Question 1

Which one of the following compounds is insoluble in water?

Accepted Answer

Barium sulfate (BaSO₄) is insoluble in water due to its high lattice energy and low solubility product (Ksp).

Question 2

Aluminum metal reacts with aqueous iron( II) chloride to form aqueous aluminum chloride and iron metal. What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?

Accepted Answer

The balanced chemical equation for the reaction is:
2Al(s) + 3FeCl2(aq) → 2AlCl3(aq) + 3Fe(s)
The stoichiometric coefficient for aluminum is 2.

Question 3

Calcium phosphate reacts with sulfuric acid to form calcium sulfate and phosphoric acid. What is the coefficient for sulfuric acid when the equation is balanced using the lowest, whole-number coefficients?

Accepted Answer

The answer of Calcium phosphate reacts with sulfuric acid to...

Question 4

Which of the compounds of H₂C₂O_4, Ca(OH)₂, KOH, and H I behave as acids when they are dissolved in water?

Accepted Answer

The answer of Which of the compounds of H₂C₂O_4, Ca(OH)₂,...

Question 5

The mixing of which pair of reactants will result in a precipitation reaction?

Accepted Answer

Option A does not result in a precipitation reaction as both CsI and NaOH are soluble in water. 
Option B does not result in a precipitation reaction as Ca(OH)2 is a soluble base and will not form a precipitate with HCl. 
Option C does result in a precipitation reaction as both K2SO4 and Ba(NO3)2 are soluble in water but do form an insoluble compound, BaSO4. 
Option D does not result in a precipitation reaction as both NaNO3 and NH4Cl are soluble in water.

Question 6

The mixing of which pair of reactants will result in a precipitation reaction?

Accepted Answer

When Ba(NO₃)₂(aq) and Na₂CO₃(aq) are mixed, they will react to form BaCO₃(s) which is insoluble and will precipitate out of solution.

Question 7

How many H⁺ ions can the acid H₂SO₄ donate per molecule?

Accepted Answer

The acid H₂SO₄ can donate two H⁺ ions per molecule because it has two distinct sulfuric acid-like groups.

Question 8

What reagent could not be used to separate Br^- from CO₃^2- when added to an aqueous solution containing both?

Accepted Answer

AgNO3 can be used to selectively precipitate bromide ions (Br-) as a silver bromide (AgBr) precipitate. This method relies on the low solubility of AgBr in water. However, the other reagents listed (Ca(NO3)2, Cu(NO3)2, and Fe(NO3)3) do not selectively react with or precipitate Br- ions, so they cannot be used to separate Br^- from CO₃^2-.

Question 9

What reagent could be used to separate Br^- from CH₃CO₂^-when added to an aqueous solution containing both?

Accepted Answer

AgNO3(aq) could be used to separate Br- (from BrS1U1P1-S1S1P0) as it forms a precipitate with Ag+ ions. However, it does not react with CHS1U1B13S1U1B0COS1U1B12S1U1B0S1U1P1- (from CHS1U1B13S1U1B0COS1U1B12S1U1B0S1U1P1- S1S1P0). Thus, upon the addition of AgNO3(aq) to the solution, Br- will form a precipitate while CHS1U1B13S1U1B0COS1U1B12S1U1B0S1U1P1- will remain in solution.

Question 10

Which one of the following compounds is soluble in water?

Accepted Answer

Pb(NO3)2 is soluble in water because all nitrates (NO3-) are soluble in water according to solubility rules.

Question 11

Which of the following compounds is an Arrhenius base?

Accepted Answer

The answer of Which of the following compounds is an...

Question 12

Lead ions can be precipitated from aqueous solutions by the addition of aqueous iodide: (aq) + (aq) → (s) Lead iodide is virtually insoluble in water so that the reaction appears to go to completion. How many millilitres of 3.550 mol L^-1 HI(aq) must be added to a solution containing 0.700 mol of to completely precipitate the lead?

