Photogray lenses contain small embedded crystals of solid silver chloride. Silver chloride is light-sensitive because of the reaction AgCl ( s ) → h v Ag ( s ) + Cl Small particles of metallic silver cause the lenses to darken. In the lenses this process is reversible. When the light is removed, the reverse reaction occurs. However, when pure white silver chloride is exposed to sunlight it darkens; the reverse reaction does not occur in the dark. a. How do you explain this difference? b. Photogray lenses do become permanently dark in time. How do you account for this?

Q: Expert Answer

(a) Interpretation Introduction Interpretation: Some facts about photography lens are given. The answers are to be stated as per the given conditions. Concept introduction: Photography lenses contain silver chloride. Silver chloride is light sensitive. To determine: The explanation for the difference in the fact that, when the light is removed from the decomposition reaction of white silver chloride, the reverse reaction occurs but when pure white silver chloride is exposed to sunlight it darkens and the reverse reaction does not occur in the dark. Explanation When the light is removed from the decomposition reaction of white silver chloride, the reverse reaction occurs but when pure white silver chloride is exposed to sunlight it darkens and the reverse reaction does not occur because chlorine atoms escape in the dark from the pure AgCl . The stated reaction is, AgCl ( s ) → h ν Ag ( s (b) Interpretation Introduction Interpretation: Some facts about photography lens are given. The answers are to be stated as per the given conditions. Concept introduction: Photography lenses contain silver chloride. Silver chloride is light sensitive. To determine: An explanation for the reason that, photography lenses do become permanently dark in time.

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Answer 1

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Chemistry: An Atoms First Approach

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Steven S. Zumdahl + 1 other

Publisher: Cengage Learning

ISBN: 9781305079243

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BuyFind

Chemistry: An Atoms First Approach

2nd Edition

Steven S. Zumdahl + 1 other

Publisher: Cengage Learning

ISBN: 9781305079243

Solutions

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Section

Answer 3

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Answer 4

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Answer 5

(a)

Interpretation Introduction

Interpretation: Some facts about photography lens are given. The answers are to be stated as per the given conditions.

Concept introduction: Photography lenses contain silver chloride. Silver chloride is light sensitive.

To determine: The explanation for the difference in the fact that, when the light is removed from the decomposition reaction of white silver chloride, the reverse reaction occurs but when pure white silver chloride is exposed to sunlight it darkens and the reverse reaction does not occur in the dark.

Explanation of Solution

When the light is removed from the decomposition reaction of white silver chloride, the reverse reaction occurs but when pure white silver chloride is exposed to sunlight it darkens and the reverse reaction does not occur because chlorine atoms escape in the dark from the pure AgCl .

The stated reaction is,

AgCl(s)→hνAg(s

Answer 6

(b)

Interpretation Introduction

Interpretation: Some facts about photography lens are given. The answers are to be stated as per the given conditions.

Concept introduction: Photography lenses contain silver chloride. Silver chloride is light sensitive.

To determine: An explanation for the reason that, photography lenses do become permanently dark in time.

Chemistry: An Atoms First Approach

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Chemistry: An Atoms First Approach

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