Question

Question 1 (True/False Worth 2 points) (04.03 LC) When Pb and AlCl3 react together, lead (Pb) can replace aluminum (Al) in the compound because lead is lower on the activity series. True False Question 2(Multiple Choice Worth 4 points) (04.03 MC) Which of the following equations has the correct products and is balanced correctly for a reaction between Na3PO4 and KOH? Na3PO4 + 3KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction Na3PO4 + KOH → Na3OH + KPO4, because K increases in charge from 1+ to 3+ when it is replaced Na3PO4 + KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction Na3PO4 + KOH → Na3OH + K3PO4, because K increases in charge from 1+ to 3+ when it is replaced Question 3(Multiple Choice Worth 4 points) (04.03 LC) Which of the following is a single replacement reaction? Ba(OH)2 + H2SO4 → BaSO4 + 2H2O 2Mg + O2 → 2MgO H2O+ CO2 → H2CO3 Zn + H2SO4 → ZnSO4 + H2 Question 4(Multiple Choice Worth 4 points) (04.03 MC) Sodium metal reacts with water to produce hydrogen gas. What best describes this reaction? A single replacement reaction takes place because sodium is less reactive than hydroxide ions. A double replacement reaction takes place because sodium is less reactive than hydroxide ions. A double replacement reaction takes place because sodium is more reactive than hydrogen. A single replacement reaction takes place because sodium is more reactive than hydrogen. Question 5 (True/False Worth 2 points) (04.03 LC) A single replacement reaction is a reaction in which one element replaces a similar element within a compound. True False Question 6(Multiple Choice Worth 4 points) (04.03 MC) The table shows the nature of reactants and products formed in a certain type of chemical reaction. Nature of Reactants and Products Reactants Products Metal + Ionic compound Metal + Ionic compound Which of the following is true about the type of chemical reaction? It is a single replacement reaction, and the anions in the two ionic compounds are different. It is a single replacement reaction, and the cations in the two ionic compounds are different. It is a double replacement reaction, and the anions in the two ionic compounds are different. It is a double replacement reaction, and the cations in the two ionic compounds are different.

Answer 1

Answer:

For 1: The correct answer is false.

For 2: The correct answer is $Na_3PO_4+3KOH\rightarrow 3NaOH + K_3PO_4$, because K retains the same charge throughout the reaction.

For 3: The correct answer is $Zn+H_2SO_4\rightarrow ZnSO_4 + H_2$

For 4: The correct answer is a single replacement reaction takes place because sodium is more reactive than hydrogen.

For 5: The correct answer is False.

For 6: The correct answer is it is a single replacement reaction, and the cations in the two ionic compounds are different.

Explanation:

• For 1:

This type or reaction is based on the reactivity series. If the metal which lies above in the series will replace the metal which lies below in the series easily.

From the reactivity table attached below, we know that lead lies below in the series to Aluminium and hence, it will not replace in the reaction.

$Pb+AlCl_3\rightarrow \text{No reaction}$

Hence, the correct answer is False.

• For 2:

A balanced equation is defined as the equation in which there are same number of atoms present on the reactant side and the product side.

The balanced equation always follow Law of Conservation of Mass.

So, from the given options, the below equation is the balanced equation because K retains the same charge throughout the reaction.

$Na_3PO_4+3KOH\rightarrow 3NaOH + K_3PO_4$

• For 3:

A single displacement reaction is a type of chemical reaction in which one element replaces another element in a chemical reaction. The element which is more reactive will replace the less less reactive element.

This is explained by reactivity series as the metal which lies above in the series will replace the metal which lies below in the series easily. From the given equations, the equation which is a type of single displacement reaction is:

$Zn+H_2SO_4\rightarrow ZnSO_4 + H_2$

$Ba(OH)_2+H_2SO_4\rightarrow BaSO_4 + 2H_2O$ : This equation is a type of double displacement reaction.

$2Mg+O_2\rightarrow 2MgO$  : This equation is a type of combination reaction.

