Balanced chemical equation for production of lead metal from galena has to be written. Concept Introduction: Chemical reaction can be expressed in terms of chemical equation where the molecular formula and atomic symbols are used. As in a chemical reaction, there is a law of conservation of mass; the chemical equation has to be balanced. Balanced chemical equation is the one that has the same number of atoms of same kind on both sides of the equation.

Question

(A) if both sentences are true,(B) if both sentences are false,(C) if the first sentence is true but the second is false, and(D) if the first sentence is false but the second is true. 1. In a redox reaction, the oxidation number of iron changed from +2 to +3; thus, sulfur is a reducing agent. In a redox reaction, the oxidation number of nitrogen was unchanged; thus, nitrogen is an oxidant. 2. In a redox reaction, the reducing agent is oxidized and it gains electrons. In a redox reaction, the oxidizing agent is reduced and it gains electrons. 3. Bending stress is also known as flexural stress. The test used in observing the mechanical strength of chocolate is the three-point bend test. 4. The flexural strength of materials may be expressed in Pascals. Magnesium is more reactive than silver; therefore, magnesium corrodes faster than silver with the aid of air, oxygen, and sea water.

Answer 1

Question

Chapter 19, Problem 45QRT

(a)

Interpretation Introduction

Interpretation:

Balanced chemical equation for production of lead metal from galena has to be written.

Concept Introduction:

Chemical reaction can be expressed in terms of chemical equation where the molecular formula and atomic symbols are used. As in a chemical reaction, there is a law of conservation of mass; the chemical equation has to be balanced. Balanced chemical equation is the one that has the same number of atoms of same kind on both sides of the equation.

(b)

Interpretation Introduction

Interpretation:

The two reactions involved in the production of lead from galena have to be found as redox reactions or not and it has to be explained by identifying the oxidizing and reducing agent.

Concept Introduction:

Oxidizing agent is the one that gets reduced during a chemical reaction and reducing agent is the one that gets oxidized in a chemical reaction. In terms of electron transfer oxidizing agent is the one that donates electrons and reducing agent is the one that accepts electrons. In terms of oxidation number, the oxidizing agent is the one where the element gains electrons results in decrease of oxidation number and reducing agent is the one where the element loses electrons results in increase of oxidation number.

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(A) if both sentences are true,(B) if both sentences are false,(C) if the first sentence is true but the second is false, and(D) if the first sentence is false but the second is true. 1. In a redox reaction, the oxidation number of iron changed from +2 to +3; thus, sulfur is a reducing agent. In a redox reaction, the oxidation number of nitrogen was unchanged; thus, nitrogen is an oxidant. 2. In a redox reaction, the reducing agent is oxidized and it gains electrons. In a redox reaction, the oxidizing agent is reduced and it gains electrons. 3. Bending stress is also known as flexural stress. The test used in observing the mechanical strength of chocolate is the three-point bend test. 4. The flexural strength of materials may be expressed in Pascals. Magnesium is more reactive than silver; therefore, magnesium corrodes faster than silver with the aid of air, oxygen, and sea water.

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