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Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 1, Problem 24GQ
Textbook Problem
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Identify the following as either physical changes or chemical changes.

  1. (a) The desalination of sea water (separation of pure water from dissolved salts).
  2. (b) The formation of SO2 (an air pollutant) when coal containingsulfur is burned.
  3. (c) Silver tarnishes.
  4. (d) Iron is heated to red heat

(a)

Interpretation Introduction

Interpretation:

The given process has to be identified as physical or chemical change.

Concept introduction:

Physical change: A change in which the substance retains in form or state without altering in composition.  It is temporary and easily reversible.

Chemical change: A change in which the substance loses its identity and produces one or more new substances by change in its composition.  It is permanent and not easily reversible.

Explanation of Solution

Desalination of sea water: The thermal distillation process in which water is boiled and the steam is collected, leaving the salt behind...

(b)

Interpretation Introduction

Interpretation:

The given process has to be identified as physical or chemical change.

Concept introduction:

Physical change: A change in which the substance retains in form or state without altering in composition.  It is temporary and easily reversible.

Chemical change: A change in which the substance loses its identity and produces one or more new substances by change in its composition.  It is permanent and not easily reversible.

(c)

Interpretation Introduction

Interpretation:

The given process has to be identified as physical or chemical change.

Concept introduction:

Physical change: A change in which the substance retains in form or state without altering in composition.  It is temporary and easily reversible.

Chemical change: A change in which the substance loses its identity and produces one or more new substances by change in its composition.  It is permanent and not easily reversible.

(d)

Interpretation Introduction

Interpretation:

The given process has to be identified as physical or chemical change.

Concept introduction:

Physical change: A change in which the substance retains in form or state without altering in composition.  It is temporary and easily reversible.

Chemical change: A change in which the substance loses its identity and produces one or more new substances by change in its composition.  It is permanent and not easily reversible.

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Chapter 1 Solutions

Chemistry & Chemical Reactivity
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