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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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Chapter
Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

The photos below illustrate an experiment you can do yourself. Place 10 mL of water in an empty soda can, and heat the water to boiling. Using tongs or pliers, turn the can over in a pan of cold water, making sure the opening in the can is below the water level in the pan.

images

  1. (a) Describe what happens, and explain it in terms of the subject of this chapter.
  2. (b) Prepare a molecular level sketch of the situation inside the can before heating and after heating (but prior to inverting the can).

(a)

Interpretation Introduction

Interpretation: The change happens when a can having 10ml of water is boiled and then cooled by placing over a pan of cold water.

Concept Introduction:

Vapor pressure is nothing but the pressure of a vapor in contact with its liquid or solid form.

When a liquid and vapor are in equilibrium the pressure exerted by the vapor is called the equilibrium vapor pressure.

Explanation

Given that an empty can is filled with 10ml of water and heated to boiling. Then it is placed inverted over a pan of cold water such that the opening in the can is below the water level in the pan.

Initially the vapor pressure of water will be atmospheric pressure which is 760mm

(b)

Interpretation Introduction

A molecular level sketch of the situation inside the can before heating and after heating has to be drawn.

Concept Introduction:

Vapor pressure is nothing but the pressure of a vapor in contact with its liquid or solid form.

When a liquid and vapor are in equilibrium the pressure exerted by the vapor is called the equilibrium vapor pressure.

If intermolecular force is small the vapor pressure of the substance is high and the boiling point will be low.

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