A match is lit and held under a cold piece of metal. The...

Name: Problem 20, Chapter 1: Chemistry The Central Science
Uploaded: 2021-04-27T19:31:34-08:00
Duration: 1 min 58 s
Channel: Lottie Adams
Description: A match is lit and held under a cold piece of metal. The following observations are made: (a) The match burns. (b) The metal gets warmer. (c) Water condenses on the metal. (d) Soot (carbon) is deposited on the metal. Which of these occurrences are due to physical changes, and which are due to chemical changes?

A match is lit and held under a cold piece of metal. The following observations are made: (a) The match burns. (b) The metal gets warmer. (c) Water condenses on the metal. (d) Soot (carbon) is deposited on the metal. Which of these occurrences are due to physical changes, and which are due to chemical changes?

A match is lit and held under a cold piece of metal. The following observations are made: (a) The match burns.
(b) The metal gets warmer. (c) Water condenses on the metal.
(d) Soot (carbon) is deposited on the metal. Which of these occurrences are due to physical changes, and which are due to chemical changes?

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Key Concepts

Physical Changes

Physical changes involve alterations in a system that affect its state or form without changing its chemical identity. These include changes like temperature fluctuations, phase transitions such as water vapor condensing into liquid, and heat transfer where the material warms up, but the fundamental molecules remain unchanged.

Chemical Changes

Chemical changes occur when substances undergo reactions that create new chemical compounds, altering the original molecular structure. Examples include combustion, where a match’s organic material reacts with oxygen to produce different substances such as carbon dioxide, water vapor, and by-products like soot.

Combustion

Combustion is a chemical process that involves the rapid reaction of a fuel with oxygen, releasing energy in the form of heat and light. This reaction produces new substances, exemplified by the formation of carbon deposits (soot) and other by-products, making it a classic example of a chemical change.

Phase Change

A phase change is a physical process where a substance transitions between states of matter, such as from gas to liquid or vice versa, without altering its chemical composition. The condensation of water vapor to form liquid on the cold metal illustrates this concept, as it involves a shift in state driven by temperature differences.

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