chem 3 exam

What type of reaction is the generic equation A+B= AB ? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

A

The Roman numerals in the reaction given represent the coefficients in the balanced chemical equation. What are the values of the coefficients? I NH3 + II O2 III NO + IV H2O I II III IV a. 2 5 2 3 b. 4 5 4 6 c. 2 2 2 3 d. 4 4 4 6 e. 8 10 8 12

B

The Roman numerals in the reaction given represent the coefficients in the balanced chemical equation. What are the values of the coefficients? I CH3OH + II O2 III CO2 + IV H2O I II III IV a. 1 2 1 2 b. 1 3 1 2 c. 2 3 2 4 d. 2 5 2 2 e. 4 6 4 8

C

The Roman numerals in the reaction given represent the coefficients in the balanced chemical equation. What are the values of the coefficients? I KO2 + II H2O III KOH + IV O2 I II III IV a. 2 1 2 1 b. 2 2 4 3 c. 1 1 1 1 d. 4 2 4 3 e. 8 4 8 6

D

) Considering the following precipitation reaction: Which compound would not form ions in the complete ionic equation? A) PbI2 B) KNO3 C) Pb(NO3)2 D) KI E) All compounds form ions in the complete ionic equation

a

) If a sample of carbon dioxide contains 3.8 moles of oxygen atoms, how many moles of carbon dioxide are in the sample? A) 1.9 B) 3.8 C) 7.6 D) 11.4 E) none of the above

a

) In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products? A) (s) B) (g) C) (l) D) (w) E) none of the above

a

) What are the coefficients for the following reaction when it is properly balanced? A) 2, 1, 1, 1 B) 2, 1, 2, 2 C) 1, 2, 1/2, 1 D) 1, 1, 1, 2 E) none of the above

a

) When water is heated, bubbles form in the water. Is this evidence of a chemical reaction? Why? A) No, boiling water is a physical change. B) Yes, the formation of a gas is evidence of a chemical reaction. C) No, the formation of gas bubbles is a secondary chemical reaction which is ignored. D) Yes, the formation of a gas is proof a new compound has been made. E) none of the above

a

A redox reaction has occurred __________. A) when a substance reacts with elemental oxygen B) when an alkali metal reacts with an alkaline earth metal C) when one substance transfers electrons or protons to another D) when one substance forms a solid E) when all of the above occur

a

In the reaction shown below, which substances are dissolved in water? Cu(s) + H2SO4(aq) CuSO4(aq) + H2(g) a. H2SO4 and CuSO4 b. Cu and CuSO4 c. Cu d. H2 and H2SO4 e. H2 and Cu

a

One mole of potassium sulfate contains: A) 4 moles of oxygen. B) 2 moles of sulfur. C) 1 mole of potassium. D) 3 moles of potassium. E) none of the above

a

Potassium metal and chlorine gas react in a combination reaction to produce an ionic compound. What is the correct balanced equation for this reaction? a. 2 K(s) + Cl2(g) 2 KCl(s) b. K(s) + Cl2(g) KCl(s) c. K(s) + Cl(g) KCl(s) d. K2(s) + Cl2(g) 2 KCl(s) e. K(s) + Cl2(g) KCl2(s)

a

What type of a reaction occurs when a silver nitrate solution is mixed with sodium chloride solution? A) precipitation B) acid-base neutralization C) oxidation-reduction D) gas evolution E) no reaction

a

When the equation, is balanced, the coefficient of O2 is: A) 3 B) 4 C) 5 D) 8 E) none of the above

a

When water is heated, bubbles form in the water. Is this evidence of a chemical reaction? Why? A) No, boiling water is a physical change. B) Yes, the formation of a gas is evidence of a chemical reaction. C) No, the formation of gas bubbles is a secondary chemical reaction which is ignored. D) Yes, the formation of a gas is proof a new compound has been made. E) none of the above

a

Which of the following compounds is INSOLUBLE? A) magnesium phosphate B) magnesium sulfate C) magnesium iodide D) magnesium nitrate E) none of the above

