Chemistry: Principles and Practice (3rd Edition)

Published by Cengage Learning
ISBN 10: 0534420125
ISBN 13: 978-0-53442-012-3

Chapter 1 - Introduction to Chemistry - Questions and Exercises - Exercises - Page 33: 1.32

Answer

(a) Meat cooks: Chemical as protein structure is disrupted irreversibly (b) A candle burns: Physical and chemical. Melting is a physical change, and burning of the wick is a chemical change as it burns to form CO2 and soot. (c) Wood is attached with nails: Physical change as no chemical reaction occurs (d) Newspaper yellows with age: Chemical as oxidization makes the paper yellow

Work Step by Step

(a) Meat cooks: Chemical as protein structure is disrupted irreversibly (b) A candle burns: Physical and chemical. Melting is a physical change, and burning of the wick is a chemical change as it burns to form CO2 and soot. (c) Wood is attached with nails: Physical change as no chemical reaction occurs (d) Newspaper yellows with age: Chemical as oxidization makes the paper yellow
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