Exam 4, Intro to Chemistry

Ace your homework & exams now with Quizwiz!

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


Related study sets

RDBMS Relational Database Management System

View Set

Chapter 14: Water Table and Aquifers

View Set

[EDMENTUM]: Principles of Design: Mastery Test

View Set

Chapters 15 & 16, Civil Liberties

View Set

International Investments Midterm--

View Set

PN Adult Medical Surgical Online Practice 2023 B

View Set

Inclined Planes, Wedges, and Screws

View Set

Hootsuite #2 Exam - Social Advertising Landscape

View Set

Chemistry Unit 2 - The Law of Conservation of Energy (Endothermic vs. Exothermic) & The Law of Conservation of Matter, Phases of Matter, Separating Mixtures

View Set