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Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
ISBN: 9781305079373

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BuyFindarrow_forward

Chemistry: Principles and Reactions

8th Edition
William L. Masterton + 1 other
ISBN: 9781305079373
Textbook Problem

Classify each of the following as element, compound, or mixture.

(a) air

(b) iron

(c) soy sauce

(d) table salt

Interpretation Introduction

(a)

Interpretation:

The air should be classified as element, compound, or mixture.

Concept introduction:

  • A substance that is made up of completely one type of atom is said to be an element.
  • A pure substance that can be separated into other smaller substances by any means that is by chemical or physical is said to be a compound. When the bonded atoms are same then the substance is said to be a molecule whereas when the joined atoms are different then they are said to be compound.
  • Two or more substances combined in such a way that the identity of each substance remains unchanged that is they do not react with each other is said to be a mixture.
Answer

Mixture.

Explanation

The air contains several gases that are dioxygen, O2, dinitrogen, N2, and a small amount of carbon dioxide, CO2 and few other gases (some are inert gases). There are small concentrations of sulfur dioxide, SO2, and nitrogen oxide(s), NOx. All the gases retain their identity in the air hence; it is classified as a mixture.

Interpretation Introduction

(b)

Interpretation:

The iron should be classified as element, compound, or mixture.

Concept introduction:

  • A substance that is made up of completely one type of atom is said to be an element.
  • A pure substance that can be separated into other smaller substances by any means that is by chemical or physical is said to be a compound. When the bonded atoms are same then the substance is said to be a molecule whereas when the joined atoms are different then they are said to be compound.
  • Two or more substances combined in such a way that the identity of each substance remains unchanged that is they do not react with each other is said to be a mixture.
Answer

Element.

Explanation

The iron contains only one type of atom that is Fe and cannot be broken down into simpler substances by any chemical or physical means. Thus, iron is classified as an element. The iron can be characterized by its atomic number (number of protons), Z which is 26 for iron. Hence, iron is classified as an element.

Interpretation Introduction

(c)

Interpretation:

The soy sauce should be classified as element, compound, or mixture.

Concept introduction:

  • A substance that is made up of completely one type of atom is said to be an element.
  • A pure substance that can be separated into other smaller substances by any means that is by chemical or physical is said to be a compound. When the bonded atoms are same then the substance is said to be a molecule whereas when the joined atoms are different then they are said to be compound.
  • Two or more substances combined in such a way that the identity of each substance remains unchanged that is they do not react with each other is said to be a mixture.
Answer

Mixture.

Explanation

The soya sauce contains salt, spices, and several flavorings which are not chemically joined with each other and the elements are not present in definite proportions. The particles in soya sauce are consistent visually and mixed thoroughly. Thus, soya sauce is classified as a mixture.

Interpretation Introduction

(d)

Interpretation:

The table salt should be classified as element, compound, or mixture.

Concept introduction:

  • A substance that is made up of completely one type of atom is said to be an element.
  • A pure substance that can be separated into other smaller substances by any means that is by chemical or physical is said to be a compound. When the bonded atoms are same then the substance is said to be a molecule whereas when the joined atoms are different then they are said to be compound.
  • Two or more substances combined in such a way that the identity of each substance remains unchanged that is they do not react with each other is said to be a mixture.
Answer

Compound.

Explanation

The table salt contains sodium chloride, NaCl which can be separated into smaller substances by any means that is chemically or physically. The atoms in NaCl are ionically bonded to each other and is made up of two different elements that is sodium, Na and chlorine, Cl. Hence, table salt is classified as a compound.

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