Question 1

Determine the oxidation state of Sn in Sn(SO₄)₂.

Accepted Answer

In the given compound, the sum of oxidation states of all atoms must be equal to zero as the compound is neutral.

Let's assume the oxidation state of sulfur (S) to be -2 (most common) and oxygen (O) to be -2.

Then, we can write the compound as Sn(SO4)2, where the oxidation state of Sn can be calculated as follows:

(+x) + (2×-2) + 2(-2) = 0
x - 4 - 4 = 0
x = +8

Therefore, the oxidation state of Sn in the given compound is +4, which corresponds to option B.

Question 2

Give the net ionic equation for the reaction (if any)that occurs when aqueous solutions of Al(C₂H₃O₂)₃ and LiNO₃ are mixed.

Accepted Answer

When Al(C2H3O2)3 and LiNO3 are mixed in aqueous solution, no precipitation, gas formation, or weak electrolyte formation occurs, so no net ionic reaction takes place.

Question 3

Give the net ionic equation for the reaction (if any)that occurs when aqueous solutions of H₂SO₄ and KOH are mixed.

Accepted Answer

When H₂SO₄ and KOH are mixed, they undergo a neutralization reaction where H⁺ ions from H₂SO₄ react with OH⁻ ions from KOH to form water, H₂O. The net ionic equation for this reaction is H⁺(aq) + OH⁻(aq) → H₂O(l).

Question 4

Which of the following is a gas-evolution reaction?

Accepted Answer

In reaction D, NH₃ gas is evolved as a product, making it a gas-evolution reaction.

Question 5

The titration of 25.0 mL of an unknown concentration H₂SO₄ solution requires 83.6 mL of 0.12 M LiOH solution.What is the concentration of the H₂SO₄ solution (in M)?

Accepted Answer

The concentration of the unknown solution can be found using the titration formula: $M_1V_1 = M_2V_2$, where $M_1$ and $M_2$ are the molarities of the two solutions, and $V_1$ and $V_2$ are their volumes. Given $M_2 = 0.12 \, M$, $V_2 = 83.6 \, mL$, and $V_1 = 25.0 \, mL$, we can solve for $M_1$: $M_1 = \frac{M_2V_2}{V_1} = \frac{0.12 \, M \times 83.6 \, mL}{25.0 \, mL} = 0.40128 \, M$, which rounds to $0.40 \, M$, making choice B correct.

Question 6

Match the following. -CH₄(g)+ 2 O₂(g)→ CO₂(g)+ 2 H₂O(g)

Accepted Answer

The answer of Match the following. -CH₄(g)+ 2 O₂(g)→ CO₂(g)+ 2...

Question 7

Which of the following is an acid base reaction?

Accepted Answer

This is an acid-base neutralization reaction between the strong acid HCl and the strong base Ca(OH)2, producing water and a salt (CaCl2). The other reactions do not involve the transfer of a proton between an acid and a base, and thus are not acid-base reactions.

Question 8

Determine the oxidation state of P in PO₃^3-.

Accepted Answer

The given formula seems to be a non-standard representation of a chemical species. However, assuming standard oxidation states for oxygen (O = -2) and sulfur (S = -2), and knowing that the sum of oxidation states in a neutral compound must equal zero, we can deduce the oxidation state of phosphorus (P). In compounds, phosphorus can exhibit various oxidation states, but +3 and +5 are common. Given the context and the options provided, +3 is the correct choice for the oxidation state of phosphorus in this compound.

Question 9

What element is undergoing reduction (if any)in the following reaction? Zn(s)+ 2 AgNO₃(aq)→ Zn(NO₃)₂(aq)+ 2 Ag(s)

Accepted Answer

Ag is undergoing reduction because it gains electrons, going from Ag+ in AgNO3 to Ag(s) in the products.

Question 10

Determine the reducing agent in the following reaction. 2 Li(s)+ Fe(C₂H₃O₂)₂(aq)→ 2 LiC₂H₃O₂(aq)+ Fe(s)

Accepted Answer

Lithium (Li) is the reducing agent because it loses electrons (is oxidized) to reduce the iron compound, resulting in lithium ions in the product.