a

) A 42.7 gram sample of potassium nitrate contains how many grams of potassium? A) 39.1 B) 16.5 C) 21.4 D) 8.54 E) none of the above

b

) How many moles of carbon are in 3.5 moles of calcium carbonate? A) 10.5 B) 3.5 C) 7 D) 100.09 E) none of the above

b

) What are the coefficients for the following reaction when it is properly balanced? acetate A) 2, 1, 1, 1 B) 2, 1, 1, 2 C) 3, 2, 2, 1 D) 1, 1, 2, 2 E) none of the above

b

) You have 10.0 g each of Na, C, Pb, Cu and Ne. Which contains the largest number of moles? A) Na B) C C) Pb D) Cu E) Ne

b

For the reaction given below, how many molecules of aluminum will react if 12 molecules of Br2 react and 8 molecules of AlBr3 are produced? 2 Al + 3 Br2 2 AlBr3 a. 4 b. 8 c. 12 d. 16 e. 40

b

If you had an aqueous mixture that contained , , and cations, how many different solids could precipitate if a chloride solution was added? A) 1 B) 2 C) 3 D) 4 E) no solids will precipitate

b

In comparing 1 mole of carbon atoms to one mole of magnesium atoms, which statement is true? A) The mass of 1 mole of carbon is greater than the mass of 1 mole of magnesium. B) The mass of 1 mole of magnesium is greater than the mass of 1 mole of carbon. C) The mass of 1 mole of carbon is the same as the mass of 1 mole of magnesium. D) There are more atoms in 1 mole of magnesium than in 1 mole of carbon. E) none of the above

b

What are the coefficients for the following reaction when it is properly balanced? A) 2, 1, 1, 2 B) 2, 2, 1, 2 C) 2, 2, 2, 1 D) 1, 1, 2, 2 E) none of the above

b

What type of a reaction occurs when a sodium hydroxide solution is mixed with an acetic acid solution? A) precipitation B) acid-base neutralization C) oxidation-reduction D) gas evolution E) no reaction

b

What type of reaction is the generic equation AB= A+B ? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

b

Which of the following statements about balancing reactions is FALSE? A) If there is no coefficient or subscript, a one is implied. B) When coefficients are added the type of compounds is changed in the chemical reaction. C) Subscripts are multiplied by the coefficients to determine the number of atoms in a compound. D) Coefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom. E) All of the above statements are true.

b

) A reaction which forms a solid product is an example of a(n)________. A) oxidation-reduction reaction B) combustion reaction C) precipitation reaction D) gas evolution reaction E) none of the above

c

) How many moles of fluorine are in 3.2 moles of xenon hexafluoride? A) 22.4 B) 12.8 C) 19.2 D) 16 E) none of the above

c

) What type of reaction is the generic equation A+BC = AC +B? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

c

) Which of the following compounds is SOLUBLE? A) copper carbonate B) calcium carbonate C) potassium carbonate D) strontium carbonate E) none of the above

c

) Which of the following statements about redox reactions is FALSE? A) Oxidation is the loss of electrons. B) Reduction is the gain of electrons. C) A reaction can result in either oxidation or reduction, not both. D) A reaction involving elemental oxygen is a redox reaction. E) All of the above statement are true.

c

A 15.5 gram sample of diphosphorous pentoxide contains how many grams of phosphorous? A) 3.38 B) 1.69 C) 6.76 D) 13.5 E) none of the above

c

Before a chemical equation can be written, one must know A) the atomic mass of all the elements involved. B) the molar mass of all the compounds. C) the symbols and formulas of all reactants and products. D) the number of moles of all reactants and products. E) none of the above.

