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Chemistry & Chemical Reactivity

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

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 1.7, Problem 1RC
Textbook Problem
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When camping in the mountains, you boil a pot of water on a campfire to make tea. Which of the following is a chemical change?

  1. (a) The water boils.
  2. (b) The campfire wood burns.
  3. (c) The tea dissolves in the hot water.
  4. (d) The pot melts from the heat of the fire.

Interpretation Introduction

Interpretation: Among the given following, the chemical change process to be identified.

Concept introduction:

Physical change: Changes in physical properties are called physical changes. The identity of a substance is preserved even though it may have changed its physical state or the shape.

Chemical change: During a chemical change, in which one or more substances are transformed into one or more different substances.

Explanation of Solution

Reason for correct option:

b) While burning of wood the new substances like water, carbon-dioxide and other gas products are formed which all these cannot be retrieved into the original substance (wood). Hence, it is a chemical change.

Hence the correct option is option (b).

Reason for incorrect options:

  • Option a) – The water boils.

    The boiling process only changes the water from the liquid to gas state without changing its chemical composition. The identity of the original substance has never lost. Hence, it is a physical change...

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Chemistry & Chemical Reactivity
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