Question 11

Give the net ionic equation for the reaction (if any)that occurs when aqueous solutions of Na₂CO₃ and HCl are mixed.

Accepted Answer

When Na2CO3 and HCl are mixed, the carbonate ion (CO3^2-) reacts with hydrogen ions (H+) to form carbonic acid (H2CO3), which decomposes into water (H2O) and carbon dioxide (CO2) gas.

Question 12

Give the net ionic equation for the reaction (if any)that occurs when aqueous solutions of K₂S and Fe(NO₃)₂ are mixed.

Accepted Answer

The net ionic equation for the reaction between aqueous solutions of K2S and Fe(NO3)2 involves the formation of FeS (solid) from Fe^2+ and S^2- ions, with potassium and nitrate ions remaining in solution as spectator ions.

Question 13

Give the oxidation state for S in SO₃^-2.

Accepted Answer

In SO₃²⁻, the total charge is -2. Oxygen typically has an oxidation state of -2. With three oxygens, the total is -6. To balance this with the -2 charge, sulfur must have an oxidation state of +4.

Question 14

The titration of 80.0 mL of an unknown concentration H₃PO₄ solution requires 126 mL of 0.218 M KOH solution.What is the concentration of the H₃PO₄ solution (in M)?

Accepted Answer

The answer of The titration of 80.0 mL of an...

Question 15

What element is undergoing oxidation (if any)in the following reaction? CH₄(g)+ 2 O₂(g)→ CO₂(g)+ 2 H₂O(g)

Accepted Answer

The answer of What element is undergoing oxidation (if any)in...

Question 16

Choose the reaction that represents the combustion of C₆H₁₂O₂.

Accepted Answer

Combustion is a reaction with oxygen that releases energy. The correct answer is A because it shows C6H12O2 reacting with oxygen to produce carbon dioxide and water, which is a combustion reaction.

Question 17

Give the complete ionic equation for the reaction (if any)that occurs when aqueous solutions of MgSO₃ and HI are mixed.

Accepted Answer

When MgSO₃ and HI are mixed, the H⁺ ions from HI react with SO₃²⁻ ions to form H₂O and SO₂ gas, which is a decomposition reaction of sulfurous acid (H₂SO₃).

Question 18

Determine the oxidation state of Cl in NaClO₃.

Accepted Answer

In NaClO₃, sodium (Na) has an oxidation state of +1 and oxygen (O) has an oxidation state of -2. The compound is neutral, so the sum of oxidation states must be zero. Let x be the oxidation state of Cl. Thus, +1 + x + 3(-2) = 0, solving gives x = +5.

Question 19

Which of the following is an oxidation-reduction reaction?

Accepted Answer

In reaction D, magnesium (Mg) is oxidized to Mg²⁺, and hydrogen ions (H⁺) are reduced to hydrogen gas (H₂), indicating an oxidation-reduction reaction.

Question 20

Determine the oxidizing agent in the following reaction. Ni(s)+ 2 AgClO₄(aq)→ Ni(ClO₄)₂(aq)+ 2 Ag(s)

Accepted Answer

In the given reaction, Ag goes from a positive oxidation state of +1 in AgClO4 to a neutral state in Ag, indicating that it has been reduced. Therefore, Ag is the oxidizing agent.

Quiz 4: Chemical Quantities and Aqueous Reactions

Determine the oxidation state of Sn in Sn(SO₄) ₂.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Al(C₂H₃O₂) ₃ and LiNO₃ are mixed.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of H₂SO₄ and KOH are mixed.

Which of the following is a gas-evolution reaction?

The titration of 25.0 mL of an unknown concentration H₂SO₄ solution requires 83.6 mL of 0.12 M LiOH solution.What is the concentration of the H₂SO₄ solution (in M) ?

Match the following. -CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

Which of the following is an acid base reaction?

Determine the oxidation state of P in PO₃^3-.

What element is undergoing reduction (if any) in the following reaction? Zn(s) + 2 AgNO₃(aq) → Zn(NO₃) ₂(aq) + 2 Ag(s)

Determine the reducing agent in the following reaction. 2 Li(s) + Fe(C₂H₃O₂) ₂(aq) → 2 LiC₂H₃O₂(aq) + Fe(s)

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na₂CO₃ and HCl are mixed.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K₂S and Fe(NO₃) ₂ are mixed.

