Introductory Chemistry (5th Edition)

Published by Pearson
ISBN 10: 032191029X
ISBN 13: 978-0-32191-029-5

Chapter 3 - Matter and Energy - Exercises - Problems: 35

Answer

Helium is an element, hence it is a pure substance. Clean air is a homogeneous mixture of multiple individual gases.

Work Step by Step

In rocky road ice cream, the individual parts can be seen. In most concrete, rocks can be seen mixed into the final product. These would both be heterogenous as their constituents are visible.
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