Accepted Answer

The balanced chemical equation is:

Pb(NO3)2(aq) + 2HI(aq) → PbI2(s) + 2HNO3(aq)

From the equation, it follows that 1 mole of lead nitrate reacts with 2 moles of hydroiodic acid to produce 1 mole of lead iodide. Therefore, in order to completely precipitate 0.700 mol of lead nitrate, we need 1.400 mol of hydroiodic acid.

We can use the formula:

n = C x V

where n is the number of moles, C is the concentration in mol/L, and V is the volume in L.

Rearranging the formula, we get:

V = n / C

Substituting the values, we get:

V = 1.400 mol / 3.550 mol/L = 0.394 L = 394 mL

Therefore, we need 394 mL of 3.550 mol/L hydroiodic acid to completely precipitate 0.700 mol of lead nitrate. The correct answer is option C.

Question 13

What is the reduction half-reaction for the following overall galvanic cell reaction? Co²⁺(aq) + 2Ag(s) → Co(s) + 2 Ag⁺(aq)

Accepted Answer

The answer of What is the reduction half-reaction for the...

Question 14

Which of the following compounds is an Arrhenius base?

Accepted Answer

CsOH is the only compound that fits the definition of an Arrhenius base, which is a substance that produces hydroxide ions (OH-) when dissolved in water. CsOH dissociates in water to form Cs+ and OH- ions, making it an Arrhenius base. The other compounds listed do not produce hydroxide ions and therefore are not Arrhenius bases.

Question 15

Which pair of compounds is soluble in water?

Accepted Answer

LiI and Ca(NOS13)2 are both ionic compounds and therefore dissolve in water through ion-dipole interactions. CuS and Na2S do not dissolve well in water because they are insoluble in room-temperature water due to their low solubility product constants. HgBr2 and HgS are insoluble in water because they are both insoluble inorganic compounds. KSNO and CaCO3 are both slightly soluble in water due to their low solubility product constants.

Question 16

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients? ________ C₃H₆O(l) + ________ O₂(g) → ________ CO₂(g) + ________ H₂O(l)

Accepted Answer

When the equation is balanced using the lowest, whole-number coefficients, the stoichiometric coefficient for oxygen is 4.

Question 17

Which of the following compounds is an Arrhenius base?

Accepted Answer

An Arrhenius base is a substance that increases the concentration of hydroxide ions (OH⁻) in aqueous solution. C₆H₅NH₂ (aniline) is a weak base that can accept a proton and increase OH⁻ concentration in water.

Question 18

Silver ions can be precipitated from aqueous solutions by the addition of aqueous chloride: (aq) + (aq) → AgCl(s) Silver chloride is virtually insoluble in water so that the reaction appears to go to completion. How many grams of solid NaCl must be added to 25.0 mL of 0.376 mol L^-1 solution to completely precipitate the silver?

Accepted Answer

1. Write the balanced chemical equation:

AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)

2. Calculate the amount of AgNO3 present in the given solution:

n = C x V = 0.376 mol/L x 0.0250 L = 0.0094 mol

3. Use the stoichiometry of the balanced equation to find the amount of NaCl needed to react with all the AgNO3:

From the equation, it can be seen that 1 mole of AgNO3 reacts with 1 mole of NaCl to form 1 mole of AgCl. Therefore, the amount of NaCl needed is also 0.0094 mol.

4. Calculate the mass of NaCl needed:

m = n x M = 0.0094 mol x 58.44 g/mol = 0.549 g

So the answer is B) 0.549 g.

Question 19

HBr, H I, HNO₃, NaBr, and KNO₃ are all classified as ________.

Accepted Answer

All of the given compounds are salts, which are typically classified as strong electrolytes because they completely dissociate into ions in water. None of them are acids or nonelectrolytes, and only a few (such as HNO₃) are weak electrolytes.

Question 20

Which of the following solutions will have the highest electrical conductivity?

Accepted Answer

Aluminum sulfate, Al2(SO4)3, dissociates into 5 ions (2 Al^3+ and 3 SO4^2-) per formula unit, resulting in a higher total ion concentration compared to the other options, which increases electrical conductivity.

