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Chemistry & Chemical Reactivity

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

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Section
BuyFindarrow_forward

Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 1.3, Problem 1RC
Textbook Problem
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Which of the following is a pure substance?

  1. (a) dry ice (solid CO2)
  2. (b) 9 K gold
  3. (c) dry air
  4. (d) blood

Interpretation Introduction

Interpretation:  The pure substance of the given following to be identified.

Concept introduction:

Pure Substance: It can be defined as substances that are made of only one type of atom or molecule. Fixed composition and cannot be further purified.

Element: An element is consists of only one type of atom.

Compound: A compound consists of more than one type of atom, where the atoms are connected through chemical bonds and occur in a definite proportion by mass.

Explanation of Solution

Reason for correct option:

  1. a) Dry ice (SolidCO2) : The given substance dry ice contain only one type of molecule that is CO2 and has the fixed composition which cannot be purified as it is made up of one molecule type. Hence, the dry ice is a pure substance.

Hence the correct option is option (a).

Reason for incorrect options:

  1. b) 9KGold: It is basically an alloy of Gold where other elements such as silver, tin, nickel, palladium, etc

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Chapter 1 Solutions

Chemistry & Chemical Reactivity
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