c

Calculate the molar mass of ammonium carbonate. A) 78.05 g/mol B) 88.05 g/mol C) 96.09 g/mol D) 112.09 g/mol E) none of the above

c

In the reaction given below, for every two molecules of aluminum oxide consumed, how many molecules of oxygen are produced? 2 Al2O3 4 Al + 3 O2 a. 1 b. 2 c. 3 d. 6 e. 9

c

In the reaction shown below, which substance is a solid? Cu(s) + H2SO4(aq) CuSO4(aq) + H2(g) a. H2SO4 and CuSO4 b. Cu and CuSO4 c. Cu d. H2 and H2SO4 e. H2 and Cu

c

One mole of ammonium nitrate contains: A) 3 moles of hydrogen. B) 2 moles of oxygen. C) 2 moles of nitrogen. D) 1 mole of nitrogen. E) none of the above

c

The Roman numerals in the reaction given represent the coefficients in the balanced chemical equation. What are the values of the coefficients? I Al + II H2SO4 III Al2(SO4)3 + IV H2 I II III IV a. 3 1 3 2 b. 3 1 1 3 c. 2 3 1 3 d. 2 3 2 3 e. 4 6 1 6

c

The Roman numerals in the reaction given represent the coefficients in the balanced chemical equation. What are the values of the coefficients? I Fe3O4 + II H2 III Fe + IV H2O I II III IV a. 1 1 3 2 b. 1 2 3 2 c. 1 4 3 4 d. 2 8 6 8 e. 2 4 6 4

c

The Roman numerals in the reaction given represent the coefficients in the balanced chemical equation. What are the values of the coefficients? I Ni(ClO4)2 + II K2S III KClO4 + IV NiS I II III IV a. 2 1 1 2 b. 1 2 1 1 c. 1 1 2 1 d. 1 1 1 2 e. 1 2 2 1

c

What are the coefficients for the following reaction when it is properly balanced? A) 2, 1, 1, 3 B) 2, 3, 1, 6 C) 2, 3, 6, 1 D) 6, 1, 3, 2 E) none of the above

c

What type of a reaction occurs when potassium metal reacts with fluorine gas? A) precipitation B) acid-base neutralization C) oxidation-reduction D) gas evolution E) no reaction

c

When the equation, is balanced, the coefficient of hydrogen is: A) 1 B) 2 C) 3 D) 4 E) none of the above

c

Which of the following everyday substances does not typically contain an acid? A) lemons B) vinegar C) soap D) limes E) all of the above

c

Which of the following types of compounds will not undergo a gas evolution reaction when acid is added? A) sulfides B) carbonates C) hydroxides D) bisulfites E) none of the above

c

You have 10.0 g each of Na, C, Pb, Cu and Ne. Which contains the smallest number of moles? A) Na B) C C) Pb D) Cu E) Ne

c

) A reaction which forms a gaseous product is an example of a(n)________. A) oxidation-reduction reaction B) combustion reaction C) precipitation reaction D) gas evolution reaction E) none of the above

d

) Calculate the molar mass of calcium nitrate. A) 136.03 g/mol B) 102.09 g/mol C) 132.10 g/mol D) 164.10 g/mol E) none of the above

d

) Which of the following statements about the mole is FALSE? A) The size of a mole of atoms has a reasonable mass. B) A mole of an element corresponds to one Avogadro number of atoms. C) One mole of an element has a mass equal to its atomic mass expressed in grams. D) One mole of water contains 1/2 mole of oxygen atoms. E) none of the above

d

A precipitate is expected to be formed when an aqueous solution of sodium sulfate is added to an aqueous solution of A) iron(III) chloride B) potassium chloride C) magnesium chloride D) barium chloride E) none of the above

d

An aqueous solution is: A) any liquid with another compound dissolved in it. B) an ionic compound with water dissolved in it. C) water with a molecular compound dissolved in it. D) water with another compound dissolved in it. E) none of the above

d

An aqueous solution is: A) any liquid with another compound dissolved in it. B) an ionic compound with water dissolved in it. C) water with a molecular compound dissolved in it. D) water with another compound dissolved in it. E) none of the above

d

One mole of ammonium nitrite contains: A) 2 moles of nitrogen atoms B) 4 moles of hydrogen atoms C) 2 moles of oxygen atoms D) All of A, B, and C E) None of A, B, and C

d

The mass of one mole of carbon dioxide is ________ g. A) 28.01 B) 384.4 C) 32.00 D) 44.01 E) none of the above

