World of Chemistry, 3rd edition
World of Chemistry, 3rd edition
3rd Edition
ISBN: 9781133109655
Author: Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher: Brooks / Cole / Cengage Learning
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Chapter 2, Problem 1STP
Interpretation Introduction

Interpretation: Name of an element needs to be identified.

Concept Introduction: Practically all of the matter in environment consists of mixtures of different substance. For example, soil; it has many forms of components, air; it has mixture of many gases, etc.

Expert Solution & Answer
Check Mark

Answer to Problem 1STP

Correct answer: Option D. Helium is an element.

Explanation of Solution

Reason for correct option: A substance which is made entirely from one type of atom, called element. Helium is a chemical element because its atomic number is 2 and also, it has 2 protons in its nucleus. So, the correct answer is option D.

Conclusion

Reasons for incorrect options:

Option A: Air is a mixture because it consists of gases such as hydrogen, nitrogen, oxygen, etc. So, this is an incorrect option.

Option B: Water is a compound because it consists of hydrogen and oxygen. So, this is an incorrect option.

Option C: Salt is a common term which is used for NaCl,KCl or NaHCO3 . So, this is an incorrect option.

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What are CHNOPS? These Chemical Elements = 98% of Life | Biology | Biochemistry; Author: Socratica;https://www.youtube.com/watch?v=w90wFlR53VM;License: Standard YouTube License, CC-BY