Quiz 4: Chemical Reactions and Stoichiometry

Which one of the following compounds is insoluble in water?

Aluminum metal reacts with aqueous iron( II) chloride to form aqueous aluminum chloride and iron metal. What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?

Calcium phosphate reacts with sulfuric acid to form calcium sulfate and phosphoric acid. What is the coefficient for sulfuric acid when the equation is balanced using the lowest, whole-number coefficients?

Which of the compounds of H₂C₂O_4, Ca(OH) ₂, KOH, and H I behave as acids when they are dissolved in water?

The mixing of which pair of reactants will result in a precipitation reaction?

The mixing of which pair of reactants will result in a precipitation reaction?

How many H⁺ ions can the acid H₂SO₄ donate per molecule?

What reagent could not be used to separate Br^- from CO₃^2- when added to an aqueous solution containing both?

What reagent could be used to separate Br^- from CH₃CO₂^-when added to an aqueous solution containing both?

Which one of the following compounds is soluble in water?

Which of the following compounds is an Arrhenius base?

What is the reduction half-reaction for the following overall galvanic cell reaction? Co²⁺(aq) + 2Ag(s) → Co(s) + 2 Ag⁺(aq)

Which of the following compounds is an Arrhenius base?

Which pair of compounds is soluble in water?

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients? C₃H₆O(l) + O₂(g) → CO₂(g) + H₂O(l)

Which of the following compounds is an Arrhenius base?

HBr, H I, HNO₃, NaBr, and KNO₃ are all classified as ________.

Which of the following solutions will have the highest electrical conductivity?

Quiz 4: Chemical Reactions and Stoichiometry

Which one of the following compounds is insoluble in water?

Aluminum metal reacts with aqueous iron( II) chloride to form aqueous aluminum chloride and iron metal. What is the stoichiometric coefficient for aluminum when the chemical equation is balanced using the lowest, whole-number stoichiometric coefficients?

Calcium phosphate reacts with sulfuric acid to form calcium sulfate and phosphoric acid. What is the coefficient for sulfuric acid when the equation is balanced using the lowest, whole-number coefficients?

Which of the compounds of H2C2O4, Ca(OH) 2, KOH, and H I behave as acids when they are dissolved in water?

The mixing of which pair of reactants will result in a precipitation reaction?

The mixing of which pair of reactants will result in a precipitation reaction?

How many H+ ions can the acid H2SO4 donate per molecule?

What reagent could not be used to separate Br- from CO32- when added to an aqueous solution containing both?

What reagent could be used to separate Br- from CH3CO2- when added to an aqueous solution containing both?

Which one of the following compounds is soluble in water?

Which of the following compounds is an Arrhenius base?

What is the reduction half-reaction for the following overall galvanic cell reaction? Co2+(aq) + 2Ag(s) → Co(s) + 2 Ag+(aq)

Which of the following compounds is an Arrhenius base?

Which pair of compounds is soluble in water?

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients? ________ C3H6O(l) + ________ O2(g) → ________ CO2(g) + ________ H2O(l)

Which of the following compounds is an Arrhenius base?

H Br , H I , H NO3, Na Br , and KNO3 are all classified as ________.

Which of the following solutions will have the highest electrical conductivity?

Which of the compounds of H₂C₂O_4, Ca(OH) ₂, KOH, and H I behave as acids when they are dissolved in water?

How many H⁺ ions can the acid H₂SO₄ donate per molecule?

What reagent could not be used to separate Br^- from CO₃^2- when added to an aqueous solution containing both?

What reagent could be used to separate Br^- from CH₃CO₂^-when added to an aqueous solution containing both?

What is the reduction half-reaction for the following overall galvanic cell reaction? Co²⁺(aq) + 2Ag(s) → Co(s) + 2 Ag⁺(aq)

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest, whole-number coefficients? C₃H₆O(l) + O₂(g) → CO₂(g) + H₂O(l)

HBr, H I, HNO₃, NaBr, and KNO₃ are all classified as ________.