Question 1

In which reaction does the oxidation number of hydrogen change?

Accepted Answer

In reaction B, hydrogen goes from being part of a molecule (H2O) where it has an oxidation state of +1 to forming H2 gas, where its oxidation state is 0. This change in oxidation state indicates a change in the oxidation number of hydrogen.

Question 2

Which of these metals will be oxidized by the ions of cobalt?

Accepted Answer

Iron is oxidized by the ions of cobalt because iron is more reactive than cobalt.

Question 3

Which of the following are weak acids?

Accepted Answer

HF (hydrofluoric acid) is a weak acid because it does not completely dissociate in water, unlike the other halogen acids (HCl, HBr, HI) which are strong acids.

Question 4

The balanced reaction between aqueous potassium hydroxide and aqueous acetic acid is ________.

Accepted Answer

The balanced reaction between aqueous potassium hydroxide and aqueous acetic acid is:

KOH(aq) + HC2H3O2(aq) → H2O(l) + KC2H3O2(aq)

Option B is the only choice that has the correct chemical formula for acetic acid (HC2H3O2) and the correct chemical formula for potassium acetate (KC2H3O2) in the products. The other options have incorrect chemical formulas for one or both of these compounds.

Question 5

A compound was found to be soluble in water. It was also found that addition of acid to an aqueous solution of this compound resulted in the formation of carbon dioxide.Which one of the following cations would form a precipitate when added to an aqueous solution of this compound?

Accepted Answer

The formation of carbon dioxide indicates the presence of carbonate ions (CO32-). Only metal cations that form insoluble carbonates will form a precipitate when added to the solution. Among the given options, Cr3+ is the only metal cation that forms an insoluble carbonate. Therefore, option C (Cr3+) would form a precipitate in the solution.

Question 6

One method for removal of metal ions from a solution is to convert the metal to its elemental form so it can be filtered out as a solid. Which metal can be used to remove aluminum ions from solution?

Accepted Answer

Aluminum is more reactive than zinc, cobalt, lead, and copper, so none of these metals can reduce aluminum ions to elemental aluminum.

Question 7

The process by which metal in the presence of air and water is converted into rust is known as ________.

Accepted Answer

Corrosion is the process by which metal in the presence of air and water is converted into rust. Activities refer to a wide range of actions or behaviors, reduction is a chemical reaction where electrons are gained, metathesis is a type of chemical reaction where the cations and anions exchange places, and decomposition is the breakdown of complex molecules into simpler ones.

Question 8

In which reaction does the oxidation number of oxygen increase?

Accepted Answer

The answer of In which reaction does the oxidation number...

Question 9

Which compound has the atom with the highest oxidation number?

Accepted Answer

In MgSO3, sulfur has the highest oxidation number of +4.

Question 10

Based on the activity series,which one of the reactions below will occur?

Accepted Answer

According to the activity series, lead (Pb) is more reactive than silver (Ag), which means lead can displace silver from its nitrate solution.

Question 11

Oxidation cannot occur without ________.

Accepted Answer

Oxidation and reduction are complementary processes that always occur together. When a substance undergoes oxidation, it loses electrons, and another substance must gain those electrons, undergoing reduction. This is summarized in the concept of redox reactions, where "redox" is a portmanteau of reduction and oxidation. The presence of acid, oxygen, water, or air is not a necessary condition for oxidation to occur, but the simultaneous occurrence of reduction is.

Question 12

Of the choices below,which would be the best for the lining of a tank intended for use in storage of hydrochloric acid?

Accepted Answer

The answer of Of the choices below,which would be the...

Question 13

The net ionic equation for the dissolution of zinc metal in aqueous hydrobromic acid is ________.

Accepted Answer

The net ionic equation involves only the species that undergo a change. Zinc metal reacts with hydrogen ions to form zinc ions and hydrogen gas.

Question 14

Which of the following reactions is not spontaneous?

Accepted Answer

Copper (Cu) does not react with hydrochloric acid (HCl) under normal conditions because copper is less reactive than hydrogen and cannot displace hydrogen from HCl.