d

What are the coefficients for the following reaction when it is properly balanced? A) 2, 1, 1, 1 B) 2, 3, 2, 2 C) 5, 2, 2, 1 D) 1, 1, 1, 1 E) none of the above

d

What are the coefficients for the following reaction when it is properly balanced? A) 2, 1, 1, 1 B) 2, 3, 2, 2 C) 5, 2, 2, 1 D) 1, 1, 1, 1 E) none of the above

d

What are the coefficients for the following reaction when it is properly balanced? A) 2, 1, 3, 1 B) 2, 3, 2, 2 C) 1, 3, 2, 1 D) 2, 1, 1, 2 E) none of the above

d

What is mass of 0.560 moles of chlorine gas? A) 19.9 B) 63.3 C) 127 D) 39.7 E) none of the above

d

What is the gas produced when hydrochloric acid is reacted with ammonium carbonate? A) ammonia B) chlorine C) hydrogen D) carbon dioxide E) none of the above

d

What type of a reaction occurs when a hydrochloric acid solution is mixed with a sodium bicarbonate solution? A) precipitation B) acid-base neutralization C) oxidation-reduction D) gas evolution E) no reaction

d

What type of reaction is the generic equation AB+CD = AD + CB ? A) synthesis/combination B) decomposition C) single displacement D) double-displacement E) none of the above

d

When the equation, is balanced, the coefficient of O2 is: A) 3 B) 4 C) 5 D) 8 E) none of the above

d

Which of the following compounds is INSOLUBLE? A) potassium acetate B) lithium carbonate C) magnesium bromide D) aluminum sulfide E) none of the above

d

Which of the following compounds is SOLUBLE? A) aluminum hydroxide B) aluminum sulfide C) aluminum carbonate D) aluminum sulfate E) none of the above

d

1) Which of the following is NOT evidence that a chemical reaction has occurred? A) color change B) solid formation C) gas formation D) release of heat E) All of the above are evidence of a chemical reaction.

e

All of the following compounds are soluble in water EXCEPT A) NaCl B) CaCl2 C) FeCl3 D) NH4Cl E) PbCl2

e

Considering the following precipitation reaction: Which of the following statements about writing molecular, complete and net ionic equations is FALSE? A) A molecular equation is a chemical equation showing the complete, neutral formulas for every compound in a reaction. B) A complete ionic equation is a chemical equation showing all of the species as they are actually present in solution. C) A net ionic equation is an equation showing only the species that actually change during the reaction. D) A spectator ion remains unchanged in the reaction and appears on both sides of the equation. E) All of the statements are true.

e

In the reaction given below, if 12 molecules of aluminum oxide are consumed, how many molecules of oxygen gas are produced? 2 Al2O3 4 Al + 3 O2 a. 3 b. 4 c. 6 d. 12 e. 18

e

The Roman numerals in the reaction given represent the coefficients in the balanced chemical equation. What are the values of the coefficients? I BaCl2 + II AgNO3 III Ba(NO3)2 + IV AgCl I II III IV a. 1 2 2 1 b. 1 1 2 2 c. 2 1 1 1 d. 1 1 1 2 e. 1 2 1 2

e

The Roman numerals in the reaction given represent the coefficients in the balanced chemical equation. What are the values of the coefficients? I K2S + II AlCl3 III KCl + IV Al2S3 I II III IV a. 3 2 3 2 b. 2 3 2 3 c. 1 1 2 1 d. 3 2 6 2 e. 3 2 6 1

e

What is the molar mass of aluminum sulfate? A) 123.0 g/mol B) 278.0 g/mol C) 306.2 g/mol D) 315.2 g/mol E) 342.2 g/mol

e

What type of a reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution? A) precipitation B) acid-base neutralization C) oxidation-reduction D) gas evolution E) no reaction

e

Which of the following is NOT a sign of a chemical reaction? A) absorbing heat B) emission of heat C) color change D) solid formation E) All of the above are signs of a chemical reaction.

e

Which of the following is NOT evidence that a chemical reaction has occurred? A) color change B) solid formation C) gas formation D) emission of light E) All of the above are evidence of a chemical reaction.

e