Question 1

Which of these metals is the most easily oxidized?
Cu
Au
Pt
Li
Hg

Accepted Answer

Li has the lowest ionization energy among the given options which means it readily loses electrons to form cations and get oxidized. Thus it is the most easily oxidized metal in the list.

Question 2

A neutralization reaction between an acid and a metal hydroxide produces ________.

Accepted Answer

In a neutralization reaction, an acid reacts with a metal hydroxide to produce water and a salt. The salt is made up of the metal cation from the hydroxide and the anion from the acid. Therefore, choice A is the correct answer.

Question 3

What are the respective concentrations (M)of Na⁺ and SO₄^2-afforded by dissolving 0.500 mol Na₂SO₄in water and diluting to 1.33 L?

Accepted Answer

Dissolving 0.500 mol of Na2SO4 in water and diluting to 1.33 L results in a concentration of Na+ ions of (0.500 mol * 2) / 1.33 L = 0.752 M, because each formula unit of Na2SO4 produces two Na+ ions. The concentration of SO42- ions is (0.500 mol) / 1.33 L = 0.376 M, because each formula unit produces one SO42- ion.

Question 4

The spectator ions in the reaction between aqueous hydrobromic acid and aqueous sodium hydroxide are ________.

Accepted Answer

Spectator ions are ions that do not participate in the chemical reaction and remain in solution unchanged. In the reaction between hydrobromic acid (HBr) and sodium hydroxide (NaOH), the products are water (H2O) and sodium bromide (NaBr). The ions that do not change during the reaction are Br^- and Na^+, making them the spectator ions.

Question 5

The spectator ions in the reaction between aqueous hydrobromic acid and aqueous ammonia are ________.

Accepted Answer

The only two ions that are actually involved in the reaction are the H+ ion from hydrobromic acid and the NH3 molecule from ammonia. These react to form NH4+ and the Br- ion is just a spectator ion that remains in solution and does not participate in the reaction. Therefore, the only spectator ion present is Br-.

Question 6

Which species is oxidized in the reaction below? Au(s)+ 3NO₃^-(aq)+ 6H⁺(aq)→ Au³⁺(aq)+ NO(g)+ 3H₂O (l) H⁺ N⁺⁵ O^2- H₂O Au

Accepted Answer

Au is the only element that appears in its elemental state in the reaction, meaning it is undergoing oxidation.

Question 7

Of the metals below,which will dissolve in an aqueous solution containing nickel ion?
Aluminum
Chromium
Barium
Tin
Potassium

Accepted Answer

The answer of Of the metals below,which will dissolve in...

Question 8

What are the respective concentrations (M)of K⁺ and CO₃^2- afforded by dissolving 0.530 mol K₂CO₃ in water and diluting to 1.50 L?

Accepted Answer

First, let's write out the balanced chemical equation: K₂CO₃ + H2O -> K⁺ + CO₃^2- From the equation, we can see that one mole of K₂CO₃ produces one mole of each of the two products. Therefore, since we have 0.530 mol of the starting compound and we are diluting to a total volume of 1.50 L, the molarity of each product is: Molarity of K⁺ = (0.530 mol / 1.50 L) = 0.353 M Molarity of CO₃^2- = (0.530 mol / 1.50 L) = 0.353 M Therefore, the answer is (A) 0.707 and 0.353.

Question 9

Of the following elements,________ is the least easily oxidized. sodium
Calcium
Hydrogen
Gold
Platinum

Accepted Answer

Gold is the least easily oxidized because it is a noble metal.

Question 10

Which of the following are strong acids? HI HNO₃ HF HBr

Accepted Answer

HI, HNO3, and HBr are strong acids. HF is not a strong acid; it is a weak acid.

Question 11

How many moles of Na⁺ are present in 343 mL of a 1.27 M solution of Na₂SO₄?

Accepted Answer

To find the number of moles of Na⁺ in the solution, use the formula: moles = molarity × volume (in liters). Given a molarity of 1.27 M and a volume of 343 mL (which is 0.343 L), the calculation is 1.27 M × 0.343 L = 0.43541 moles, which rounds to 0.436, but since the choice is not present, the closest provided option is 0.871.

Question 12

How many moles of K⁺ are present in 343 mL of a 1.27 M solution of K₃PO₄?

Accepted Answer

The molarity (M) of the solution is 1.27 M, meaning there are 1.27 moles of K₃PO₄ per liter. In 343 mL (0.343 L), there are 0.343 L * 1.27 mol/L = 0.436 moles of K₃PO₄. Each K₃PO₄ contains 3 moles of K⁺, so there are 0.436 moles * 3 = 1.31 moles of K⁺.