$H_2O+CO_2\rightarrow H_2CO_3$ : This equation is a type of combination reaction.

• For 4:

A single displacement reaction is a type of chemical reaction in which one element replaces another element in a chemical reaction.

$A+BC\rightarrow AC+B$

A double displacement reaction is a type of chemical reaction in which exchange of ins takes place.

$AB+CD\rightarrow AD+BC$

In the question, it is asked that sodium metal is reacting with water to produce hydrogen gas and sodium hydroxide. This reaction is a type of single displacement reaction because sodium is more reactive than hydrogen as shown in the reactivity series.

$2Na+2H_2O\rightarrow H_2+2NaOH$

• For 5:

A single displacement reaction is a type of chemical reaction in which one element replaces another element in a chemical reaction. This reaction will not follow when an element replaces similar element.

Hence, the statement is False.

• For 6:

For the reaction:

$\text{Metal + Ionic compound}\rightarrow \text{Metal + Ionic compound}$

It is a type single replacement reaction as the cations in the two ionic compounds are different.

For Example:

$3Na+AlCl_3\rightarrow 3NaCl+Al$

Where, Sodium and Aluminium are the cations and chlorine is an anion.

Answer 2

1) Answer is: False.

Balanced chemical reaction: Pb + AlCl₃ → no reaction.

The reactivity series is a series of metals from highest to lowest reactivity. Metal higher in the reactivity series will displace another.  

Aluminium (Al) is higher in activity series than lead (Pb).  

That means aluminium is stronger reducing agent than lead and gives electrons easier.  

This series are used to summarize information about the reactions of metals with acids or water, double displacement reactions (more reactive metals displace metals with lower reactivity) and the extraction of metals from their ores.

2) Answer is: Na3PO4 + 3KOH → 3NaOH + K3PO4, because K retains the same charge throughout the reaction.

This chemical reaction is double displacement reaction - cations (K⁺ and Na⁺) and anions (PO₄³⁻⁻ and OH⁻) of the two reactants switch places and form two new compounds.  

Na₃PO₄ is sodium phosphate.  

KOH is potassium hydroxide.  

NaOH is sodium hydroxide.  

K₃PO₄ is potassium phosphate.  

3) Answer is: Zn + H2SO4 → ZnSO4 + H2.

Single replacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.  

In this balanced chemical reaction zinc (Zn) replaces hydrogen (H).

Zinc changes oxidation number from 0 to +2 and hydrogen change oxidation number from +1 to 0.

4) Answer is: A single replacement reaction takes place because sodium is more reactive than hydrogen.

Balanced chemical reaction:  

2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g).

Single replacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.  

In this balanced chemical reaction sodium (Na) replaces hydrogen (H).

Sodium changes oxidation number from 0 to +1 and hydrogen change oxidation number from +1 to 0.

5) Answer is: False.

For example, balanced chemical reaction:

Mg + 2HCl → H₂ + MgCl₂.  

Reduction hald reaction: 2H⁺ + 2e⁻→ H₂.  

Oxidation half reaction: Mg⁰ → Mg²⁺ + 2e⁻.  

In this balanced chemical reaction magnesium (Mg) replaces hydrogen (H).

In this chemical reaction, magnesium lost two electrons (oxidation, change oxidation number from 0 to +2) and hydrogen gain that two electrons (reduction, change oxidation number from +1 to 0).  

6) Answer is: It is a single replacement reaction, and the cations in the two ionic compounds are different.

For example, balanced chemical reaction:  

Ba + MgSO₄ → BaSO₄(s) + Mg.  

In this balanced chemical reaction barium (Ba) replaces magnesium (Mg), because barium is higher at activity series.

Sulfate anion (SO₄²⁻) is the same in two ionic compounds, but cations (Mg²⁺ and Ba²⁺) changes.

Single Displacement is reaction where neutral element metal or nonmetal become an ion as it replaces another ion in a compound.