Question

Classify each change as physical or chemical. (a) A balloon filled with hydrogen gas explodes upon contact with a spark. (b) The liquid propane in a barbecue evaporates away because someone left the valve open. (c) The liquid propane in a barbecue ignites upon contact with a spark. (d) Copper metal turns green on exposure to air and water.

Name: Problem 41, Chapter 3: Introductory Chemistry
Uploaded: 2020-08-25T21:39:50-08:00
Duration: 1 min 1 s
Channel: David Collins
Description: Classify each change as physical or chemical. (a) A balloon filled with hydrogen gas explodes upon contact with a spark. (b) The liquid propane in a barbecue evaporates away because someone left the valve open. (c) The liquid propane in a barbecue ignites upon contact with a spark. (d) Copper metal turns green on exposure to air and water.

   Classify each change as physical or chemical.
(a) A balloon filled with hydrogen gas explodes upon contact with a spark.
(b) The liquid propane in a barbecue evaporates away because someone left the valve open.
(c) The liquid propane in a barbecue ignites upon contact with a spark.
(d) Copper metal turns green on exposure to air and water.

Introductory Chemistry

Nivaldo J. Tro 5th Edition

Chapter 3, Problem 41

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Solved by Expert David Collins

08/25/2020

Step 1

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. This often involves changes that we can observe, such as color change, production of gas, or formation of a precipitate. Show more…

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Classify each change as physical or chemical. (a) A balloon filled with hydrogen gas explodes upon contact with a spark. (b) The liquid propane in a barbecue evaporates away because someone left the valve open. (c) The liquid propane in a barbecue ignites upon contact with a spark. (d) Copper metal turns green on exposure to air and water.

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Key Concepts

Physical Change

A physical change involves a change in the state or appearance of a substance without altering its chemical identity. This type of change is usually reversible and does not form any new substances. Examples of physical changes include phase transitions such as evaporation, melting, and freezing, where the molecular structure remains the same even though the form of the substance changes.

Chemical Change

A chemical change involves a transformation that results in the formation of one or more new substances with different chemical properties from the original material. These changes are typically not easily reversible and often involve energy changes such as the release or absorption of heat, light, or sound. Chemical reactions, such as combustion and oxidation, are common examples where the original substances undergo a change in their chemical composition, leading to new compounds.

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