Question 15

Zinc is more active than cobalt and iron but less active than aluminum.Cobalt is more active than nickel but less active than iron.Which of the following correctly lists the elements in order of increasing activity?

Accepted Answer

According to the given information, the order of increasing activity is: Ni < Co < Fe < Zn < Al. Choice A and B have incorrect orders, while choice D and E have incorrect starting points. Therefore, the correct choice is C.

Question 16

Sodium does not occur in nature as Na (s)because ________.

Accepted Answer

Sodium readily reacts with oxygen in the air to form sodium oxide (Na2O), which then reacts with water to form sodium hydroxide (NaOH). This means that pure sodium metal is difficult to obtain and is usually produced through electrolysis of sodium compounds, such as sodium chloride (NaCl). When exposed to air, sodium metal can also react to form a mixture of Na2O and Na2O2, which are both oxidized forms of sodium (Na). Therefore, pure elemental sodium does not occur in nature as Na (s).

Question 17

Based on the activity series,which one of the reactions below will occur?

Accepted Answer

Manganese (Mn) is more reactive than nickel (Ni) according to the activity series, so it can displace nickel from nickel(II) chloride (NiCl2) solution.

Question 18

Oxidation is the ________ and reduction is the ________.

Accepted Answer

The answer of Oxidation is the ________ and reduction is...

Question 19

Which of these metals will be oxidized by the ions of aluminum?

Accepted Answer

The position of aluminum in the electrochemical series is above magnesium, zinc, chromium, iron, and nickel. This means that aluminum can oxidize all of these metals. However, when a metal is oxidized, it loses electrons and becomes a cation. The cation formed by magnesium is Mg2+, by zinc is Zn2+, and so on. Since aluminum has a +3 charge as an ion, it can oxidize metals that have a lower charge, like Mg2+ and Zn2+, but not those that have a higher charge like Cr3+, Fe2+, or Ni2+. Therefore, the best choice is A) magnesium.

Question 20

The balanced reaction between aqueous nitric acid and aqueous strontium hydroxide is ________.

Accepted Answer

The balanced chemical equation for the reaction between nitric acid (HNO3) and strontium hydroxide (Sr(OH)2) is D) 2HNO3 (aq) + Sr(OH)2 (aq) → 2H2O (l) + Sr(NO3)2 (aq). This equation shows that two moles of nitric acid react with one mole of strontium hydroxide to produce two moles of water and one mole of strontium nitrate, following the principles of acid-base neutralization.

Quiz 4: Reactions in Aqueous Solution

In which reaction does the oxidation number of hydrogen change?

Which of these metals will be oxidized by the ions of cobalt?

Which of the following are weak acids?

The balanced reaction between aqueous potassium hydroxide and aqueous acetic acid is ________.

A compound was found to be soluble in water. It was also found that addition of acid to an aqueous solution of this compound resulted in the formation of carbon dioxide.Which one of the following cations would form a precipitate when added to an aqueous solution of this compound?

One method for removal of metal ions from a solution is to convert the metal to its elemental form so it can be filtered out as a solid. Which metal can be used to remove aluminum ions from solution?

The process by which metal in the presence of air and water is converted into rust is known as ________.

In which reaction does the oxidation number of oxygen increase?

Which compound has the atom with the highest oxidation number?

Based on the activity series,which one of the reactions below will occur?

Oxidation cannot occur without ________.

Of the choices below,which would be the best for the lining of a tank intended for use in storage of hydrochloric acid?

The net ionic equation for the dissolution of zinc metal in aqueous hydrobromic acid is ________.

Which of the following reactions is not spontaneous?

Zinc is more active than cobalt and iron but less active than aluminum.Cobalt is more active than nickel but less active than iron.Which of the following correctly lists the elements in order of increasing activity?

Sodium does not occur in nature as Na (s) because ________.

Based on the activity series,which one of the reactions below will occur?

Oxidation is the and reduction is the .

Which of these metals will be oxidized by the ions of aluminum?

The balanced reaction between aqueous nitric acid and aqueous strontium hydroxide is ________.