinc-copper D) copper-zinc--hydrogen
C) zinc-copper
H2 + O2 H2O
COMBINATION
CH4 + O2 CO2 + H2O
COMBUSTION
The charge of chlorine in the perchlorate ion is ________. A) -1 B) +8 C) +6 D) +7
D) +7
What is the sum of the oxidation states in the following species H2SbO3- ? A) -2 B) +2 C) 0 D) -1
D) -1
Which ions are not spectator ions in the precipitation equation AgNO3 + NaCl AgCl + NaNO3? A) Ag+ and NO3- B) Na+ and Cl- C) Na+ and NO3- D) Ag+ and Cl-
D) Ag+ and Cl-
Which of the following is true about the following equation: Mg + O2 2 MgO ? A) Oxygen is reduced. B) Magnesium is oxidized. C) The oxidation of magnesium in MgO is +2. D) All of the above are true
D) All of the above are true
Which of the following is true for reaction Zn + CuCl2 ZnCl2 + Cu ? A) The solution will turn blue. B) The solution will turn from blue to light blue. C) The gray zinc powder will disappear. D) Both B and C are correct
D) Both B and C are correct
Which of the following balanced reactions does not have at least one 6 as a coefficient? A) H3PO4 + Ba(OH)2 Ba3(PO4)2 + H2O B) C6H12O6 + O2 CO2 + H2O C) H2SO4 + Al(OH)3 Al2(SO4)3 + H2O D) C2H2 + O2 CO2 + H2O
D) C2H2 + O2 ----> CO2 + H2O
Which of the following is the most easily reduced? A) Zn2+ B) Fe2+ C) M n2+ D) Cu2+
D) Cu2+
Which of the following is NOT a double replacement reaction? A) AgNO3 + NaCl AgCl + NaNO3 B) H2SO4 + Mg(OH)2 H2O + MgSO4 C) AlCl3 + H2O Al(OH)3 + HCl D) Mg + HCl H2 + MgCl2
D) Mg + HCl ---> H2 + MgCl2
Which element is reduced in the reaction H2SO4 + Al(OH)3 Al2(SO4)3 + H2O ? A) sulfur B) oxygen C) aluminum D) No elements were either oxidized or reduced.
D) No elements were either oxidized or reduced.
In the reaction H2O + CO2 H2CO3, which element was oxidized? A) carbon B) hydrogen C) oxygen D) None of the elements was oxidized.
D) None of the elements was oxidized.
Which atom in the compound K2C2O4 has a positive oxidation state? A) potassium B) carbon C) both potassium and oxygen D) both potassium and carbon
D) both potassium and carbon
When aqueous solutions of calcium hydroxide and hydrobromic acid are mixed, the spectator ions are ________. A) hydrogen and hydroxide B) hydrogen and bromide C) calcium and hydroxide D) calcium and bromide
D) calcium and bromide
Which chloride is water soluble? A) mercury (I) chloride B) silver (I) chloride C) lead (II) chloride D) calcium chloride
D) calcium chloride
What is electricity? A) flow of protons B) flow of atoms C) flow of neutrons D) flow of electrons
D) flow of electrons
The oxidizing agent is ________. A) reduced in an oxidation reaction B) oxidized in a reduction reaction C) oxidized in a redox equation D) reduced in a redox equation
D) reduced in a redox equation
When aqueous solutions of sodium phosphate and calcium nitrite are mixed, the spectator ions are ________. A) calcium and phosphate B) sodium and phosphate C) calcium and nitrite D) sodium and nitrite
D) sodium and nitrite
In a chemical bond, which atom gets to own the shared electrons? A) the larger element B) the smaller element C) the most electropositive element D) the more electronegative element
D) the more electro-negative element
In a gas phase reaction_________. A. Only reactants are gases B. Solids and Liquids may be present, but at least one regent must be a gas. C. Only products are gases D. Both reactants and products are gases
D. Both Reactants and products are gases
NaClO3 NaCl + O2
DECOMPOSITION
H2SO4 + NaOH Na2SO4 + H2O
DOUBLE REPLACEMENT
All hydroxides are water insoluble
FALSE
Ammonium phosphate is water soluble but ammonium carbonate is water insoluble
FALSE
Bond breaking releases energy.
FALSE
In a combination reaction two or more compounds yield two or more compounds.
FALSE
It takes two moles of sulfuric acid to neutralize one mole of sodium hydroxide.
FALSE
One needs to balance a chemical reaction before identifying the type of reaction.
FALSE
The coefficients in the balanced equation Au2S3 + H2 Au + H2S are 1: 6: 2: 3.
FALSE
The coefficients in the balanced equation C8H6 + O2 CO2 + H2O are 1: 19: 8: 3.
FALSE
All nitrates are water soluble
TRUE
Another term for the combination reaction is synthesis.
TRUE
Ca 2+, K+ and Cl- have the same number of electrons
TRUE
Electricity is the flow of electrons
TRUE
In a decomposition reaction one compound breaks down into two or more simpler compounds or elements.
TRUE
Silver (I) chloride is water insoluble while silver (I) acetate is water soluble.
TRUE
The cathode is the electrode where reduction occurs
TRUE
aluminum hydroxide
insoluble
lead (II) sulfate
insoluble
silver chloride
insoluble
potassium bromide
soluble
potassium nitrate
soluble