Question 13

Of the following elements,________ is the most difficult to oxidize. Cu
Hg
Au
Ag
Na

Accepted Answer

Au (gold) has the highest standard reduction potential in the electrochemical series, which means it is the most difficult to oxidize and is the most noble metal. The other metals listed, Cu (copper), Hg (Mercury), Ag (Silver), and Na (Sodium) all have lower standard reduction potentials than Au and are therefore easier to oxidize.

Question 14

Which hydroxides are strong bases? Sr(OH)₂ KOH NaOH Ba(OH)₂

Accepted Answer

Strong bases include hydroxides of alkali metals (like KOH, NaOH) and heavy alkaline earth metals (like Sr(OH)2, Ba(OH)2), making all the listed hydroxides strong bases.

Question 15

What is the concentration (M)of a NaCl solution prepared by dissolving 9.3 g of NaCl in sufficient water to give 350 mL of solution?

Accepted Answer

First, convert the given mass of NaCl into moles:

9.3 g NaCl x (1 mol NaCl / 58.44 g NaCl) = 0.159 mol NaCl

Next, calculate the concentration in units of moles per liter (M):

0.159 mol NaCl / 0.350 L = 0.454 M

Round this to two significant figures and the answer is 0.45 M, which corresponds to choice C.

Question 16

Which of these metals is the least easily oxidized?
Na
Au
Fe
Ca
Ag

Accepted Answer

Au (Gold) is the least easily oxidized among the options given. This is because gold is a noble metal, known for its resistance to corrosion and oxidation.

Question 17

Based on the equations below,which metal is the most active? Pb(NO₃)₂ (aq)+ Ni (s)→ Ni(NO₃)₂ (aq)+ Pb (s) Pb(NO₃)₂ (aq)+ Ag (s)→ No reaction Cu(NO₃)₂ (aq)+ Ni (s)→ Ni(NO₃)₂ (aq)+ Cu (s)

Accepted Answer

Ni displaces both Pb and Cu from their compounds, indicating it is the most active metal among the options provided.

Question 18

How many moles of Co²⁺ are present in 0.200 L of a 0.400 M solution of CoI₂?

Accepted Answer

To find the moles of Co²⁺, use the formula: moles = molarity × volume. Here, moles = 0.400 M × 0.200 L = 0.0800 moles.

Question 19

Of the following elements,________ is the most easily oxidized. lithium
Zinc
Hydrogen
Aluminum
Gold

Accepted Answer

Lithium has a low ionization energy and a strong tendency to lose its outermost electron, making it the most easily oxidized element out of the options given.

Question 20

Calculate the concentration (M)of sodium ions in a solution made by diluting 50.0 mL of a 0.874 M solution of sodium sulfide to a total volume of 250.0 mL.

Accepted Answer

The concentration of sodium ions in the diluted solution can be calculated using the dilution formula $C_1V_1 = C_2V_2$, where $C_1$ and $V_1$ are the concentration and volume of the initial solution, and $C_2$ and $V_2$ are the concentration and volume of the diluted solution, respectively. Since sodium sulfide ($Na_2S$) dissociates into 2 sodium ions ($Na^+$) for every formula unit, the concentration of sodium ions in the original solution is $0.874 M \times 2 = 1.748 M$. Applying the dilution formula for the sodium ions: $1.748 M \times 50.0 mL = C_2 \times 250.0 mL$. Solving for $C_2$ gives $C_2 = 0.350 M$, which is the concentration of sodium ions in the diluted solution.

Quiz 4: Reactions in Aqueous Solution

Which of these metals is the most easily oxidized? Cu Au Pt Li Hg

A neutralization reaction between an acid and a metal hydroxide produces ________.

What are the respective concentrations (M) of Na⁺ and SO₄^2-afforded by dissolving 0.500 mol Na₂SO₄in water and diluting to 1.33 L?

The spectator ions in the reaction between aqueous hydrobromic acid and aqueous sodium hydroxide are ________.

The spectator ions in the reaction between aqueous hydrobromic acid and aqueous ammonia are ________.

Which species is oxidized in the reaction below? Au(s) + 3NO₃^-(aq) + 6H⁺(aq) → Au³⁺(aq) + NO(g) + 3H₂O (l) H⁺ N⁺⁵ O^2- H₂O Au

Of the metals below,which will dissolve in an aqueous solution containing nickel ion? Aluminum Chromium Barium Tin Potassium

What are the respective concentrations (M) of K⁺ and CO₃^2- afforded by dissolving 0.530 mol K₂CO₃ in water and diluting to 1.50 L?

Of the following elements,________ is the least easily oxidized. sodium Calcium Hydrogen Gold Platinum

Which of the following are strong acids? HI HNO₃ HF HBr

How many moles of Na⁺ are present in 343 mL of a 1.27 M solution of Na₂SO₄?

How many moles of K⁺ are present in 343 mL of a 1.27 M solution of K₃PO₄?