Give the oxidation state for S in SO₃^-2.

The titration of 80.0 mL of an unknown concentration H₃PO₄ solution requires 126 mL of 0.218 M KOH solution.What is the concentration of the H₃PO₄ solution (in M) ?

What element is undergoing oxidation (if any) in the following reaction? CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

Choose the reaction that represents the combustion of C₆H₁₂O₂.

Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO₃ and HI are mixed.

Determine the oxidation state of Cl in NaClO₃.

Which of the following is an oxidation-reduction reaction?

Determine the oxidizing agent in the following reaction. Ni(s) + 2 AgClO₄(aq) → Ni(ClO₄) ₂(aq) + 2 Ag(s)

Quiz 4: Chemical Quantities and Aqueous Reactions

Determine the oxidation state of Sn in Sn(SO4) 2.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Al(C2H3O2) 3 and LiNO3 are mixed.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of H2SO4 and KOH are mixed.

Which of the following is a gas-evolution reaction?

The titration of 25.0 mL of an unknown concentration H2SO4 solution requires 83.6 mL of 0.12 M LiOH solution.What is the concentration of the H2SO4 solution (in M) ?

Match the following. -CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)

Which of the following is an acid base reaction?

Determine the oxidation state of P in PO33-.

What element is undergoing reduction (if any) in the following reaction? Zn(s) + 2 AgNO3(aq) → Zn(NO3) 2(aq) + 2 Ag(s)

Determine the reducing agent in the following reaction. 2 Li(s) + Fe(C2H3O2) 2(aq) → 2 LiC2H3O2(aq) + Fe(s)

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na2CO3 and HCl are mixed.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K2S and Fe(NO3) 2 are mixed.

Give the oxidation state for S in SO3-2.

The titration of 80.0 mL of an unknown concentration H3PO4 solution requires 126 mL of 0.218 M KOH solution.What is the concentration of the H3PO4 solution (in M) ?

What element is undergoing oxidation (if any) in the following reaction? CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)

Choose the reaction that represents the combustion of C6H12O2.

Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO3 and HI are mixed.

Determine the oxidation state of Cl in NaClO3.

Which of the following is an oxidation-reduction reaction?

Determine the oxidizing agent in the following reaction. Ni(s) + 2 AgClO4(aq) → Ni(ClO4) 2(aq) + 2 Ag(s)

Determine the oxidation state of Sn in Sn(SO₄) ₂.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Al(C₂H₃O₂) ₃ and LiNO₃ are mixed.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of H₂SO₄ and KOH are mixed.

The titration of 25.0 mL of an unknown concentration H₂SO₄ solution requires 83.6 mL of 0.12 M LiOH solution.What is the concentration of the H₂SO₄ solution (in M) ?

Match the following. -CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

Determine the oxidation state of P in PO₃^3-.

What element is undergoing reduction (if any) in the following reaction? Zn(s) + 2 AgNO₃(aq) → Zn(NO₃) ₂(aq) + 2 Ag(s)

Determine the reducing agent in the following reaction. 2 Li(s) + Fe(C₂H₃O₂) ₂(aq) → 2 LiC₂H₃O₂(aq) + Fe(s)

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of Na₂CO₃ and HCl are mixed.

Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K₂S and Fe(NO₃) ₂ are mixed.

Give the oxidation state for S in SO₃^-2.

The titration of 80.0 mL of an unknown concentration H₃PO₄ solution requires 126 mL of 0.218 M KOH solution.What is the concentration of the H₃PO₄ solution (in M) ?

What element is undergoing oxidation (if any) in the following reaction? CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g)

Choose the reaction that represents the combustion of C₆H₁₂O₂.

Give the complete ionic equation for the reaction (if any) that occurs when aqueous solutions of MgSO₃ and HI are mixed.

Determine the oxidation state of Cl in NaClO₃.

Determine the oxidizing agent in the following reaction. Ni(s) + 2 AgClO₄(aq) → Ni(ClO₄) ₂(aq) + 2 Ag(s)