Cosmetology · Basic Chemistry of Products

What is the difference between a physical change and a chemical change in a substance?

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Correct answer

A physical change alters form or appearance without forming a new substance; a chemical change forms a new substance

A There is no difference
B A physical change always forms a new substance
C A chemical change is always reversible
D A physical change alters form or appearance without forming a new substance; a chemical change forms a new substance

Why this is the answer

A physical change alters the form or appearance of a substance without creating a new chemical substance (for example, melting ice, or wetting and drying hair to temporarily change its shape). A chemical change produces one or more new substances with different properties (for example, the action of a permanent wave or haircolor, which permanently alters the hair's structure). Many cosmetology services rely on chemical changes. Distinguishing physical from chemical changes is a basic chemistry concept on the exam.

Source: Scientific Concepts — Physical vs Chemical Change

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About this topic: Basic Chemistry of Products

Basic chemistry of products covers matter, elements and compounds, pH and the pH scale, acids and alkalis, oxidation and reduction, and how these ideas explain what shampoos, colours and chemical services actually do to the hair. This is one of 9 Scientific Concepts questions on basic chemistry of products, each with a full explanation on a single study page.

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What is the difference between a physical change and a chemical change in a substance?

Why this is the answer

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About this topic: Basic Chemistry of Products

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