Chapter 1: Problem 14

Classify each of the following as a physical change or a chemical change, and describe the evidence that suggests a change is taking place. a. cracking an egg b. using bleach to remove a stain from a shirt c. burning a candle d. melting butter in the sun

Short Answer

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a. Physical change: cracking an egg. b. Chemical change: using bleach to remove a stain from a shirt. c. Chemical change: burning a candle. d. Physical change: melting butter in the sun.

Step by step solution

Identifying Change in Cracking an Egg

Cracking an egg is a physical change. The egg's chemical composition doesn't change, the egg merely changes its form from being inside a shell to outside. There is no evidence supporting that a new substance has been formed.

Identifying Change in Using Bleach to Remove Stains

Using bleach to remove a stain from a shirt is a chemical change. The bleach reacts with the staining substance, breaking it down and changing its chemical structure. The disappearance of the stain on the shirt is evidence that a new substance has been formed.

Identifying Change in Burning a Candle

Burning a candle is a chemical change. In the process, wax reacts with oxygen, causing a flame and producing heat, light, water vapor, and carbon dioxide. The evidence of this chemical change includes the production of new substances (water vapor and carbon dioxide), as well as the release of both heat and light.

Identifying Change in Melting Butter in the Sun

Melting butter in the sun is a physical change. The butter simply changes from a solid state to a liquid state, without any new substances forming. The butter can be cooled back down, and it will return to its original form, confirming that the change is reversible, thus a physical change.

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Classify each of the following as a physical change or a chemical change, and describe the evidence that suggests a change is taking place. a. cracking an egg b. using bleach to remove a stain from a shirt c. burning a candle d. melting butter in the sun

Short Answer

Step by step solution

Identifying Change in Cracking an Egg

Identifying Change in Using Bleach to Remove Stains

Identifying Change in Burning a Candle

Identifying Change in Melting Butter in the Sun

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