Of the following elements,________ is the most difficult to oxidize. Cu Hg Au Ag Na

Which hydroxides are strong bases? Sr(OH) ₂ KOH NaOH Ba(OH) ₂

What is the concentration (M) of a NaCl solution prepared by dissolving 9.3 g of NaCl in sufficient water to give 350 mL of solution?

Which of these metals is the least easily oxidized? Na Au Fe Ca Ag

Based on the equations below,which metal is the most active? Pb(NO₃) ₂ (aq) + Ni (s) → Ni(NO₃) ₂ (aq) + Pb (s) Pb(NO₃) ₂ (aq) + Ag (s) → No reaction Cu(NO₃) ₂ (aq) + Ni (s) → Ni(NO₃) ₂ (aq) + Cu (s)

How many moles of Co²⁺ are present in 0.200 L of a 0.400 M solution of CoI₂?

Of the following elements,________ is the most easily oxidized. lithium Zinc Hydrogen Aluminum Gold

Calculate the concentration (M) of sodium ions in a solution made by diluting 50.0 mL of a 0.874 M solution of sodium sulfide to a total volume of 250.0 mL.

Quiz 4: Reactions in Aqueous Solution

Which of these metals is the most easily oxidized? Cu Au Pt Li Hg

A neutralization reaction between an acid and a metal hydroxide produces ________.

What are the respective concentrations (M) of Na+ and SO42- afforded by dissolving 0.500 mol Na2SO4 in water and diluting to 1.33 L?

The spectator ions in the reaction between aqueous hydrobromic acid and aqueous sodium hydroxide are ________.

The spectator ions in the reaction between aqueous hydrobromic acid and aqueous ammonia are ________.

Which species is oxidized in the reaction below? Au(s) + 3NO3-(aq) + 6H+(aq) → Au3+(aq) + NO(g) + 3H2O (l) H+ N+5 O2- H2O Au

Of the metals below,which will dissolve in an aqueous solution containing nickel ion? Aluminum Chromium Barium Tin Potassium

What are the respective concentrations (M) of K+ and CO32- afforded by dissolving 0.530 mol K2CO3 in water and diluting to 1.50 L?

Of the following elements,________ is the least easily oxidized. sodium Calcium Hydrogen Gold Platinum

Which of the following are strong acids? HI HNO3 HF HBr

How many moles of Na+ are present in 343 mL of a 1.27 M solution of Na2SO4?

How many moles of K+ are present in 343 mL of a 1.27 M solution of K3PO4?

Of the following elements,________ is the most difficult to oxidize. Cu Hg Au Ag Na

Which hydroxides are strong bases? Sr(OH) 2 KOH NaOH Ba(OH) 2

What is the concentration (M) of a NaCl solution prepared by dissolving 9.3 g of NaCl in sufficient water to give 350 mL of solution?

Which of these metals is the least easily oxidized? Na Au Fe Ca Ag

Based on the equations below,which metal is the most active? Pb(NO3) 2 (aq) + Ni (s) → Ni(NO3) 2 (aq) + Pb (s) Pb(NO3) 2 (aq) + Ag (s) → No reaction Cu(NO3) 2 (aq) + Ni (s) → Ni(NO3) 2 (aq) + Cu (s)

How many moles of Co2+ are present in 0.200 L of a 0.400 M solution of CoI2?

Of the following elements,________ is the most easily oxidized. lithium Zinc Hydrogen Aluminum Gold

Calculate the concentration (M) of sodium ions in a solution made by diluting 50.0 mL of a 0.874 M solution of sodium sulfide to a total volume of 250.0 mL.

What are the respective concentrations (M) of Na⁺ and SO₄^2-afforded by dissolving 0.500 mol Na₂SO₄in water and diluting to 1.33 L?

Which species is oxidized in the reaction below? Au(s) + 3NO₃^-(aq) + 6H⁺(aq) → Au³⁺(aq) + NO(g) + 3H₂O (l) H⁺ N⁺⁵ O^2- H₂O Au

What are the respective concentrations (M) of K⁺ and CO₃^2- afforded by dissolving 0.530 mol K₂CO₃ in water and diluting to 1.50 L?

Which of the following are strong acids? HI HNO₃ HF HBr

How many moles of Na⁺ are present in 343 mL of a 1.27 M solution of Na₂SO₄?

How many moles of K⁺ are present in 343 mL of a 1.27 M solution of K₃PO₄?

Which hydroxides are strong bases? Sr(OH) ₂ KOH NaOH Ba(OH) ₂

Based on the equations below,which metal is the most active? Pb(NO₃) ₂ (aq) + Ni (s) → Ni(NO₃) ₂ (aq) + Pb (s) Pb(NO₃) ₂ (aq) + Ag (s) → No reaction Cu(NO₃) ₂ (aq) + Ni (s) → Ni(NO₃) ₂ (aq) + Cu (s)

How many moles of Co²⁺ are present in 0.200 L of a 0.400 M solution of CoI₂?